@article{BeckerBlomeyerElFaddaghetal.2010,
  author    = {Becker, Katja and Blomeyer, Dorothea and El-Faddagh, Mahha and Esser, G{\"u}nter and Schmidt, Martin H. and Banaschewski, Tobias and Laucht, Manfred},
  title     = {From regulatory problems in infancy to attention-deficit/hyperactivity disorder in childhood : a moderating role for the dopamine D4 receptor gene?},
  issn      = {0022-3476},
  doi       = {10.1016/j.jpeds.2009.12.005},
  year      = {2010},
  abstract  = {To examine whether the dopamine receptor D4 gene (DRD4) exon III VNTR moderates the risk of infants with regulatory disorders for developing attention-deficit/hyperactivity disorder (ADHD) later in childhood. In a prospective longitudinal study of children at risk for later psychopathology, 300 participants were assessed for regulatory problems in infancy, DRD4 genotype, and ADHD symptoms and diagnoses from childhood to adolescence. To examine a potential moderating effect on ADHD measures, linear and logistic regressions were computed. Models were fit for the main effects of the DRD4 genotype (presence or absence of the 7r allele) and regulatory problems (presence or absence), with the addition of the interaction term. All models were controlled for sex, family adversity, and obstetric risk status. In children without the DRD4-7r allele, a history of regulatory problems in infancy was unrelated to later ADHD. But in children with regulatory problems in infancy, the additional presence of the DRD4-7r allele increased the risk for ADHD in childhood. The DRD4 genotype seems to moderate the association between regulatory problems in infancy and later ADHD. A replication study is needed before further conclusions can be drawn, however.},
  language  = {en}
}
@article{BeckerElFaddaghSchmidtetal.2008,
  author    = {Becker, Katja and El-Faddagh, Mahha and Schmidt, Martin H. and Esser, G{\"u}nter and Laucht, Manfred},
  title     = {Interaction of dopamine transporter genotype with prenatal smoke exposure on ADHD symptoms},
  issn      = {0022-3476},
  year      = {2008},
  abstract  = {Objective To demonstrate that children homozygous for the 10-repeat allele of the common dopamine transporter (DAT1) polymorphism who were exposed to maternal prenatal smoke exhibited significantly higher hyperactivity-impulsivity than children without these environmental or genetic risks. Study design We performed a prospective longitudinal study from birth into early adulthood monitoring the long-term outcome of early risk factors. Maternal prenatal smoking was determined during a standardized interview with the mother when the child was 3 months old. At age 15 years, 305 adolescents participated in genotyping for the DAT1 40 base pair variable number of tandem repeats polymorphism and assessment of inattention, hyperactivity-impulsivity, and oppositional defiant/conduct disorder symptoms with die Kiddie- Sads-Present and Lifetime Version. Results There was no bivariate association between DAT1 genotype, prenatal smoke exposure and symptoms of attention deficit hyperactivity disorder. However, a significant interaction between DAT1 genotype and prenatal smoke exposure emerged (P =.012), indicating that males with prenatal smoke exposure who were homozygous for the DAT1 10r allele had higher hyperactivity-impulsivity than males from all other groups. In females, no significant main effects of DAT1 genotype or prenatal smoke exposure or interaction effects on any symptoms were evident (all P >.25). Conclusions This study provides further evidence for the multifactorial nature of attention deficit hyperactivity disorder and the importance of studying both genetic and environmental factors and their interaction.},
  language  = {en}
}
@inproceedings{LauchtBlomeyerElFaddaghetal.2011,
  author    = {Laucht, Manfred and Blomeyer, Dorothea and El-Faddagh, Mahha and Esser, G{\"u}nter and Schmidt, Martin and Banaschewski, Tobias and Becker, Katja},
  title     = {Are regulatory problems in infancy precursors of ADHD in childhood? a moderating role for the dopamine D4 receptor gene},
  series = {Infant mental health journal},
  volume    = {32},
  booktitle = {Infant mental health journal},
  number    = {3},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {0163-9641},
  pages     = {212 -- 212},
  year      = {2011},
  language  = {en}
}