TY - JOUR A1 - Lukoszek, Radoslaw A1 - Müller-Röber, Bernd A1 - Ignatova, Zoya T1 - Interplay between polymerase II- and polymerase III-assisted expression of overlapping genes JF - FEBS letters : the journal for rapid publication of short reports in molecular biosciences N2 - Up to 15% of the genes in different genomes overlap. This architecture, although beneficial for the genome size, represents an obstacle for simultaneous transcription of both genes. Here we analyze the interference between RNA-polymerase II (Pol II) and RNA-polymerase III (Pol III) when transcribing their target genes encoded on opposing strands within the same DNA fragment in Arabidopsis thaliana. The expression of a Pol II-dependent protein-coding gene negatively correlated with the transcription of a Pol III-dependent, tRNA-coding gene set. We suggest that the architecture of the overlapping genes introduces an additional layer of control of gene expression. (C) 2013 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved. KW - Gene expression KW - Transcription KW - tRNA KW - Nested and overlapping genes KW - Arabidopsis thaliana Y1 - 2013 U6 - https://doi.org/10.1016/j.febslet.2013.09.033 SN - 0014-5793 SN - 1873-3468 VL - 587 IS - 22 SP - 3692 EP - 3695 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Balazadeh, Salma A1 - Kwasniewski, Miroslaw A1 - Caldana, Camila A1 - Mehrnia, Mohammad A1 - Zanor, Maria Ines A1 - Xue, Gang-Ping A1 - Müller-Röber, Bernd T1 - ORS1, an H2O2-Responsive NAC Transcription Factor, Controls Senescence in Arabidopsis thaliana JF - Molecular plant N2 - We report here that ORS1, a previously uncharacterized member of the NAC transcription factor family, controls leaf senescence in Arabidopsis thaliana. Overexpression of ORS1 accelerates senescence in transgenic plants, whereas its inhibition delays it. Genes acting downstream of ORS1 were identified by global expression analysis using transgenic plants producing dexamethasone-inducible ORS1-GR fusion protein. Of the 42 up-regulated genes, 30 (similar to 70%) were previously shown to be up-regulated during age-dependent senescence. We also observed that 32 (similar to 76%) of the ORS1-dependent genes were induced by long-term (4 d), but not short-term (6 h) salinity stress (150 mM NaCl). Furthermore, expression of 16 and 24 genes, respectively, was induced after 1 and 5 h of treatment with hydrogen peroxide (H2O2), a reactive oxygen species known to accumulate during salinity stress. ORS1 itself was found to be rapidly and strongly induced by H2O2 treatment in both leaves and roots. Using in vitro binding site selection, we determined the preferred binding motif of ORS1 and found it to be present in half of the ORS1-dependent genes. ORS1 is a paralog of ORE1/ANAC092/AtNAC2, a previously reported regulator of leaf senescence. Phylogenetic footprinting revealed evolutionary conservation of the ORS1 and ORE1 promoter sequences in different Brassicaceae species, indicating strong positive selection acting on both genes. We conclude that ORS1, similarly to ORE1, triggers expression of senescence-associated genes through a regulatory network that may involve cross-talk with salt- and H2O2-dependent signaling pathways. KW - NAC transcription factor KW - leaf senescence KW - gene expression KW - gene regulatory network KW - hydrogen peroxide Y1 - 2011 U6 - https://doi.org/10.1093/mp/ssq080 SN - 1674-2052 VL - 4 IS - 2 SP - 346 EP - 360 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Balazadeh, Salma A1 - Jaspert, Nils A1 - Arif, Muhammad A1 - Müller-Röber, Bernd A1 - Maurino, Veronica G. T1 - Expression of ROS-responsive genes and transcription factors after metabolic formation of H2O2 in chloroplasts JF - Frontiers in plant science N2 - Glycolate oxidase (GO) catalyses the oxidation of glycolate to glyoxylate, thereby consuming O-2 and producing H2O2. In this work, Arabidopsis thaliana plants expressing GO in the chloroplasts (GO plants) were used to assess the expressional behavior of reactive oxygen species (ROS)-responsive genes and transcription factors (TFs) after metabolic induction of H2O2 formation in chloroplasts. In this organelle, GO uses the glycolate derived from the oxygenase activity of RubisCO. Here, to identify genes responding to an abrupt production of H2O2 in chloroplasts we used quantitative real-time PCR (qRT-PCR) to test the expression of 187 ROS-responsive genes and 1880 TFs after transferring GO and wild-type (WT) plants grown at high CO2 levels to ambient CO2 concentration. Our data revealed coordinated expression changes of genes of specific functional networks 0.5 h after metabolic induction of H2O2 production in GO plants, including the induction of indole glucosinolate and camalexin biosynthesis genes. Comparative analysis using available microarray data suggests that signals for the induction of these genes through H2O2 may originate in the chloroplast. The TF profiling indicated an up-regulation in GO plants of a group of genes involved in the regulation of proanthocyanidin and anthocyanin biosynthesis. Moreover, the upregulation of expression of IF and IF interacting proteins affecting development (e.g., cell division, stem branching, flowering time, flower development) would impact growth and reproductive capacity, resulting in altered development under conditions that promote the formation of H2O2. KW - glycolate oxidase KW - H2O2 KW - ROS-responsive genes KW - transcription factors Y1 - 2012 U6 - https://doi.org/10.3389/fpls.2012.00234 SN - 1664-462X VL - 3 PB - Frontiers Research Foundation CY - Lausanne ER - TY - JOUR A1 - Dortay, Hakan A1 - Akula, Usha Madhuri A1 - Westphal, Christin A1 - Sittig, Marie A1 - Müller-Röber, Bernd T1 - High-throughput protein expression using a combination of ligation-independent cloning (LIC) and infrared fluorescent protein (IFP) detection JF - PLoS one N2 - Protein expression in heterologous hosts for functional studies is a cumbersome effort. Here, we report a superior platform for parallel protein expression in vivo and in vitro. The platform combines highly efficient ligation-independent cloning (LIC) with instantaneous detection of expressed proteins through N- or C-terminal fusions to infrared fluorescent protein (IFP). For each open reading frame, only two PCR fragments are generated (with three PCR primers) and inserted by LIC into ten expression vectors suitable for protein expression in microbial hosts, including Escherichia coli, Kluyveromyces lactis, Pichia pastoris, the protozoon Leishmania tarentolae, and an in vitro transcription/translation system. Accumulation of IFP-fusion proteins is detected by infrared imaging of living cells or crude protein extracts directly after SDS-PAGE without additional processing. We successfully employed the LIC-IFP platform for in vivo and in vitro expression of ten plant and fungal proteins, including transcription factors and enzymes. Using the IFP reporter, we additionally established facile methods for the visualisation of protein-protein interactions and the detection of DNA-transcription factor interactions in microtiter and gel-free format. We conclude that IFP represents an excellent reporter for high-throughput protein expression and analysis, which can be easily extended to numerous other expression hosts using the setup reported here. Y1 - 2011 U6 - https://doi.org/10.1371/journal.pone.0018900 SN - 1932-6203 VL - 6 IS - 4 PB - PLoS CY - San Fransisco ER - TY - JOUR A1 - Parlitz, Steffi A1 - Kunze, Reinhard A1 - Müller-Röber, Bernd A1 - Balazadeh, Salma T1 - Regulation of photosynthesis and transcription factor expression by leaf shading and re-illumination in Arabidopsis thaliana leaves JF - Journal of plant physiology : biochemistry, physiology, molecular biology and biotechnology of plants N2 - Leaf senescence of annual plants is a genetically programmed developmental phase. The onset of leaf senescence is however not exclusively determined by tissue age but is modulated by various environmental factors. Shading of individual attached leaves evokes dark-induced senescence. The initiation and progression of dark-induced senescence depend on the plant and the age of the affected leaf, however. In several plant species dark-induced senescence is fully reversible upon re-illumination and the leaves can regreen, but the regreening ability depends on the duration of dark incubation. We studied the ability of Arabidopsis thaliana leaves to regreen after dark-incubation with the aim to identify transcription factors (TFs) that are involved in the regulation of early dark-induced senescence and regreening. Two days shading of individual attached leaves triggers the transition into a pre-senescence state from which the leaves can largely recover. Longer periods of darkness result in irreversible senescence. Large scale qRT-PCR analysis of 1872 TF genes revealed that 649 of them are regulated in leaves during normal development, upon shading or re-illumination. Leaf shading triggered upregulation of 150 TF genes, some of which are involved in controlling senescence. Of those, 39 TF genes were upregulated after two days in the dark and regained pre-shading expression level after two days of re-illumination. Furthermore, a larger number of 422 TF genes were down regulated upon shading. In TF gene clusters with different expression patterns certain TF families are over-represented. KW - Arabidopsis thaliana KW - Dark-induced senescence KW - Expression profiling KW - Regreening KW - Transcription factor Y1 - 2011 U6 - https://doi.org/10.1016/j.jplph.2011.02.001 SN - 0176-1617 VL - 168 IS - 12 SP - 1311 EP - 1319 PB - Elsevier CY - Jena ER - TY - JOUR A1 - Winck, Flavia Vischi A1 - Kwasniewski, Miroslaw A1 - Wienkoop, Stefanie A1 - Müller-Röber, Bernd T1 - An optimized method for the isolation of nuclei from chlamydomas Reinhardtii (Chlorophyceae) JF - Journal of phycology N2 - The cell nucleus harbors a large number of proteins involved in transcription, RNA processing, chromatin remodeling, nuclear signaling, and ribosome assembly. The nuclear genome of the model alga Chlamydomonas reinhardtii P. A. Dang. was recently sequenced, and many genes encoding nuclear proteins, including transcription factors and transcription regulators, have been identified through computational discovery tools. However, elucidating the specific biological roles of nuclear proteins will require support from biochemical and proteomics data. Cellular preparations with enriched nuclei are important to assist in such analyses. Here, we describe a simple protocol for the isolation of nuclei from Chlamydomonas, based on a commercially available kit. The modifications done in the original protocol mainly include alterations of the differential centrifugation parameters and detergent-based cell lysis. The nuclei-enriched fractions obtained with the optimized protocol show low contamination with mitochondrial and plastid proteins. The protocol can be concluded within only 3 h, and the proteins extracted can be used for gel-based and non-gel-based proteomic approaches. KW - 2D gel electrophoresis KW - algae KW - Chlamydomonas KW - nuclear proteins KW - nucleus KW - proteomics Y1 - 2011 U6 - https://doi.org/10.1111/j.1529-8817.2011.00967.x SN - 0022-3646 VL - 47 IS - 2 SP - 333 EP - 340 PB - Wiley-Blackwell CY - Malden ER - TY - JOUR A1 - Zhang, Gong A1 - Lukoszek, Radoslaw A1 - Müller-Röber, Bernd A1 - Ignatova, Zoya T1 - Different sequence signatures in the upstream regions of plant and animal tRNA genes shape distinct modes of regulation JF - Nucleic acids research N2 - In eukaryotes, the transcription of tRNA genes is initiated by the concerted action of transcription factors IIIC (TFIIIC) and IIIB (TFIIIB) which direct the recruitment of polymerase III. While TFIIIC recognizes highly conserved, intragenic promoter elements, TFIIIB binds to the non-coding 5'-upstream regions of the tRNA genes. Using a systematic bioinformatic analysis of 11 multicellular eukaryotic genomes we identified a highly conserved TATA motif followed by a CAA-motif in the tRNA upstream regions of all plant genomes. Strikingly, the 5'-flanking tRNA regions of the animal genomes are highly heterogeneous and lack a common conserved sequence signature. Interestingly, in the animal genomes the tRNA species that read the same codon share conserved motifs in their upstream regions. Deep-sequencing analysis of 16 human tissues revealed multiple splicing variants of two of the TFIIIB subunits, Bdp1 and Brf1, with tissue-specific expression patterns. These multiple forms most likely modulate the TFIIIB-DNA interactions and explain the lack of a uniform signature motif in the tRNA upstream regions of animal genomes. The anticodon-dependent 5'-flanking motifs provide a possible mechanism for independent regulation of the tRNA transcription in various human tissues. Y1 - 2011 U6 - https://doi.org/10.1093/nar/gkq1257 SN - 0305-1048 VL - 39 IS - 8 SP - 3331 EP - 3339 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Garapati, Prashanth A1 - Feil, Regina A1 - Lunn, John Edward A1 - Van Dijck, Patrick A1 - Balazadeh, Salma A1 - Müller-Röber, Bernd T1 - Transcription Factor Arabidopsis Activating Factor1 Integrates Carbon Starvation Responses with Trehalose Metabolism JF - Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants N2 - Plants respond to low carbon supply by massive reprogramming of the transcriptome and metabolome. We show here that the carbon starvation-induced NAC (for NO APICAL MERISTEM/ARABIDOPSIS TRANSCRIPTION ACTIVATION FACTOR/CUP-SHAPED COTYLEDON) transcription factor Arabidopsis (Arabidopsis thaliana) Transcription Activation Factor1 (ATAF1) plays an important role in this physiological process. We identified TREHALASE1, the only trehalase-encoding gene in Arabidopsis, as a direct downstream target of ATAF1. Overexpression of ATAF1 activates TREHALASE1 expression and leads to reduced trehalose-6-phosphate levels and a sugar starvation metabolome. In accordance with changes in expression of starch biosynthesis-and breakdown-related genes, starch levels are generally reduced in ATAF1 overexpressors but elevated in ataf1 knockout plants. At the global transcriptome level, genes affected by ATAF1 are broadly associated with energy and carbon starvation responses. Furthermore, transcriptional responses triggered by ATAF1 largely overlap with expression patterns observed in plants starved for carbon or energy supply. Collectively, our data highlight the existence of a positively acting feedforward loop between ATAF1 expression, which is induced by carbon starvation, and the depletion of cellular carbon/energy pools that is triggered by the transcriptional regulation of downstream gene regulatory networks by ATAF1. Y1 - 2015 U6 - https://doi.org/10.1104/pp.15.00917 SN - 0032-0889 SN - 1532-2548 VL - 169 IS - 1 SP - 379 EP - 390 PB - American Society of Plant Physiologists CY - Rockville ER - TY - INPR A1 - Müller-Röber, Bernd T1 - That "crispert" in Plant Cultivation T2 - Journal für Verbraucherschutz und Lebensmittelsicherheit = Journal of consumer protection and food safety Y1 - 2015 U6 - https://doi.org/10.1007/s00003-015-0985-1 SN - 1661-5751 SN - 1661-5867 VL - 10 IS - 4 SP - 305 EP - 306 PB - Springer CY - Basel ER - TY - JOUR A1 - Thirumalaikumar, Venkatesh P. A1 - Devkar, Vikas A1 - Mehterov, Nikolay A1 - Ali, Shawkat A1 - Ozgur, Rengin A1 - Turkan, Ismail A1 - Müller-Röber, Bernd A1 - Balazadeh, Salma T1 - NAC transcription factor JUNGBRUNNEN1 enhances drought tolerance in tomato JF - Plant Biotechnology Journal N2 - Water deficit (drought stress) massively restricts plant growth and the yield of crops; reducing the deleterious effects of drought is therefore of high agricultural relevance. Drought triggers diverse cellular processes including the inhibition of photosynthesis, the accumulation of cell-damaging reactive oxygen species and gene expression reprogramming, besides others. Transcription factors (TF) are central regulators of transcriptional reprogramming and expression of many TF genes is affected by drought, including members of the NAC family. Here, we identify the NAC factor JUNGBRUNNEN1 (JUB1) as a regulator of drought tolerance in tomato (Solanum lycopersicum). Expression of tomato JUB1 (SlJUB1) is enhanced by various abiotic stresses, including drought. Inhibiting SlJUB1 by virus-induced gene silencing drastically lowers drought tolerance concomitant with an increase in ion leakage, an elevation of hydrogen peroxide (H2O2) levels and a decrease in the expression of various drought-responsive genes. In contrast, overexpression of AtJUB1 from Arabidopsis thaliana increases drought tolerance in tomato, alongside with a higher relative leaf water content during drought and reduced H2O2 levels. AtJUB1 was previously shown to stimulate expression of DREB2A, a TF involved in drought responses, and of the DELLA genes GAI and RGL1. We show here that SlJUB1 similarly controls the expression of the tomato orthologs SlDREB1, SlDREB2 and SlDELLA. Furthermore, AtJUB1 directly binds to the promoters of SlDREB1, SlDREB2 and SlDELLA in tomato. Our study highlights JUB1 as a transcriptional regulator of drought tolerance and suggests considerable conservation of the abiotic stress-related gene regulatory networks controlled by this NAC factor between Arabidopsis and tomato. KW - Arabidopsis KW - tomato KW - transcription factor KW - drought KW - reactive oxygen species KW - DELLA Y1 - 2017 U6 - https://doi.org/10.1111/pbi.12776 SN - 1467-7644 SN - 1467-7652 VL - 16 IS - 2 SP - 354 EP - 366 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Omidbakhshfard, Mohammad Amin A1 - Winck, Flavia Vischi A1 - Arvidsson, Samuel Janne A1 - Riano-Pachon, Diego M. A1 - Müller-Röber, Bernd T1 - A step-by-step protocol for formaldehyde-assisted isolation of regulatory elements from Arabidopsis thaliana JF - Journal of integrative plant biology N2 - The control of gene expression by transcriptional regulators and other types of functionally relevant DNA transactions such as chromatin remodeling and replication underlie a vast spectrum of biological processes in all organisms. DNA transactions require the controlled interaction of proteins with DNA sequence motifs which are often located in nucleosome-depleted regions (NDRs) of the chromatin. Formaldehyde-assisted isolation of regulatory elements (FAIRE) has been established as an easy-to-implement method for the isolation of NDRs from a number of eukaryotic organisms, and it has been successfully employed for the discovery of new regulatory segments in genomic DNA from, for example, yeast, Drosophila, and humans. Until today, however, FAIRE has only rarely been employed in plant research and currently no detailed FAIRE protocol for plants has been published. Here, we provide a step-by-step FAIRE protocol for NDR discovery in Arabidopsis thaliana. We demonstrate that NDRs isolated from plant chromatin are readily amenable to quantitative polymerase chain reaction and next-generation sequencing. Only minor modification of the FAIRE protocol will be needed to adapt it to other plants, thus facilitating the global inventory of regulatory regions across species. KW - Arabidopsis thaliana KW - chromatin KW - cis-regulatory elements KW - epigenomics KW - FAIRE-qPCR KW - FAIRE-seq KW - gene expression KW - gene regulatory network KW - transcription factor Y1 - 2014 U6 - https://doi.org/10.1111/jipb.12151 SN - 1672-9072 SN - 1744-7909 VL - 56 IS - 6 SP - 527 EP - 538 PB - Wiley-Blackwell CY - Hoboken ER - TY - GEN A1 - Gupta, Saurabh A1 - Dong, Yanni A1 - Dijkwel, Paul P. A1 - Müller-Röber, Bernd A1 - Gechev, Tsanko S. T1 - Genome-Wide Analysis of ROS Antioxidant Genes in Resurrection Species Suggest an Involvement of Distinct ROS Detoxification Systems during Desiccation T2 - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe N2 - Abiotic stress is one of the major threats to plant crop yield and productivity. When plants are exposed to stress, production of reactive oxygen species (ROS) increases, which could lead to extensive cellular damage and hence crop loss. During evolution, plants have acquired antioxidant defense systems which can not only detoxify ROS but also adjust ROS levels required for proper cell signaling. Ascorbate peroxidase (APX), glutathione peroxidase (GPX), catalase (CAT) and superoxide dismutase (SOD) are crucial enzymes involved in ROS detoxification. In this study, 40 putative APX, 28 GPX, 16 CAT, and 41 SOD genes were identified from genomes of the resurrection species Boea hygrometrica, Selaginella lepidophylla, Xerophyta viscosa, and Oropetium thomaeum, and the mesophile Selaginella moellendorffi. Phylogenetic analyses classified the APX, GPX, and SOD proteins into five clades each, and CAT proteins into three clades. Using co-expression network analysis, various regulatory modules were discovered, mainly involving glutathione, that likely work together to maintain ROS homeostasis upon desiccation stress in resurrection species. These regulatory modules also support the existence of species-specific ROS detoxification systems. The results suggest molecular pathways that regulate ROS in resurrection species and the role of APX, GPX, CAT and SOD genes in resurrection species during stress. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 763 KW - abiotic stress KW - desiccation KW - resurrection plants KW - ROS KW - ascorbate peroxidase KW - glutathione peroxidase KW - catalase KW - superoxide dismutase Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-437299 SN - 1866-8372 IS - 763 ER - TY - JOUR A1 - Gupta, Saurabh A1 - Dong, Yanni A1 - Dijkwel, Paul P. A1 - Müller-Röber, Bernd A1 - Gechev, Tsanko S. T1 - Genome-Wide Analysis of ROS Antioxidant Genes in Resurrection Species Suggest an Involvement of Distinct ROS Detoxification Systems during Desiccation JF - International Journal of Molecular Sciences N2 - Abiotic stress is one of the major threats to plant crop yield and productivity. When plants are exposed to stress, production of reactive oxygen species (ROS) increases, which could lead to extensive cellular damage and hence crop loss. During evolution, plants have acquired antioxidant defense systems which can not only detoxify ROS but also adjust ROS levels required for proper cell signaling. Ascorbate peroxidase (APX), glutathione peroxidase (GPX), catalase (CAT) and superoxide dismutase (SOD) are crucial enzymes involved in ROS detoxification. In this study, 40 putative APX, 28 GPX, 16 CAT, and 41 SOD genes were identified from genomes of the resurrection species Boea hygrometrica, Selaginella lepidophylla, Xerophyta viscosa, and Oropetium thomaeum, and the mesophile Selaginella moellendorffi. Phylogenetic analyses classified the APX, GPX, and SOD proteins into five clades each, and CAT proteins into three clades. Using co-expression network analysis, various regulatory modules were discovered, mainly involving glutathione, that likely work together to maintain ROS homeostasis upon desiccation stress in resurrection species. These regulatory modules also support the existence of species-specific ROS detoxification systems. The results suggest molecular pathways that regulate ROS in resurrection species and the role of APX, GPX, CAT and SOD genes in resurrection species during stress. KW - abiotic stress KW - desiccation KW - resurrection plants KW - ROS KW - ascorbate peroxidase KW - glutathione peroxidase KW - catalase KW - superoxide dismutase Y1 - 2019 U6 - https://doi.org/10.3390/ijms20123101 SN - 1422-0067 SN - 1661-6596 VL - 20 IS - 12 PB - Molecular Diversity Preservation International CY - Basel ER - TY - JOUR A1 - Hochrein, Lena A1 - Mitchell, Leslie A. A1 - Schulz, Karina A1 - Messerschmidt, Katrin A1 - Müller-Röber, Bernd T1 - L-SCRaMbLE as a tool for light-controlled Cre-mediated recombination in yeast JF - Nature Communications N2 - The synthetic yeast genome constructed by the International Synthetic Yeast Sc2.0 consortium adds thousands of loxPsym recombination sites to all 16 redesigned chromosomes, allowing the shuffling of Sc2.0 chromosome parts by the Cre-loxP recombination system thereby enabling genome evolution experiments. Here, we present L-SCRaMbLE, a lightcontrolled Cre recombinase for use in the yeast Saccharomyces cerevisiae. L-SCRaMbLE allows tight regulation of recombinase activity with up to 179-fold induction upon exposure to red light. The extent of recombination depends on induction time and concentration of the chromophore phycocyanobilin (PCB), which can be easily adjusted. The tool presented here provides improved recombination control over the previously reported estradiol-dependent SCRaMbLE induction system, mediating a larger variety of possible recombination events in SCRaMbLE-ing a reporter plasmid. Thereby, L-SCRaMbLE boosts the potential for further customization and provides a facile application for use in the S. cerevisiae genome reengineering project Sc2.0 or in other recombination-based systems. Y1 - 2018 U6 - https://doi.org/10.1038/s41467-017-02208-6 SN - 2041-1723 VL - 9 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Zech, Christina A1 - Stein, Monika A1 - Haberer, Anke A1 - Böhne, Alexander A1 - Müller-Röber, Bernd A1 - Heinig, Angela A1 - Raehse, Sebastian T1 - Portal = Existenzgründung: Ein Sprung ins kalte Wasser BT - Die Potsdamer Universitätszeitung N2 - Aus dem Inhalt: Existenzgründung: Ein Sprung ins kalte Wasser -Bernd Walz über Wettbewerbsfähigkeit und Nachwuchsförderung -Gertrud Lehnert über Mode bei Marcel Proust -Juniorprofessor Jens Eisert über Quanteninformation T3 - Portal: Das Potsdamer Universitätsmagazin - 03-04/2003 Y1 - 2003 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-501536 SN - 1618-6893 VL - 2003 ER - TY - GEN A1 - Petrov, Veselin A1 - Hille, Jacques A1 - Müller-Röber, Bernd A1 - Gechev, Tsanko S. T1 - ROS-mediated abiotic stress-induced programmed cell death in plants T2 - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe N2 - During the course of their ontogenesis plants are continuously exposed to a large variety of abiotic stress factors which can damage tissues and jeopardize the survival of the organism unless properly countered. While animals can simply escape and thus evade stressors, plants as sessile organisms have developed complex strategies to withstand them. When the intensity of a detrimental factor is high, one of the defense programs employed by plants is the induction of programmed cell death (PCD). This is an active, genetically controlled process which is initiated to isolate and remove damaged tissues thereby ensuring the survival of the organism. The mechanism of PCD induction usually includes an increase in the levels of reactive oxygen species (ROS) which are utilized as mediators of the stress signal. Abiotic stress-induced PCD is not only a process of fundamental biological importance, but also of considerable interest to agricultural practice as it has the potential to significantly influence crop yield. Therefore, numerous scientific enterprises have focused on elucidating the mechanisms leading to and controlling PCD in response to adverse conditions in plants. This knowledge may help develop novel strategies to obtain more resilient crop varieties with improved tolerance and enhanced productivity. The aim of the present review is to summarize the recent advances in research on ROS-induced PCD related to abiotic stress and the role of the organelles in the process. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 425 KW - abiotic stress KW - programmed cell death KW - reactive oxygen species KW - signal transduction KW - stress adaptation Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-406481 IS - 425 ER - TY - JOUR A1 - Schmidt, Romy A1 - Schippers, Jos H. M. A1 - Mieulet, Delphine A1 - Watanabe, Mutsumi A1 - Hoefgen, Rainer A1 - Guiderdoni, Emmanuel A1 - Müller-Röber, Bernd T1 - Salt-Rresponsive ERF1 is a negative regulator of grain filling and gibberellin-mediated seedling establishment in rice JF - Molecular plant N2 - Grain quality is an important agricultural trait that is mainly determined by grain size and composition. Here, we characterize the role of the rice transcription factor (TF) SALT-RESPONSIVE ERF1 (SERF1) during grain development. Through genome-wide expression profiling and chromatin immunoprecipitation, we found that SERF1 directly regulates RICE PROLAMIN-BOX BINDING FACTOR (RPBF), a TF that functions as a positive regulator of grain filling. Loss of SERF1 enhances RPBF expression resulting in larger grains with increased starch content, while SERF1 overexpression represses RPBF resulting in smaller grains. Consistently, during grain filling, starch biosynthesis genes such as GRANULE-BOUND STARCH SYNTHASEI (GBSSI), STARCH SYNTHASEI (SSI), SSIIIa, and ADP-GLUCOSE PYROPHOSPHORYLASE LARGE SUBUNIT2 (AGPL2) are up-regulated in SERF1 knockout grains. Moreover, SERF1 is a direct upstream regulator of GBSSI. In addition, SERF1 negatively regulates germination by controlling RPBF expression, which mediates the gibberellic acid (GA)-induced expression of RICE AMYLASE1A (RAmy1A). Loss of SERF1 results in more rapid seedling establishment, while SERF1 overexpression has the opposite effect. Our study reveals that SERF1 represents a negative regulator of grain filling and seedling establishment by timing the expression of RPBF. KW - RPBF KW - rice KW - grain filling KW - germination KW - SERF1 KW - gibberellic acid Y1 - 2014 U6 - https://doi.org/10.1093/mp/sst131 SN - 1674-2052 SN - 1752-9867 VL - 7 IS - 2 SP - 404 EP - 421 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Becker, Dirk A1 - Geiger, D. A1 - Dunkel, M. A1 - Roller, A. A1 - Bertl, Adam A1 - Latz, A. A1 - Carpaneto, Armando A1 - Dietrich, Peter A1 - Roelfsema, M. R. G. A1 - Voelker, C. A1 - Schmidt, D. A1 - Müller-Röber, Bernd A1 - Czempinski, Katrin A1 - Hedrich, R. T1 - AtTPK4, an Arabidopsis tandem-pore K+ channel, poised to control the pollen membrane voltage in a pH- and Ca2+- dependent manner N2 - The Arabidopsis tandem-pore K+ (TPK) channels displaying four transmembrane domains and two pore regions share structural homologies with their animal counterparts of the KCNK family. In contrast to the Shaker-like Arabidopsis channels (six transmembrane domains/one pore region), the functional properties and the biological role of plant TPK channels have not been elucidated yet. Here, we show that AtTPK4 (KCO4) localizes to the plasma membrane and is predominantly expressed in pollen. AtTPK4 (KCO4) resembles the electrical properties of a voltage-independent K+ channel after expression in Xenopus oocytes and yeast. Hyperpolarizing as well as depolarizing membrane voltages elicited instantaneous K+ currents, which were blocked by extracellular calcium and cytoplasmic protons. Functional complementation assays using a K+ transport-deficient yeast confirmed the biophysical and pharmacological properties of the AtTPK4 channel. The features of AtTPK4 point toward a role in potassium homeostasis and membrane voltage control of the growing pollen tube. Thus, AtTPK4 represents a member of plant tandem-pore-K+ channels, resembling the characteristics of its animal counterparts as well as plant-specific features with respect to modulation of channel activity by acidosis and calcium Y1 - 2004 SN - 0027-8424 ER - TY - GEN A1 - Balazadeh, Salma A1 - Müller-Röber, Bernd T1 - A balance to death T2 - Nature plants N2 - Leaf senescence plays a crucial role in nutrient recovery in late-stage plant development and requires vast transcriptional reprogramming by transcription factors such as ORESARA1 (ORE1). A proteolytic mechanism is now found to control ORE1 degradation, and thus senescence, during nitrogen starvation. Y1 - 2018 U6 - https://doi.org/10.1038/s41477-018-0279-6 SN - 2055-026X SN - 2055-0278 VL - 4 IS - 11 SP - 863 EP - 864 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Müller-Röber, Bernd A1 - Zimmermann, Matthias A1 - Eckardt, Barbara A1 - Jäger, Heidi A1 - Kampe, Heike A1 - Horn-Conrad, Antje A1 - Jäger, Sophie T1 - Portal Wissen = Paths BT - The Research Magazine of the University of Potsdam N2 - How traits are inherited from one generation to the next, how mutations change genetic information and consequently contribute to the development of new characteristics and emergence of new species – all these are exciting biological questions. Over millions of years, genetic differentiation has brought about an incredible diversity of species. Evolution has followed many different paths. It has led to an awesome natural biodiversity – to organisms that have adapted to very different environments and are sometimes oddly shaped or behave strangely. Humanmade biodiversity is stunning, too. Just think of the 10,000 rose varieties whose beauty delights, or the myriad wheat, barley, and corn variations; plants that had all once been plain grasses feed us today. We humans create our own biodiversity unknown to nature. And it is serving us well. Thanks to genome research we are now able to read the complete genetic information of organisms within a few hours or days. It takes much longer, however, to functionally map the many genomic sequences. Researchers achieve this through various methods: Activating or deactivating genes systematically, modifying their code, and exchanging genetic information between organisms have become standard procedures worldwide. The path to knowledge is often intricate, though. Elaborate experimental approaches are often necessary to gain insight into biological processes. Methods of genomic research enable us to investigate not only what is “out there” in nature, but also to ask, “How does a living organism, like a moss, react when sent to the International Space Station (ISS)? Can we gain knowledge about the adaptation strategies of living beings in harsh environmental conditions or even for colonizing the Moon or Mars?” Can we use synthetic biology to precisely alter microorganisms, planned on a drawing board so to speak, to create new options for treating diseases or for making innovative biology-based products? The answer to both questions is a resounding Yes! (Although moving to other planets is not on our present agenda.) Human land use determines biodiversity. On the other hand, organisms influence the formation of landscapes and, sooner or later, the composition of our atmosphere. This also leads to exciting scientific questions. Researchers have to strike new paths to reach new conclusions. Paths often cross other paths. A few years ago it was still unforeseeable that ecological research would substantially benefit from fast DNA sequencing methods. Genome researchers could hardly assume that the same techniques would lead to new possibilities for examining the highly complex cellular regulation and optimizing biotechnological processes. You will find examples of the multi-faceted research in biology as well as other very interesting articles in the latest edition of Portal Wissen. I wish you an enjoyable read! Prof. Dr. Bernd Müller-Röber Professor of Molecular Biology T3 - Portal Wissen: The research magazine of the University of Potsdam [Englische Ausgabe] - 01/2015 Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-441506 SN - 2198-9974 IS - 01/2015 ER - TY - JOUR A1 - John, Sheeba A1 - Olas, Justyna Jadwiga A1 - Müller-Röber, Bernd T1 - Regulation of alternative splicing in response to temperature variation in plants JF - Journal of experimental botany N2 - Plants have evolved numerous molecular strategies to cope with perturbations in environmental temperature, and to adjust growth and physiology to limit the negative effects of extreme temperature. One of the strategies involves alternative splicing of primary transcripts to encode alternative protein products or transcript variants destined for degradation by nonsense-mediated decay. Here, we review how changes in environmental temperature-cold, heat, and moderate alterations in temperature-affect alternative splicing in plants, including crops. We present examples of the mode of action of various temperature-induced splice variants and discuss how these alternative splicing events enable favourable plant responses to altered temperatures. Finally, we point out unanswered questions that should be addressed to fully utilize the endogenous mechanisms in plants to adjust their growth to environmental temperature. We also indicate how this knowledge might be used to enhance crop productivity in the future. KW - alternative splicing KW - ambient temperature KW - cold KW - heat KW - plants KW - stress KW - adaptation Y1 - 2021 U6 - https://doi.org/10.1093/jxb/erab232 SN - 0022-0957 SN - 1460-2431 VL - 72 IS - 18 SP - 6150 EP - 6163 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Ralevski, Alexandra A1 - Apelt, Federico A1 - Olas, Justyna Jadwiga A1 - Müller-Röber, Bernd A1 - Rugarli, Elena I. A1 - Kragler, Friedrich A1 - Horvath, Tamas L. T1 - Plant mitochondrial FMT and its mammalian homolog CLUH controls development and behavior in Arabidopsis and locomotion in mice JF - Cellular and molecular life sciences N2 - Mitochondria in animals are associated with development, as well as physiological and pathological behaviors. Several conserved mitochondrial genes exist between plants and higher eukaryotes. Yet, the similarities in mitochondrial function between plant and animal species is poorly understood. Here, we show that FMT (FRIENDLY MITOCHONDRIA) from Arabidopsis thaliana, a highly conserved homolog of the mammalian CLUH (CLUSTERED MITOCHONDRIA) gene family encoding mitochondrial proteins associated with developmental alterations and adult physiological and pathological behaviors, affects whole plant morphology and development under both stressed and normal growth conditions. FMT was found to regulate mitochondrial morphology and dynamics, germination, and flowering time. It also affects leaf expansion growth, salt stress responses and hyponastic behavior, including changes in speed of hyponastic movements. Strikingly, Cluh(+/-) heterozygous knockout mice also displayed altered locomotive movements, traveling for shorter distances and had slower average and maximum speeds in the open field test. These observations indicate that homologous mitochondrial genes may play similar roles and affect homologous functions in both plants and animals. KW - Arabidopsis thaliana KW - Mitochondria KW - FMT KW - Hyponasty KW - Mice KW - CLUH; KW - Locomotion Y1 - 2022 U6 - https://doi.org/10.1007/s00018-022-04382-3 SN - 1420-682X SN - 1420-9071 VL - 79 IS - 6 PB - Springer International Publishing AG CY - Cham (ZG) ER - TY - CHAP A1 - Kurbel, Karl A1 - Nowak, Dawid A1 - Azodi, Amir A1 - Jaeger, David A1 - Meinel, Christoph A1 - Cheng, Feng A1 - Sapegin, Andrey A1 - Gawron, Marian A1 - Morelli, Frank A1 - Stahl, Lukas A1 - Kerl, Stefan A1 - Janz, Mariska A1 - Hadaya, Abdulmasih A1 - Ivanov, Ivaylo A1 - Wiese, Lena A1 - Neves, Mariana A1 - Schapranow, Matthieu-Patrick A1 - Fähnrich, Cindy A1 - Feinbube, Frank A1 - Eberhardt, Felix A1 - Hagen, Wieland A1 - Plauth, Max A1 - Herscheid, Lena A1 - Polze, Andreas A1 - Barkowsky, Matthias A1 - Dinger, Henriette A1 - Faber, Lukas A1 - Montenegro, Felix A1 - Czachórski, Tadeusz A1 - Nycz, Monika A1 - Nycz, Tomasz A1 - Baader, Galina A1 - Besner, Veronika A1 - Hecht, Sonja A1 - Schermann, Michael A1 - Krcmar, Helmut A1 - Wiradarma, Timur Pratama A1 - Hentschel, Christian A1 - Sack, Harald A1 - Abramowicz, Witold A1 - Sokolowska, Wioletta A1 - Hossa, Tymoteusz A1 - Opalka, Jakub A1 - Fabisz, Karol A1 - Kubaczyk, Mateusz A1 - Cmil, Milena A1 - Meng, Tianhui A1 - Dadashnia, Sharam A1 - Niesen, Tim A1 - Fettke, Peter A1 - Loos, Peter A1 - Perscheid, Cindy A1 - Schwarz, Christian A1 - Schmidt, Christopher A1 - Scholz, Matthias A1 - Bock, Nikolai A1 - Piller, Gunther A1 - Böhm, Klaus A1 - Norkus, Oliver A1 - Clark, Brian A1 - Friedrich, Björn A1 - Izadpanah, Babak A1 - Merkel, Florian A1 - Schweer, Ilias A1 - Zimak, Alexander A1 - Sauer, Jürgen A1 - Fabian, Benjamin A1 - Tilch, Georg A1 - Müller, David A1 - Plöger, Sabrina A1 - Friedrich, Christoph M. A1 - Engels, Christoph A1 - Amirkhanyan, Aragats A1 - van der Walt, Estée A1 - Eloff, J. H. P. A1 - Scheuermann, Bernd A1 - Weinknecht, Elisa ED - Meinel, Christoph ED - Polze, Andreas ED - Oswald, Gerhard ED - Strotmann, Rolf ED - Seibold, Ulrich ED - Schulzki, Bernhard T1 - HPI Future SOC Lab BT - Proceedings 2015 N2 - Das Future SOC Lab am HPI ist eine Kooperation des Hasso-Plattner-Instituts mit verschiedenen Industriepartnern. Seine Aufgabe ist die Ermöglichung und Förderung des Austausches zwischen Forschungsgemeinschaft und Industrie. Am Lab wird interessierten Wissenschaftlern eine Infrastruktur von neuester Hard- und Software kostenfrei für Forschungszwecke zur Verfügung gestellt. Dazu zählen teilweise noch nicht am Markt verfügbare Technologien, die im normalen Hochschulbereich in der Regel nicht zu finanzieren wären, bspw. Server mit bis zu 64 Cores und 2 TB Hauptspeicher. Diese Angebote richten sich insbesondere an Wissenschaftler in den Gebieten Informatik und Wirtschaftsinformatik. Einige der Schwerpunkte sind Cloud Computing, Parallelisierung und In-Memory Technologien. In diesem Technischen Bericht werden die Ergebnisse der Forschungsprojekte des Jahres 2015 vorgestellt. Ausgewählte Projekte stellten ihre Ergebnisse am 15. April 2015 und 4. November 2015 im Rahmen der Future SOC Lab Tag Veranstaltungen vor. KW - Future SOC Lab KW - Forschungsprojekte KW - Multicore Architekturen KW - In-Memory Technologie KW - Cloud Computing KW - maschinelles Lernen KW - künstliche Intelligenz Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-102516 ER - TY - JOUR A1 - Fichtner, Franziska A1 - Barbier, Francois F. A1 - Annunziata, Maria Grazia A1 - Feil, Regina A1 - Olas, Justyna Jadwiga A1 - Müller-Röber, Bernd A1 - Stitt, Mark A1 - Beveridge, Christine A. A1 - Lunn, John Edward T1 - Regulation of shoot branching in arabidopsis by trehalose 6-phosphate JF - New phytologist : international journal of plant science N2 - Trehalose 6-phosphate (Tre6P) is a sucrose signalling metabolite that has been implicated in regulation of shoot branching, but its precise role is not understood. We expressed tagged forms of TREHALOSE-6-PHOSPHATE SYNTHASE1 (TPS1) to determine where Tre6P is synthesized in arabidopsis (Arabidopsis thaliana), and investigated the impact of localized changes in Tre6P levels, in axillary buds or vascular tissues, on shoot branching in wild-type and branching mutant backgrounds. TPS1 is expressed in axillary buds and the subtending vasculature, as well as in the leaf and stem vasculature. Expression of a heterologous Tre6P phosphatase (TPP) to lower Tre6P in axillary buds strongly delayed bud outgrowth in long days and inhibited branching in short days. TPP expression in the vasculature also delayed lateral bud outgrowth and decreased branching. Increased Tre6P in the vasculature enhanced branching and was accompanied by higher expression of FLOWERING LOCUS T (FT) and upregulation of sucrose transporters. Increased vascular Tre6P levels enhanced branching in branched1 but not in ft mutant backgrounds. These results provide direct genetic evidence of a local role for Tre6P in regulation of axillary bud outgrowth within the buds themselves, and also connect Tre6P with systemic regulation of shoot branching via FT. KW - Arabidopsis thaliana (arabidopsis) KW - axillary bud KW - branching KW - sucrose KW - sugar signalling KW - trehalose 6‐ phosphate (Tre6P) Y1 - 2020 U6 - https://doi.org/10.1111/nph.17006 SN - 0028-646X SN - 1469-8137 VL - 229 IS - 4 SP - 2135 EP - 2151 PB - Wiley CY - Hoboken ER - TY - GEN A1 - Fichtner, Franziska A1 - Barbier, Francois F. A1 - Annunziata, Maria Grazia A1 - Feil, Regina A1 - Olas, Justyna Jadwiga A1 - Müller-Röber, Bernd A1 - Stitt, Mark A1 - Beveridge, Christine A. A1 - Lunn, John Edward T1 - Regulation of shoot branching in arabidopsis by trehalose 6-phosphate T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - Trehalose 6-phosphate (Tre6P) is a sucrose signalling metabolite that has been implicated in regulation of shoot branching, but its precise role is not understood. We expressed tagged forms of TREHALOSE-6-PHOSPHATE SYNTHASE1 (TPS1) to determine where Tre6P is synthesized in arabidopsis (Arabidopsis thaliana), and investigated the impact of localized changes in Tre6P levels, in axillary buds or vascular tissues, on shoot branching in wild-type and branching mutant backgrounds. TPS1 is expressed in axillary buds and the subtending vasculature, as well as in the leaf and stem vasculature. Expression of a heterologous Tre6P phosphatase (TPP) to lower Tre6P in axillary buds strongly delayed bud outgrowth in long days and inhibited branching in short days. TPP expression in the vasculature also delayed lateral bud outgrowth and decreased branching. Increased Tre6P in the vasculature enhanced branching and was accompanied by higher expression of FLOWERING LOCUS T (FT) and upregulation of sucrose transporters. Increased vascular Tre6P levels enhanced branching in branched1 but not in ft mutant backgrounds. These results provide direct genetic evidence of a local role for Tre6P in regulation of axillary bud outgrowth within the buds themselves, and also connect Tre6P with systemic regulation of shoot branching via FT. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1383 KW - Arabidopsis thaliana (arabidopsis) KW - axillary bud KW - branching KW - sucrose KW - sugar signalling KW - trehalose 6‐ phosphate (Tre6P) Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-569564 SN - 1866-8372 IS - 4 ER - TY - JOUR A1 - Volk, Benno A1 - Markert, Doreen A1 - Riejok, Henriette A1 - Dittberner, Jürgen A1 - Wanka, Johanna A1 - Wilkens, Martin A1 - Görtemaker, Manfred A1 - Regierer, Babette A1 - Steup, Martin A1 - Müller-Röber, Bernd A1 - Wernicke, Matthias A1 - Altenberger, Uwe A1 - Stölting, Erhard A1 - Ferý, Carolin A1 - Egenter, Peter A1 - Lenz, Claudia A1 - Jakubowski, Zuzanna A1 - Klötzer, Sylvia A1 - Krause, Michael A1 - Dietsch, Ulrich T1 - Portal = Vor der Präsidenten-Wahl: Erwartungen, Wünsche, Vorschläge BT - Die Potsdamer Universitätszeitung N2 - Aus dem Inhalt: - Vor der Präsidenten-Wahl: Erwartungen, Wünsche, Vorschläge - Der AStA in der Krise? - Über Satire und Macht in der DDR - Vom Fünf-Sterne-Koch zum Mensaleiter T3 - Portal: Das Potsdamer Universitätsmagazin - 04-05/2006 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-440005 SN - 1618-6893 IS - 04-05/2006 ER - TY - JOUR A1 - Mani, Deepak A1 - Kupsch, Andreas A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Diffraction Enhanced Imaging Analysis with Pseudo-Voigt Fit Function JF - Journal of imaging : open access journal N2 - Diffraction enhanced imaging (DEI) is an advanced digital radiographic imaging technique employing the refraction of X-rays to contrast internal interfaces. This study aims to qualitatively and quantitatively evaluate images acquired using this technique and to assess how different fitting functions to the typical rocking curves (RCs) influence the quality of the images. RCs are obtained for every image pixel. This allows the separate determination of the absorption and the refraction properties of the material in a position-sensitive manner. Comparison of various types of fitting functions reveals that the Pseudo-Voigt (PsdV) function is best suited to fit typical RCs. A robust algorithm was developed in the Python programming language, which reliably extracts the physically meaningful information from each pixel of the image. We demonstrate the potential of the algorithm with two specimens: a silicone gel specimen that has well-defined interfaces, and an additively manufactured polycarbonate specimen. KW - diffraction enhanced imaging KW - analyzer-based imaging KW - X-ray refraction; KW - non-destructive evaluation KW - Pseudo-Voigt fit function KW - Python Y1 - 2022 U6 - https://doi.org/10.3390/jimaging8080206 SN - 2313-433X VL - 8 IS - 8 PB - MDPI CY - Basel ER - TY - JOUR A1 - Christakoudi, Sofa A1 - Tsilidis, Konstantinos K. A1 - Muller, David C. A1 - Freisling, Heinz A1 - Weiderpass, Elisabete A1 - Overvad, Kim A1 - Söderberg, Stefan A1 - Häggström, Christel A1 - Pischon, Tobias A1 - Dahm, Christina C. A1 - Zhang, Jie A1 - Tjønneland, Anne A1 - Schulze, Matthias Bernd T1 - A Body Shape Index (ABSI) achieves better mortality risk stratification than alternative indices of abdominal obesity: results from a large European cohort JF - Scientific Reports N2 - Abdominal and general adiposity are independently associated with mortality, but there is no consensus on how best to assess abdominal adiposity. We compared the ability of alternative waist indices to complement body mass index (BMI) when assessing all-cause mortality. We used data from 352,985 participants in the European Prospective Investigation into Cancer and Nutrition (EPIC) and Cox proportional hazards models adjusted for other risk factors. During a mean follow-up of 16.1 years, 38,178 participants died. Combining in one model BMI and a strongly correlated waist index altered the association patterns with mortality, to a predominantly negative association for BMI and a stronger positive association for the waist index, while combining BMI with the uncorrelated A Body Shape Index (ABSI) preserved the association patterns. Sex-specific cohort-wide quartiles of waist indices correlated with BMI could not separate high-risk from low-risk individuals within underweight (BMI<18.5 kg/m(2)) or obese (BMI30 kg/m(2)) categories, while the highest quartile of ABSI separated 18-39% of the individuals within each BMI category, which had 22-55% higher risk of death. In conclusion, only a waist index independent of BMI by design, such as ABSI, complements BMI and enables efficient risk stratification, which could facilitate personalisation of screening, treatment and monitoring. KW - all-cause mortality KW - anthropometric measures KW - mass index KW - overweight KW - cancer KW - prediction KW - adiposity KW - size Y1 - 2020 VL - 10 IS - 1 PB - Springer Nature CY - Berlin ER - TY - GEN A1 - Christakoudi, Sofa A1 - Tsilidis, Konstantinos K. A1 - Muller, David C. A1 - Freisling, Heinz A1 - Weiderpass, Elisabete A1 - Overvad, Kim A1 - Söderberg, Stefan A1 - Häggström, Christel A1 - Pischon, Tobias A1 - Dahm, Christina C. A1 - Zhang, Jie A1 - Tjønneland, Anne A1 - Schulze, Matthias Bernd T1 - A Body Shape Index (ABSI) achieves better mortality risk stratification than alternative indices of abdominal obesity: results from a large European cohort T2 - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - Abdominal and general adiposity are independently associated with mortality, but there is no consensus on how best to assess abdominal adiposity. We compared the ability of alternative waist indices to complement body mass index (BMI) when assessing all-cause mortality. We used data from 352,985 participants in the European Prospective Investigation into Cancer and Nutrition (EPIC) and Cox proportional hazards models adjusted for other risk factors. During a mean follow-up of 16.1 years, 38,178 participants died. Combining in one model BMI and a strongly correlated waist index altered the association patterns with mortality, to a predominantly negative association for BMI and a stronger positive association for the waist index, while combining BMI with the uncorrelated A Body Shape Index (ABSI) preserved the association patterns. Sex-specific cohort-wide quartiles of waist indices correlated with BMI could not separate high-risk from low-risk individuals within underweight (BMI<18.5 kg/m(2)) or obese (BMI30 kg/m(2)) categories, while the highest quartile of ABSI separated 18-39% of the individuals within each BMI category, which had 22-55% higher risk of death. In conclusion, only a waist index independent of BMI by design, such as ABSI, complements BMI and enables efficient risk stratification, which could facilitate personalisation of screening, treatment and monitoring. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1200 KW - all-cause mortality KW - anthropometric measures KW - mass index KW - overweight KW - cancer KW - prediction KW - adiposity KW - size Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-525827 SN - 1866-8372 IS - 1 ER - TY - JOUR A1 - Christakoudi, Sofia A1 - Pagoni, Panagiota A1 - Ferrari, Pietro A1 - Cross, Amanda J. A1 - Tzoulaki, Ioanna A1 - Muller, David C. A1 - Weiderpass, Elisabete A1 - Freisling, Heinz A1 - Murphy, Neil A1 - Dossus, Laure A1 - Turzanski Fortner, Renee A1 - Agudo, Antonio A1 - Overvad, Kim A1 - Perez-Cornago, Aurora A1 - Key, Timothy J. A1 - Brennan, Paul A1 - Johansson, Mattias A1 - Tjonneland, Anne A1 - Halkjaer, Jytte A1 - Boutron-Ruault, Marie-Christine A1 - Artaud, Fanny A1 - Severi, Gianluca A1 - Kaaks, Rudolf A1 - Schulze, Matthias Bernd A1 - Bergmann, Manuela M. A1 - Masala, Giovanna A1 - Grioni, Sara A1 - Simeon, Vittorio A1 - Tumino, Rosario A1 - Sacerdote, Carlotta A1 - Skeie, Guri A1 - Rylander, Charlotta A1 - Borch, Kristin Benjaminsen A1 - Quiros, J. Ramon A1 - Rodriguez-Barranco, Miguel A1 - Chirlaque, Maria-Dolores A1 - Ardanaz, Eva A1 - Amiano, Pilar A1 - Drake, Isabel A1 - Stocks, Tanja A1 - Häggström, Christel A1 - Harlid, Sophia A1 - Ellingjord-Dale, Merete A1 - Riboli, Elio A1 - Tsilidis, Konstantinos K. T1 - Weight change in middle adulthood and risk of cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort JF - International journal of cancer N2 - Obesity is a risk factor for several major cancers. Associations of weight change in middle adulthood with cancer risk, however, are less clear. We examined the association of change in weight and body mass index (BMI) category during middle adulthood with 42 cancers, using multivariable Cox proportional hazards models in the European Prospective Investigation into Cancer and Nutrition cohort. Of 241 323 participants (31% men), 20% lost and 32% gained weight (>0.4 to 5.0 kg/year) during 6.9 years (average). During 8.0 years of follow-up after the second weight assessment, 20 960 incident cancers were ascertained. Independent of baseline BMI, weight gain (per one kg/year increment) was positively associated with cancer of the corpus uteri (hazard ratio [HR] = 1.14; 95% confidence interval: 1.05-1.23). Compared to stable weight (+/- 0.4 kg/year), weight gain (>0.4 to 5.0 kg/year) was positively associated with cancers of the gallbladder and bile ducts (HR = 1.41; 1.01-1.96), postmenopausal breast (HR = 1.08; 1.00-1.16) and thyroid (HR = 1.40; 1.04-1.90). Compared to maintaining normal weight, maintaining overweight or obese BMI (World Health Organisation categories) was positively associated with most obesity-related cancers. Compared to maintaining the baseline BMI category, weight gain to a higher BMI category was positively associated with cancers of the postmenopausal breast (HR = 1.19; 1.06-1.33), ovary (HR = 1.40; 1.04-1.91), corpus uteri (HR = 1.42; 1.06-1.91), kidney (HR = 1.80; 1.20-2.68) and pancreas in men (HR = 1.81; 1.11-2.95). Losing weight to a lower BMI category, however, was inversely associated with cancers of the corpus uteri (HR = 0.40; 0.23-0.69) and colon (HR = 0.69; 0.52-0.92). Our findings support avoiding weight gain and encouraging weight loss in middle adulthood. KW - BMI change KW - cancer KW - middle adulthood KW - weight gain KW - weight loss Y1 - 2020 U6 - https://doi.org/10.1002/ijc.33339 SN - 0020-7136 SN - 1097-0215 VL - 148 IS - 7 SP - 1637 EP - 1651 PB - Wiley CY - Hoboken ER - TY - GEN A1 - Christakoudi, Sofia A1 - Pagoni, Panagiota A1 - Ferrari, Pietro A1 - Cross, Amanda J. A1 - Tzoulaki, Ioanna A1 - Muller, David C. A1 - Weiderpass, Elisabete A1 - Freisling, Heinz A1 - Murphy, Neil A1 - Dossus, Laure A1 - Turzanski Fortner, Renee A1 - Agudo, Antonio A1 - Overvad, Kim A1 - Perez-Cornago, Aurora A1 - Key, Timothy J. A1 - Brennan, Paul A1 - Johansson, Mattias A1 - Tjonneland, Anne A1 - Halkjaer, Jytte A1 - Boutron-Ruault, Marie-Christine A1 - Artaud, Fanny A1 - Severi, Gianluca A1 - Kaaks, Rudolf A1 - Schulze, Matthias Bernd A1 - Bergmann, Manuela M. A1 - Masala, Giovanna A1 - Grioni, Sara A1 - Simeon, Vittorio A1 - Tumino, Rosario A1 - Sacerdote, Carlotta A1 - Skeie, Guri A1 - Rylander, Charlotta A1 - Borch, Kristin Benjaminsen A1 - Quiros, J. Ramon A1 - Rodriguez-Barranco, Miguel A1 - Chirlaque, Maria-Dolores A1 - Ardanaz, Eva A1 - Amiano, Pilar A1 - Drake, Isabel A1 - Stocks, Tanja A1 - Haggstrom, Christel A1 - Harlid, Sophia A1 - Ellingjord-Dale, Merete A1 - Riboli, Elio A1 - Tsilidis, Konstantinos K. T1 - Weight change in middle adulthood and risk of cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - Obesity is a risk factor for several major cancers. Associations of weight change in middle adulthood with cancer risk, however, are less clear. We examined the association of change in weight and body mass index (BMI) category during middle adulthood with 42 cancers, using multivariable Cox proportional hazards models in the European Prospective Investigation into Cancer and Nutrition cohort. Of 241 323 participants (31% men), 20% lost and 32% gained weight (>0.4 to 5.0 kg/year) during 6.9 years (average). During 8.0 years of follow-up after the second weight assessment, 20 960 incident cancers were ascertained. Independent of baseline BMI, weight gain (per one kg/year increment) was positively associated with cancer of the corpus uteri (hazard ratio [HR] = 1.14; 95% confidence interval: 1.05-1.23). Compared to stable weight (+/- 0.4 kg/year), weight gain (>0.4 to 5.0 kg/year) was positively associated with cancers of the gallbladder and bile ducts (HR = 1.41; 1.01-1.96), postmenopausal breast (HR = 1.08; 1.00-1.16) and thyroid (HR = 1.40; 1.04-1.90). Compared to maintaining normal weight, maintaining overweight or obese BMI (World Health Organisation categories) was positively associated with most obesity-related cancers. Compared to maintaining the baseline BMI category, weight gain to a higher BMI category was positively associated with cancers of the postmenopausal breast (HR = 1.19; 1.06-1.33), ovary (HR = 1.40; 1.04-1.91), corpus uteri (HR = 1.42; 1.06-1.91), kidney (HR = 1.80; 1.20-2.68) and pancreas in men (HR = 1.81; 1.11-2.95). Losing weight to a lower BMI category, however, was inversely associated with cancers of the corpus uteri (HR = 0.40; 0.23-0.69) and colon (HR = 0.69; 0.52-0.92). Our findings support avoiding weight gain and encouraging weight loss in middle adulthood. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1373 KW - BMI change KW - cancer KW - middle adulthood KW - weight gain KW - weight loss Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-573609 SN - 1866-8372 IS - 7 ER - TY - JOUR A1 - Winck, Flavia Vischi A1 - Arvidsson, Samuel Janne A1 - Mauricio Riano-Pachon, Diego A1 - Hempel, Sabrina A1 - Koseska, Aneta A1 - Nikoloski, Zoran A1 - Urbina Gomez, David Alejandro A1 - Rupprecht, Jens A1 - Müller-Röber, Bernd T1 - Genome-wide identification of regulatory elements and reconstruction of gene regulatory networks of the green alga chlamydomonas reinhardtii under carbon deprivation JF - PLoS one N2 - The unicellular green alga Chlamydomonas reinhardtii is a long-established model organism for studies on photosynthesis and carbon metabolism-related physiology. Under conditions of air-level carbon dioxide concentration [CO2], a carbon concentrating mechanism (CCM) is induced to facilitate cellular carbon uptake. CCM increases the availability of carbon dioxide at the site of cellular carbon fixation. To improve our understanding of the transcriptional control of the CCM, we employed FAIRE-seq (formaldehyde-assisted Isolation of Regulatory Elements, followed by deep sequencing) to determine nucleosome-depleted chromatin regions of algal cells subjected to carbon deprivation. Our FAIRE data recapitulated the positions of known regulatory elements in the promoter of the periplasmic carbonic anhydrase (Cah1) gene, which is upregulated during CCM induction, and revealed new candidate regulatory elements at a genome-wide scale. In addition, time series expression patterns of 130 transcription factor (TF) and transcription regulator (TR) genes were obtained for cells cultured under photoautotrophic condition and subjected to a shift from high to low [CO2]. Groups of co-expressed genes were identified and a putative directed gene-regulatory network underlying the CCM was reconstructed from the gene expression data using the recently developed IOTA (inner composition alignment) method. Among the candidate regulatory genes, two members of the MYB-related TF family, Lcr1 (Low-CO2 response regulator 1) and Lcr2 (Low-CO2 response regulator 2), may play an important role in down-regulating the expression of a particular set of TF and TR genes in response to low [CO2]. The results obtained provide new insights into the transcriptional control of the CCM and revealed more than 60 new candidate regulatory genes. Deep sequencing of nucleosome-depleted genomic regions indicated the presence of new, previously unknown regulatory elements in the C. reinhardtii genome. Our work can serve as a basis for future functional studies of transcriptional regulator genes and genomic regulatory elements in Chlamydomonas. Y1 - 2013 U6 - https://doi.org/10.1371/journal.pone.0079909 SN - 1932-6203 VL - 8 IS - 11 PB - PLoS CY - San Fransisco ER - TY - JOUR A1 - Omranian, Nooshin A1 - Eloundou-Mbebi, Jeanne Marie Onana A1 - Müller-Röber, Bernd A1 - Nikoloski, Zoran T1 - Gene regulatory network inference using fused LASSO on multiple data sets JF - Scientific reports N2 - Devising computational methods to accurately reconstruct gene regulatory networks given gene expression data is key to systems biology applications. Here we propose a method for reconstructing gene regulatory networks by simultaneous consideration of data sets from different perturbation experiments and corresponding controls. The method imposes three biologically meaningful constraints: (1) expression levels of each gene should be explained by the expression levels of a small number of transcription factor coding genes, (2) networks inferred from different data sets should be similar with respect to the type and number of regulatory interactions, and (3) relationships between genes which exhibit similar differential behavior over the considered perturbations should be favored. We demonstrate that these constraints can be transformed in a fused LASSO formulation for the proposed method. The comparative analysis on transcriptomics time-series data from prokaryotic species, Escherichia coli and Mycobacterium tuberculosis, as well as a eukaryotic species, mouse, demonstrated that the proposed method has the advantages of the most recent approaches for regulatory network inference, while obtaining better performance and assigning higher scores to the true regulatory links. The study indicates that the combination of sparse regression techniques with other biologically meaningful constraints is a promising framework for gene regulatory network reconstructions. Y1 - 2016 U6 - https://doi.org/10.1038/srep20533 SN - 2045-2322 VL - 6 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Omranian, Nooshin A1 - Klie, Sebastian A1 - Müller-Röber, Bernd A1 - Nikoloski, Zoran T1 - Network-based segmentation of biological multivariate time series JF - PLoS one N2 - Molecular phenotyping technologies (e.g., transcriptomics, proteomics, and metabolomics) offer the possibility to simultaneously obtain multivariate time series (MTS) data from different levels of information processing and metabolic conversions in biological systems. As a result, MTS data capture the dynamics of biochemical processes and components whose couplings may involve different scales and exhibit temporal changes. Therefore, it is important to develop methods for determining the time segments in MTS data, which may correspond to critical biochemical events reflected in the coupling of the system's components. Here we provide a novel network-based formalization of the MTS segmentation problem based on temporal dependencies and the covariance structure of the data. We demonstrate that the problem of partitioning MTS data into k segments to maximize a distance function, operating on polynomially computable network properties, often used in analysis of biological network, can be efficiently solved. To enable biological interpretation, we also propose a breakpoint-penalty (BP-penalty) formulation for determining MTS segmentation which combines a distance function with the number/length of segments. Our empirical analyses of synthetic benchmark data as well as time-resolved transcriptomics data from the metabolic and cell cycles of Saccharomyces cerevisiae demonstrate that the proposed method accurately infers the phases in the temporal compartmentalization of biological processes. In addition, through comparison on the same data sets, we show that the results from the proposed formalization of the MTS segmentation problem match biological knowledge and provide more rigorous statistical support in comparison to the contending state-of-the-art methods. Y1 - 2013 U6 - https://doi.org/10.1371/journal.pone.0062974 SN - 1932-6203 VL - 8 IS - 5 PB - PLoS CY - San Fransisco ER - TY - JOUR A1 - Omranian, Nooshin A1 - Müller-Röber, Bernd A1 - Nikoloski, Zoran T1 - Segmentation of biological multivariate time-series data JF - Scientific reports N2 - Time-series data from multicomponent systems capture the dynamics of the ongoing processes and reflect the interactions between the components. The progression of processes in such systems usually involves check-points and events at which the relationships between the components are altered in response to stimuli. Detecting these events together with the implicated components can help understand the temporal aspects of complex biological systems. Here we propose a regularized regression-based approach for identifying breakpoints and corresponding segments from multivariate time-series data. In combination with techniques from clustering, the approach also allows estimating the significance of the determined breakpoints as well as the key components implicated in the emergence of the breakpoints. Comparative analysis with the existing alternatives demonstrates the power of the approach to identify biologically meaningful breakpoints in diverse time-resolved transcriptomics data sets from the yeast Saccharomyces cerevisiae and the diatom Thalassiosira pseudonana. Y1 - 2015 U6 - https://doi.org/10.1038/srep08937 SN - 2045-2322 VL - 5 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Omranian, Nooshin A1 - Müller-Röber, Bernd A1 - Nikoloski, Zoran T1 - PageRank-based identification of signaling crosstalk from transcriptomics data the case of Arabidopsis thaliana JF - Molecular BioSystems N2 - The levels of cellular organization, from gene transcription to translation to protein-protein interaction and metabolism, operate via tightly regulated mutual interactions, facilitating organismal adaptability and various stress responses. Characterizing the mutual interactions between genes, transcription factors, and proteins involved in signaling, termed crosstalk, is therefore crucial for understanding and controlling cells' functionality. We aim at using high-throughput transcriptomics data to discover previously unknown links between signaling networks. We propose and analyze a novel method for crosstalk identification which relies on transcriptomics data and overcomes the lack of complete information for signaling pathways in Arabidopsis thaliana. Our method first employs a network-based transformation of the results from the statistical analysis of differential gene expression in given groups of experiments under different signal-inducing conditions. The stationary distribution of a random walk (similar to the PageRank algorithm) on the constructed network is then used to determine the putative transcripts interrelating different signaling pathways. With the help of the proposed method, we analyze a transcriptomics data set including experiments from four different stresses/signals: nitrate, sulfur, iron, and hormones. We identified promising gene candidates, downstream of the transcription factors (TFs), associated to signaling crosstalk, which were validated through literature mining. In addition, we conduct a comparative analysis with the only other available method in this field which used a biclustering-based approach. Surprisingly, the biclustering-based approach fails to robustly identify any candidate genes involved in the crosstalk of the analyzed signals. We demonstrate that our proposed method is more robust in identifying gene candidates involved downstream of the signaling crosstalk for species for which large transcriptomics data sets, normalized with the same techniques, are available. Moreover, unlike approaches based on biclustering, our approach does not rely on any hidden parameters. Y1 - 2012 U6 - https://doi.org/10.1039/c2mb05365a SN - 1742-206X VL - 8 IS - 4 SP - 1121 EP - 1127 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Engqvist, Martin K. M. A1 - Schmitz, Jessica A1 - Gertzmann, Anke A1 - Florian, Alexandra A1 - Jaspert, Nils A1 - Arif, Muhammad A1 - Balazadeh, Salma A1 - Müller-Röber, Bernd A1 - Fernie, Alisdair A1 - Maurino, Veronica G. T1 - GLYCOLATE OXIDASE3, a Glycolate Oxidase Homolog of Yeast L-Lactate Cytochrome c Oxidoreductase, Supports L-Lactate Oxidation in Roots of Arabidopsis JF - Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants N2 - In roots of Arabidopsis (Arabidopsis thaliana), L-lactate is generated by the reduction of pyruvate via L-lactate dehydrogenase, but this enzyme does not efficiently catalyze the reverse reaction. Here, we identify the Arabidopsis glycolate oxidase (GOX) paralogs GOX1, GOX2, and GOX3 as putative L-lactate-metabolizing enzymes based on their homology to CYB2, the L-lactate cytochrome c oxidoreductase from the yeast Saccharomyces cerevisiae. We found that GOX3 uses L-lactate with a similar efficiency to glycolate; in contrast, the photorespiratory isoforms GOX1 and GOX2, which share similar enzymatic properties, use glycolate with much higher efficiencies than L-lactate. The key factor making GOX3 more efficient with L-lactate than GOX1 and GOX2 is a 5- to 10-fold lower Km for the substrate. Consequently, only GOX3 can efficiently metabolize L-lactate at low intracellular concentrations. Isotope tracer experiments as well as substrate toxicity tests using GOX3 loss-of-function and overexpressor plants indicate that L-lactate is metabolized in vivo by GOX3. Moreover, GOX3 rescues the lethal growth phenotype of a yeast strain lacking CYB2, which cannot grow on L-lactate as a sole carbon source. GOX3 is predominantly present in roots and mature to aging leaves but is largely absent from young photosynthetic leaves, indicating that it plays a role predominantly in heterotrophic rather than autotrophic tissues, at least under standard growth conditions. In roots of plants grown under normoxic conditions, loss of function of GOX3 induces metabolic rearrangements that mirror wild-type responses under hypoxia. Thus, we identified GOX3 as the enzyme that metabolizes L-lactate to pyruvate in vivo and hypothesize that it may ensure the sustainment of low levels of L-lactate after its formation under normoxia. Y1 - 2015 U6 - https://doi.org/10.1104/pp.15.01003 SN - 0032-0889 SN - 1532-2548 VL - 169 IS - 2 SP - 1042 EP - 1061 PB - American Society of Plant Physiologists CY - Rockville ER - TY - JOUR A1 - Wang, Ting A1 - Tohge, Takayuki A1 - Ivakov, Alexander A1 - Müller-Röber, Bernd A1 - Fernie, Alisdair A1 - Mutwil, Marek A1 - Schippers, Jos H. M. A1 - Persson, Staffan T1 - Salt-Related MYB1 Coordinates Abscisic Acid Biosynthesis and Signaling during Salt Stress in Arabidopsis JF - Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants N2 - Abiotic stresses, such as salinity, cause global yield loss of all major crop plants. Factors and mechanisms that can aid in plant breeding for salt stress tolerance are therefore of great importance for food and feed production. Here, we identified a MYB-like transcription factor, Salt-Related MYB1 (SRM1), that negatively affects Arabidopsis (Arabidopsis thaliana) seed germination under saline conditions by regulating the levels of the stress hormone abscisic acid (ABA). Accordingly, several ABA biosynthesis and signaling genes act directly downstream of SRM1, including SALT TOLERANT1/NINE-CIS-EPOXYCAROTENOID DIOXYGENASE3, RESPONSIVE TO DESICCATION26, and Arabidopsis NAC DOMAIN CONTAINING PROTEIN19. Furthermore, SRM1 impacts vegetative growth and leaf shape. We show that SRM1 is an important transcriptional regulator that directly targets ABA biosynthesis and signaling-related genes and therefore may be regarded as an important regulator of ABA-mediated salt stress tolerance. Y1 - 2015 U6 - https://doi.org/10.1104/pp.15.00962 SN - 0032-0889 SN - 1532-2548 VL - 169 IS - 2 SP - 1027 EP - + PB - American Society of Plant Physiologists CY - Rockville ER - TY - GEN A1 - Durgud, Meriem A1 - Gupta, Saurabh A1 - Ivanov, Ivan A1 - Omidbakhshfard, Mohammad Amin A1 - Benina, Maria A1 - Alseekh, Saleh A1 - Staykov, Nikola A1 - Hauenstein, Mareike A1 - Dijkwel, Paul P. A1 - Hortensteiner, Stefan A1 - Toneva, Valentina A1 - Brotman, Yariv A1 - Fernie, Alisdair A1 - Müller-Röber, Bernd A1 - Gechev, Tsanko S. T1 - Molecular mechanisms preventing senescence in response to prolonged darkness in a desiccation-tolerant plant T2 - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe N2 - The desiccation-tolerant plant Haberlea rhodopensis can withstand months of darkness without any visible senescence. Here, we investigated the molecular mechanisms of this adaptation to prolonged (30 d) darkness and subsequent return to light. H. rhodopensis plants remained green and viable throughout the dark treatment. Transcriptomic analysis revealed that darkness regulated several transcription factor (TF) genes. Stress-and autophagy-related TFs such as ERF8, HSFA2b, RD26, TGA1, and WRKY33 were up-regulated, while chloroplast-and flowering-related TFs such as ATH1, COL2, COL4, RL1, and PTAC7 were repressed. PHYTOCHROME INTERACTING FACTOR4, a negative regulator of photomorphogenesis and promoter of senescence, also was down-regulated. In response to darkness, most of the photosynthesis-and photorespiratory-related genes were strongly down-regulated, while genes related to autophagy were up-regulated. This occurred concomitant with the induction of SUCROSE NON-FERMENTING1-RELATED PROTEIN KINASES (SnRK1) signaling pathway genes, which regulate responses to stress-induced starvation and autophagy. Most of the genes associated with chlorophyll catabolism, which are induced by darkness in dark-senescing species, were either unregulated (PHEOPHORBIDE A OXYGENASE, PAO; RED CHLOROPHYLL CATABOLITE REDUCTASE, RCCR) or repressed (STAY GREEN-LIKE, PHEOPHYTINASE, and NON-YELLOW COLORING1). Metabolite profiling revealed increases in the levels of many amino acids in darkness, suggesting increased protein degradation. In darkness, levels of the chloroplastic lipids digalactosyldiacylglycerol, monogalactosyldiacylglycerol, phosphatidylglycerol, and sulfoquinovosyldiacylglycerol decreased, while those of storage triacylglycerols increased, suggesting degradation of chloroplast membrane lipids and their conversion to triacylglycerols for use as energy and carbon sources. Collectively, these data show a coordinated response to darkness, including repression of photosynthetic, photorespiratory, flowering, and chlorophyll catabolic genes, induction of autophagy and SnRK1 pathways, and metabolic reconfigurations that enable survival under prolonged darkness. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 778 KW - beta-oxidation KW - craterostigma-plantagineum KW - photosynthetic apparatus KW - transcription factors KW - lipid-metabolism KW - leaf senescence KW - fatty-acid KW - arabidopsis KW - chlorophyll KW - stress Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-437588 IS - 778 SP - 1319 EP - 1338 ER - TY - GEN A1 - Ma, Xuemin A1 - Zhang, Youjun A1 - Turečková, Veronika A1 - Xue, Gang-Ping A1 - Fernie, Alisdair A1 - Müller-Röber, Bernd A1 - Balazadeh, Salma T1 - The NAC transcription factor SlNAP2 regulates leaf senescence and fruit yield in tomato T2 - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe N2 - Leaf senescence is an essential physiological process in plants that supports the recycling of nitrogen and other nutrients to support the growth of developing organs, including young leaves, seeds, and fruits. Thus, the regulation of senescence is crucial for evolutionary success in wild populations and for increasing yield in crops. Here, we describe the influence of a NAC transcription factor, SlNAP2 (Solanum lycopersicum NAC-like, activated by Apetala3/Pistillata), that controls both leaf senescence and fruit yield in tomato (S. lycopersicum). SlNAP2 expression increases during age-dependent and dark-induced leaf senescence. We demonstrate that SlNAP2 activates SlSAG113 (S. lycopersicum SENESCENCE-ASSOCIATED GENE113), a homolog of Arabidopsis (Arabidopsis thaliana) SAG113, chlorophyll degradation genes such as SlSGR1 (S. lycopersicum senescence-inducible chloroplast stay-green protein 1) and SlPAO (S. lycopersicum pheide a oxygenase), and other downstream targets by directly binding to their promoters, thereby promoting leaf senescence. Furthermore, SlNAP2 directly controls the expression of genes important for abscisic acid (ABA) biosynthesis, S. lycopersicum 9-cis-epoxycarotenoid dioxygenase 1 (SlNCED1); transport, S. lycopersicum ABC transporter G family member 40 (SlABCG40); and degradation, S. lycopersicum ABA 8'-hydroxylase (SlCYP707A2), indicating that SlNAP2 has a complex role in establishing ABA homeostasis during leaf senescence. Inhibiting SlNAP2 expression in transgenic tomato plants impedes leaf senescence but enhances fruit yield and sugar content likely due to prolonged leaf photosynthesis in aging tomato plants. Our data indicate that SlNAP2 has a central role in controlling leaf senescence and fruit yield in tomato. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 787 KW - abscisic-acid KW - arabidopsis-thaliana KW - chlorophyll degradation KW - aba biosynthesis KW - oryza-sativa KW - rice leaves KW - genes KW - expression KW - metabolism KW - protein Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-437643 SN - 1866-8372 IS - 787 ER - TY - JOUR A1 - Gechev, Tsanko S. A1 - Hille, Jacques A1 - Woerdenbag, Herman J. A1 - Benina, Maria A1 - Mehterov, Nikolay A1 - Toneva, Valentina A1 - Fernie, Alisdair A1 - Müller-Röber, Bernd T1 - Natural products from resurrection plants: Potential for medical applications JF - Biotechnology advances : an international review journal ; research reviews and patent abstracts N2 - Resurrection species are a group of land plants that can tolerate extreme desiccation of their vegetative tissues during harsh drought stress, and still quickly often within hours regain normal physiological and metabolic functions following rehydration. At the molecular level, this desiccation tolerance is attributed to basal cellular mechanisms including the constitutive expression of stress-associated genes and high levels of protective metabolites present already in the absence of stress, as well as to transcriptome and metabolome reconfigurations rapidly occurring during the initial phases of drought stress. Parts of this response are conferred by unique metabolites, including a diverse array of sugars, phenolic compounds, and polyols, some of which accumulate to high concentrations within the plant cell. In addition to drought stress, these metabolites are proposed to contribute to the protection against other abiotic stresses and to an increased oxidative stress tolerance. Recently, extracts of resurrection species and particular secondary metabolites therein were reported to display biological activities of importance to medicine, with e.g. antibacterial, anticancer, antifungal, and antiviral activities, rendering them possible candidates for the development of novel drug substances as well as for cosmetics. Herein, we provide an overview of the metabolite composition of resurrection species, summarize the latest reports related to the use of natural products from resurrection plants, and outline their potential for medical applications. (C) 2014 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). KW - Antibacterial KW - Anticancer KW - Antifungal KW - Antiviral KW - Natural product KW - Resurrection plant KW - Secondary metabolite KW - Synthetic biology Y1 - 2014 U6 - https://doi.org/10.1016/j.biotechadv.2014.03.005 SN - 0734-9750 SN - 1873-1899 VL - 32 IS - 6 SP - 1091 EP - 1101 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Alseekh, Saleh A1 - Tohge, Takayuki A1 - Wendenberg, Regina A1 - Scossa, Federico A1 - Omranian, Nooshin A1 - Li, Jie A1 - Kleessen, Sabrina A1 - Giavalisco, Patrick A1 - Pleban, Tzili A1 - Müller-Röber, Bernd A1 - Zamir, Dani A1 - Nikoloski, Zoran A1 - Fernie, Alisdair T1 - Identification and Mode of Inheritance of Quantitative Trait Loci for Secondary Metabolite Abundance in Tomato JF - The plant cell N2 - A large-scale metabolic quantitative trait loci (mQTL) analysis was performed on the well-characterized Solanum pennellii introgression lines to investigate the genomic regions associated with secondary metabolism in tomato fruit pericarp. In total, 679 mQTLs were detected across the 76 introgression lines. Heritability analyses revealed that mQTLs of secondary metabolism were less affected by environment than mQTLs of primary metabolism. Network analysis allowed us to assess the interconnectivity of primary and secondary metabolism as well as to compare and contrast their respective associations with morphological traits. Additionally, we applied a recently established real-time quantitative PCR platform to gain insight into transcriptional control mechanisms of a subset of the mQTLs, including those for hydroxycinnamates, acyl-sugar, naringenin chalcone, and a range of glycoalkaloids. Intriguingly, many of these compounds displayed a dominant-negative mode of inheritance, which is contrary to the conventional wisdom that secondary metabolite contents decreased on domestication. We additionally performed an exemplary evaluation of two candidate genes for glycolalkaloid mQTLs via the use of virus-induced gene silencing. The combined data of this study were compared with previous results on primary metabolism obtained from the same material and to other studies of natural variance of secondary metabolism. Y1 - 2015 U6 - https://doi.org/10.1105/tpc.114.132266 SN - 1040-4651 SN - 1532-298X VL - 27 IS - 3 SP - 485 EP - 512 PB - American Society of Plant Physiologists CY - Rockville ER - TY - JOUR A1 - Serrano-Munoz, Itziar A1 - Roveda, Ilaria A1 - Kupsch, Andreas A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Synchrotron X-ray refraction detects microstructure and porosity evolution during in-situ heat treatments JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing N2 - For the first time, synchrotron X-ray refraction radiography (SXRR) has been paired with in-situ heat treatment to monitor microstructure and porosity evolution as a function of temperature. The investigated material was a laser powder bed fusion (LPBF) manufactured AlSi10Mg, where the initial eutectic Si network is known to disintegrate and spherodize into larger particles with increasing temperature. Such alloy is also prone to ther-mally induced porosity (TIP). We show that SXRR allows detecting the changes in the Si-phase morphology upon heating, while this is currently possible only using scanning electron microscopy. SXRR also allows observing the growth of pores, usually studied via X-ray computed tomography, but on much smaller fields-of-view. Our results show the great potential of in-situ SXRR as a tool to gain in-depth knowledge of the susceptibility of any material to thermally induced damage and/or microstructure evolution over statistically relevant volumes. KW - synchrotron X-ray refraction radiography (SXRR) KW - Si network disintegration KW - thermally induced porosity (TIP) KW - laser powder bed fusion (LPBF) AlSi10Mg alloy KW - statistically relevant volumes Y1 - 2022 U6 - https://doi.org/10.1016/j.msea.2022.142732 SN - 0921-5093 SN - 1873-4936 VL - 838 PB - Elsevier CY - Lausanne ER - TY - JOUR A1 - Alshareef, Nouf Owdah A1 - Otterbach, Sophie L. A1 - Allu, Annapurna Devi A1 - Woo, Yong H. A1 - de Werk, Tobias A1 - Kamranfar, Iman A1 - Müller-Röber, Bernd A1 - Tester, Mark A1 - Balazadeh, Salma A1 - Schmöckel, Sandra M. T1 - NAC transcription factors ATAF1 and ANAC055 affect the heat stress response in Arabidopsis JF - Scientific reports N2 - Pre-exposing (priming) plants to mild, non-lethal elevated temperature improves their tolerance to a later higher-temperature stress (triggering stimulus), which is of great ecological importance. 'Thermomemory' is maintaining this tolerance for an extended period of time. NAM/ATAF1/2/ CUC2 (NAC) proteins are plant-specific transcription factors (TFs) that modulate responses to abiotic stresses, including heat stress (HS). Here, we investigated the potential role of NACs for thermomemory. We determined the expression of 104 Ara bidopsis NAC genes after priming and triggering heat stimuli, and found ATAF1 expression is strongly induced right after priming and declines below control levels thereafter during thermorecovery. Knockout mutants of ATAF1 show better thermomemory than wild type, revealing a negative regulatory role. Differential expression analyses of RNA-seq data from ATAF1 overexpressor, ataf1 mutant and wild-type plants after heat priming revealed five genes that might be priming-associated direct targets of ATAF1: AT2G31260 (ATG9), AT2G41640 (GT61), AT3G44990 (XTH31), AT4G27720 and AT3G23540. Based on co-expression analyses applied to the aforementioned RNA-seq profiles, we identified ANAC055 to be transcriptionally co-regulated with ATAF1. Like atafl, anac055 mutants show improved thermomemory, revealing a potential co-control of both NACTFs over thermomemory. Our data reveals a core importance of two NAC transcription factors, ATAF1 and ANAC055, for thermomemory. Y1 - 2022 U6 - https://doi.org/10.1038/s41598-022-14429-x SN - 2045-2322 VL - 12 IS - 1 PB - Nature Research CY - Berlin ER - TY - JOUR A1 - Moreno Curtidor, Catalina A1 - Annunziata, Maria Grazia A1 - Gupta, Saurabh A1 - Apelt, Federico A1 - Richard, Sarah Isabel A1 - Kragler, Friedrich A1 - Müller-Röber, Bernd A1 - Olas, Justyna Jadwiga T1 - Physiological profiling of embryos and dormant seeds in two Arabidopsis accessions reveals a metabolic switch in carbon reserve accumulation JF - Frontiers in plant science N2 - In flowering plants, sugars act as carbon sources providing energy for developing embryos and seeds. Although most studies focus on carbon metabolism in whole seeds, knowledge about how particular sugars contribute to the developmental transitions during embryogenesis is scarce. To develop a quantitative understanding of how carbon composition changes during embryo development, and to determine how sugar status contributes to final seed or embryo size, we performed metabolic profiling of hand-dissected embryos at late torpedo and mature stages, and dormant seeds, in two Arabidopsis thaliana accessions with medium [Columbia-0 (Col-0)] and large [Burren-0 (Bur-0)] seed sizes, respectively. Our results show that, in both accessions, metabolite profiles of embryos largely differ from those of dormant seeds. We found that developmental transitions from torpedo to mature embryos, and further to dormant seeds, are associated with major metabolic switches in carbon reserve accumulation. While glucose, sucrose, and starch predominantly accumulated during seed dormancy, fructose levels were strongly elevated in mature embryos. Interestingly, Bur-0 seeds contain larger mature embryos than Col-0 seeds. Fructose and starch were accumulated to significantly higher levels in mature Bur-0 than Col-0 embryos, suggesting that they contribute to the enlarged mature Bur-0 embryos. Furthermore, we found that Bur-0 embryos accumulated a higher level of sucrose compared to hexose sugars and that changes in sucrose metabolism are mediated by sucrose synthase (SUS), with SUS genes acting non-redundantly, and in a tissue-specific manner to utilize sucrose during late embryogenesis. KW - carbon KW - embryo development KW - hexoses KW - metabolites KW - sucrose KW - synthase Y1 - 2020 U6 - https://doi.org/10.3389/fpls.2020.588433 SN - 1664-462X VL - 11 PB - Frontiers Media CY - Lausanne ER - TY - JOUR A1 - Sedaghatmehr, Mastoureh A1 - Thirumalaikumar, Venkatesh P. A1 - Kamranfar, Iman A1 - Schulz, Karina A1 - Müller-Röber, Bernd A1 - Sampathkumar, Arun A1 - Balazadeh, Salma T1 - Autophagy complements metalloprotease FtsH6 in degrading plastid heat shock protein HSP21 during heat stress recovery JF - The journal of experimental botany : an official publication of the Society for Experimental Biology and of the Federation of European Societies of Plant Physiology N2 - Moderate and temporary heat stresses prime plants to tolerate, and survive, a subsequent severe heat stress. Such acquired thermotolerance can be maintained for several days under normal growth conditions, and can create a heat stress memory. We recently demonstrated that plastid-localized small heat shock protein 21 ( HSP21) is a key component of heat stress memory in Arabidopsis thaliana. A sustained high abundance of HSP21 during the heat stress recovery phase extends heat stress memory. The level of HSP21 is negatively controlled by plastid-localized metalloprotease FtsH6 during heat stress recovery. Here, we demonstrate that autophagy, a cellular recycling mechanism, exerts additional control over HSP21 degradation. Genetic and chemical disruption of both metalloprotease activity and autophagy trigger superior HSP21 accumulation, thereby improving memory. Furthermore, we provide evidence that autophagy cargo receptor ATG8-INTERACTING PROTEIN1 (ATI1) is associated with heat stress memory. ATI1 bodies co-localize with both autophagosomes and HSP21, and their abundance and transport to the vacuole increase during heat stress recovery. Together, our results provide new insights into the module for control of the regulation of heat stress memory, in which two distinct protein degradation pathways act in concert to degrade HSP21, thereby enabling cells to recover from the heat stress effect at the cost of reducing the heat stress memory. KW - Arabidopsis thaliana KW - ATI1 KW - FtsH6 KW - heat stress KW - HSP21 KW - plastid KW - selective autophagy KW - stress memory KW - stress recovery Y1 - 2021 U6 - https://doi.org/10.1093/jxb/erab304 SN - 0022-0957 SN - 1460-2431 VL - 72 IS - 21 SP - 7498 EP - 7513 PB - Oxford University Press CY - Oxford ER - TY - JOUR A1 - Mettler, Tabea A1 - Mühlhaus, Timo A1 - Hemme, Dorothea A1 - Schöttler, Mark Aurel A1 - Rupprecht, Jens A1 - Idoine, Adam A1 - Veyel, Daniel A1 - Pal, Sunil Kumar A1 - Yaneva-Roder, Liliya A1 - Winck, Flavia Vischi A1 - Sommer, Frederik A1 - Vosloh, Daniel A1 - Seiwert, Bettina A1 - Erban, Alexander A1 - Burgos, Asdrubal A1 - Arvidsson, Samuel Janne A1 - Schoenfelder, Stephanie A1 - Arnold, Anne A1 - Guenther, Manuela A1 - Krause, Ursula A1 - Lohse, Marc A1 - Kopka, Joachim A1 - Nikoloski, Zoran A1 - Müller-Röber, Bernd A1 - Willmitzer, Lothar A1 - Bock, Ralph A1 - Schroda, Michael A1 - Stitt, Mark T1 - Systems analysis of the response of photosynthesis, metabolism, and growth to an increase in irradiance in the photosynthetic model organism chlamydomonas reinhardtii JF - The plant cell N2 - We investigated the systems response of metabolism and growth after an increase in irradiance in the nonsaturating range in the algal model Chlamydomonas reinhardtii. In a three-step process, photosynthesis and the levels of metabolites increased immediately, growth increased after 10 to 15 min, and transcript and protein abundance responded by 40 and 120 to 240 min, respectively. In the first phase, starch and metabolites provided a transient buffer for carbon until growth increased. This uncouples photosynthesis from growth in a fluctuating light environment. In the first and second phases, rising metabolite levels and increased polysome loading drove an increase in fluxes. Most Calvin-Benson cycle (CBC) enzymes were substrate-limited in vivo, and strikingly, many were present at higher concentrations than their substrates, explaining how rising metabolite levels stimulate CBC flux. Rubisco, fructose-1,6-biosphosphatase, and seduheptulose-1,7-bisphosphatase were close to substrate saturation in vivo, and flux was increased by posttranslational activation. In the third phase, changes in abundance of particular proteins, including increases in plastidial ATP synthase and some CBC enzymes, relieved potential bottlenecks and readjusted protein allocation between different processes. Despite reasonable overall agreement between changes in transcript and protein abundance (R-2 = 0.24), many proteins, including those in photosynthesis, changed independently of transcript abundance. Y1 - 2014 U6 - https://doi.org/10.1105/tpc.114.124537 SN - 1040-4651 SN - 1532-298X VL - 26 IS - 6 SP - 2310 EP - 2350 PB - American Society of Plant Physiologists CY - Rockville ER - TY - JOUR A1 - Gechev, Tsanko S. A1 - Benina, Maria A1 - Obata, Toshihiro A1 - Tohge, Takayuki A1 - Neerakkal, Sujeeth A1 - Minkov, Ivan A1 - Hille, Jacques A1 - Temanni, Mohamed-Ramzi A1 - Marriott, Andrew S. A1 - Bergström, Ed A1 - Thomas-Oates, Jane A1 - Antonio, Carla A1 - Müller-Röber, Bernd A1 - Schippers, Jos H. M. A1 - Fernie, Alisdair A1 - Toneva, Valentina T1 - Molecular mechanisms of desiccation tolerance in the resurrection glacial relic Haberlea rhodopensis JF - Cellular and molecular life sciences N2 - Haberlea rhodopensis is a resurrection plant with remarkable tolerance to desiccation. Haberlea exposed to drought stress, desiccation, and subsequent rehydration showed no signs of damage or severe oxidative stress compared to untreated control plants. Transcriptome analysis by next-generation sequencing revealed a drought-induced reprogramming, which redirected resources from growth towards cell protection. Repression of photosynthetic and growth-related genes during water deficiency was concomitant with induction of transcription factors (members of the NAC, NF-YA, MADS box, HSF, GRAS, and WRKY families) presumably acting as master switches of the genetic reprogramming, as well as with an upregulation of genes related to sugar metabolism, signaling, and genes encoding early light-inducible (ELIP), late embryogenesis abundant (LEA), and heat shock (HSP) proteins. At the same time, genes encoding other LEA, HSP, and stress protective proteins were constitutively expressed at high levels even in unstressed controls. Genes normally involved in tolerance to salinity, chilling, and pathogens were also highly induced, suggesting a possible cross-tolerance against a number of abiotic and biotic stress factors. A notable percentage of the genes highly regulated in dehydration and subsequent rehydration were novel, with no sequence homology to genes from other plant genomes. Additionally, an extensive antioxidant gene network was identified with several gene families possessing a greater number of antioxidant genes than most other species with sequenced genomes. Two of the transcripts most abundant during all conditions encoded catalases and five more catalases were induced in water-deficient samples. Using the pharmacological inhibitor 3-aminotriazole (AT) to compromise catalase activity resulted in increased sensitivity to desiccation. Metabolome analysis by GC or LC-MS revealed accumulation of sucrose, verbascose, spermidine, and gamma-aminobutyric acid during drought, as well as particular secondary metabolites accumulating during rehydration. This observation, together with the complex antioxidant system and the constitutive expression of stress protective genes suggests that both constitutive and inducible mechanisms contribute to the extreme desiccation tolerance of H. rhodopensis. KW - Antioxidant genes KW - Catalase KW - Desiccation tolerance KW - Drought stress KW - Metabolome analysis KW - Resurrection plants Y1 - 2013 U6 - https://doi.org/10.1007/s00018-012-1155-6 SN - 1420-682X VL - 70 IS - 4 SP - 689 EP - 709 PB - Springer CY - Basel ER - TY - JOUR A1 - Tabatabaei, Iman A1 - Alseekh, Saleh A1 - Shahid, Mohammad A1 - Leniak, Ewa A1 - Wagner, Mateusz A1 - Mahmoudi, Henda A1 - Thushar, Sumitha A1 - Fernie, Alisdair A1 - Murphy, Kevin M. A1 - Schmöckel, Sandra M. A1 - Tester, Mark A1 - Müller-Röber, Bernd A1 - Skirycz, Aleksandra A1 - Balazadeh, Salma T1 - The diversity of quinoa morphological traits and seed metabolic composition JF - Scientific data N2 - Quinoa (Chenopodium quinoa Willd.) is an herbaceous annual crop of the amaranth family (Amaranthaceae). It is increasingly cultivated for its nutritious grains, which are rich in protein and essential amino acids, lipids, and minerals. Quinoa exhibits a high tolerance towards various abiotic stresses including drought and salinity, which supports its agricultural cultivation under climate change conditions. The use of quinoa grains is compromised by anti-nutritional saponins, a terpenoid class of secondary metabolites deposited in the seed coat; their removal before consumption requires extensive washing, an economically and environmentally unfavorable process; or their accumulation can be reduced through breeding. In this study, we analyzed the seed metabolomes, including amino acids, fatty acids, and saponins, from 471 quinoa cultivars, including two related species, by liquid chromatography - mass spectrometry. Additionally, we determined a large number of agronomic traits including biomass, flowering time, and seed yield. The results revealed considerable diversity between genotypes and provide a knowledge base for future breeding or genome editing of quinoa. Y1 - 2022 U6 - https://doi.org/10.1038/s41597-022-01399-y SN - 2052-4463 VL - 9 IS - 1 PB - Nature Research CY - Berlin ER - TY - JOUR A1 - Durgud, Meriem A1 - Gupta, Saurabh A1 - Ivanov, Ivan A1 - Omidbakhshfard, Mohammad Amin A1 - Benina, Maria A1 - Alseekh, Saleh A1 - Staykov, Nikola A1 - Hauenstein, Mareike A1 - Dijkwel, Paul P. A1 - Hortensteiner, Stefan A1 - Toneva, Valentina A1 - Brotman, Yariv A1 - Fernie, Alisdair A1 - Müller-Röber, Bernd A1 - Gechev, Tsanko S. T1 - Molecular Mechanisms Preventing Senescence in Response to Prolonged Darkness in a Desiccation-Tolerant Plant JF - Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants N2 - The desiccation-tolerant plant Haberlea rhodopensis can withstand months of darkness without any visible senescence. Here, we investigated the molecular mechanisms of this adaptation to prolonged (30 d) darkness and subsequent return to light. H. rhodopensis plants remained green and viable throughout the dark treatment. Transcriptomic analysis revealed that darkness regulated several transcription factor (TF) genes. Stress-and autophagy-related TFs such as ERF8, HSFA2b, RD26, TGA1, and WRKY33 were up-regulated, while chloroplast-and flowering-related TFs such as ATH1, COL2, COL4, RL1, and PTAC7 were repressed. PHYTOCHROME INTERACTING FACTOR4, a negative regulator of photomorphogenesis and promoter of senescence, also was down-regulated. In response to darkness, most of the photosynthesis-and photorespiratory-related genes were strongly down-regulated, while genes related to autophagy were up-regulated. This occurred concomitant with the induction of SUCROSE NON-FERMENTING1-RELATED PROTEIN KINASES (SnRK1) signaling pathway genes, which regulate responses to stress-induced starvation and autophagy. Most of the genes associated with chlorophyll catabolism, which are induced by darkness in dark-senescing species, were either unregulated (PHEOPHORBIDE A OXYGENASE, PAO; RED CHLOROPHYLL CATABOLITE REDUCTASE, RCCR) or repressed (STAY GREEN-LIKE, PHEOPHYTINASE, and NON-YELLOW COLORING1). Metabolite profiling revealed increases in the levels of many amino acids in darkness, suggesting increased protein degradation. In darkness, levels of the chloroplastic lipids digalactosyldiacylglycerol, monogalactosyldiacylglycerol, phosphatidylglycerol, and sulfoquinovosyldiacylglycerol decreased, while those of storage triacylglycerols increased, suggesting degradation of chloroplast membrane lipids and their conversion to triacylglycerols for use as energy and carbon sources. Collectively, these data show a coordinated response to darkness, including repression of photosynthetic, photorespiratory, flowering, and chlorophyll catabolic genes, induction of autophagy and SnRK1 pathways, and metabolic reconfigurations that enable survival under prolonged darkness. Y1 - 2018 U6 - https://doi.org/10.1104/pp.18.00055 SN - 0032-0889 SN - 1532-2548 VL - 177 IS - 3 SP - 1319 EP - 1338 PB - American Society of Plant Physiologists CY - Rockville ER -