@article{HohmannHohmTreutleinetal.2015, author = {Hohmann, Sarah and Hohm, Erika and Treutlein, Jens and Blomeyer, Dorothea and Jennen-Steinmetz, Christine and Schmidt, Martin H. and Esser, G{\"u}nter and Banaschewski, Tobias and Brandeis, Daniel and Laucht, Manfred}, title = {Association of norepinephrine transporter (NET, SLC6A2) genotype with ADHD-related phenotypes: Findings of a longitudinal study from birth to adolescence}, series = {Psychiatry research : the official publication of the International Society for Neuroimaging in Psychiatry}, volume = {226}, journal = {Psychiatry research : the official publication of the International Society for Neuroimaging in Psychiatry}, number = {2-3}, publisher = {Elsevier}, address = {Clare}, issn = {0165-1781}, doi = {10.1016/j.psychres.2014.12.029}, pages = {425 -- 433}, year = {2015}, abstract = {Variation in the gene encoding for the norepinephrine transporter (NET, SLC6A2) has repeatedly been linked with ADHD, although there is some inconsistency regarding the association with specific genes. The variants for which most consistent association has been found are the NET variants rs3785157 and rs28386840. Here, we tested for their association with ADHD diagnosis and ADHD-related phenotypes during development in a longitudinal German community sample. Children were followed from age 4 to age 15, using diagnostic interviews to assess ADHD. Between the ages of 8 and 15 years, the Child Behavior Checklist (CBCL) was administered to the primary caregivers. The continuous performance task (CPT) was performed at age 15. Controlling for possible confounders, we found that homozygous carriers of the major A allele of the functional promoter variant rs28386840 displayed a higher rate of ADHD lifetime diagnosis. Moreover, homozygous carriers of the minor T allele of rs3785157 were more likely to develop ADHD and showed higher scores on the CBCL externalizing behavior scales. Additionally, we found that individuals heterozygous for rs3785157 made fewer omission errors in the CPT than homozygotes. This is the first longitudinal study to report associations between specific NET variants and ADHD-related phenotypes during the course of development. (C) 2015 Elsevier Ireland Ltd. All rights reserved.}, language = {en} } @article{BuchmannHohmWittetal.2015, author = {Buchmann, Arlette F. and Hohm, Erika and Witt, Stephanie H. and Blomeyer, Dorothea and Jennen-Steinmetz, Christine and Schmidt, Martin H. and Esser, G{\"u}nter and Banaschewski, Tobias and Brandeis, Daniel and Laucht, Manfred}, title = {Role of CNR1 polymorphisms in moderating the effects of psychosocial adversity on impulsivity in adolescents}, series = {Journal of neural transmission}, volume = {122}, journal = {Journal of neural transmission}, number = {3}, publisher = {Springer}, address = {Wien}, issn = {0300-9564}, doi = {10.1007/s00702-014-1266-3}, pages = {455 -- 463}, year = {2015}, abstract = {Enhanced endocannabinoid signaling has been implicated in typically adolescent behavioral features such as increased risk-taking, impulsivity and novelty seeking. Research investigating the impact of genetic variants in the cannabinoid receptor 1 gene (CNR1) and of early rearing conditions has demonstrated that both factors contribute to the prediction of impulsivity-related phenotypes. The present study aimed to test the hypothesis of an interaction of the two most studied CNR1 polymorphisms rs806379 and rs1049353 with early psychosocial adversity in terms of affecting impulsivity in 15-year-olds from an epidemiological cohort sample followed since birth. In 323 adolescents (170 girls, 153 boys), problems of impulse control and novelty seeking were assessed using parent-report and self-report, respectively. Exposure to early psychosocial adversity was determined in a parent interview conducted at the age of 3 months. The results indicated that impulsivity increased following exposure to early psychosocial adversity, with this increase being dependent on CNR1 genotype. In contrast, while individuals exposed to early adversity scored higher on novelty seeking, no significant impact of genotype or the interaction thereof was detected. This is the first evidence to suggest that the interaction of CNR1 gene variants with the experience of early life adversity may play a role in determining adolescent impulsive behavior. However, given that the reported findings are obtained in a high-risk community sample, results are restricted in terms of interpretation and generalization. Future research is needed to replicate these findings and to identify the mediating mechanisms underlying this effect.}, language = {en} } @article{HolzBoeckerSchlierHohmetal.2015, author = {Holz, Nathalie E. and Boecker-Schlier, Regina and Hohm, Erika and Zohsel, Katrin and Buchmann, Arlette F. and Blomeyer, Dorothea and Jennen-Steinmetz, Christine and Baumeister, Sarah and Hohmann, Sarah and Wolf, Isabella and Plichta, Michael M. and Esser, G{\"u}nter and Schmidt, Martin and Meyer-Lindenberg, Andreas and Banaschewski, Tobias and Brandeis, Daniel and Laucht, Manfred}, title = {The Long-Term Impact of Early Life Poverty on Orbitofrontal Cortex Volume in Adulthood: Results from a Prospective Study Over 25 Years}, series = {Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology}, volume = {40}, journal = {Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology}, number = {4}, publisher = {Nature Publ. Group}, address = {London}, issn = {0893-133X}, doi = {10.1038/npp.2014.277}, pages = {996 -- 1004}, year = {2015}, abstract = {Converging evidence has highlighted the association between poverty and conduct disorder (CD) without specifying neurobiological pathways. Neuroimaging research has emphasized structural and functional alterations in the orbitofrontal cortex (OFC) as one key mechanism underlying this disorder. The present study aimed to clarify the long-term influence of early poverty on OFC volume and its association with CD symptoms in healthy participants of an epidemiological cohort study followed since birth. At age 25 years, voxel-based morphometry was applied to study brain volume differences. Poverty (0 = non-exposed (N = 134), I = exposed (N = 33)) and smoking during pregnancy were determined using a standardized parent interview, and information on maternal responsiveness was derived from videotaped mother infant interactions at the age of 3 months. CD symptoms were assessed by diagnostic interview from 8 to 19 years of age. Information on life stress was acquired at each assessment and childhood maltreatment was measured using retrospective self-report at the age of 23 years. Analyses were adjusted for sex, parental psychopathology and delinquency, obstetric adversity, parental education, and current poverty. Individuals exposed to early life poverty exhibited a lower OFC volume. Moreover, we replicated previous findings of increased CD symptoms as a consequence of childhood poverty. This effect proved statistically mediated by OFC volume and exposure to life stress and smoking during pregnancy, but not by childhood maltreatment and maternal responsiveness. These findings underline the importance of studying the impact of early life adversity on brain alterations and highlight the need for programs to decrease income-related disparities.}, language = {en} }