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The BDNF Val(66)Met x 5-HTTLPR x child adversity interaction and depressive symptoms: An attempt at replication.

Kaufman et al. [2006] reported a higher order interaction effect between specific genetic and environmental factors in a model of depressive symptoms, requiring independent replication. BDNF Val(66)Met and 5-HTTLPR genotypes were determined in female participants pertaining to a large ongoing twin study. Participants also filled in questionnaires on childhood adversity and depressive symptoms. Two- and three-way interactions between genetic polymorphisms and early adversity were examined in models of depressive symptoms. BDNF Met allele(s) moderated the effect of early adversity on depressive symptoms (two-way interaction), and this BDNF Met x childhood adversity interaction in turn was moderated by 5-HTTLPR genotype (three-way interaction). However, a main effect of BDNF Met on childhood adversity was also observed, possibly indicating confounding by gene-environment correlation. Higher order interaction effects involving BDNF Val(66)Met, 5-HTTLPR and childhood adversity may contribute to the etiology of depressive illness.[1]

References

  1. The BDNF Val(66)Met x 5-HTTLPR x child adversity interaction and depressive symptoms: An attempt at replication. Wichers, M., Kenis, G., Jacobs, N., Mengelers, R., Derom, C., Vlietinck, R., van Os, J. Am. J. Med. Genet. B Neuropsychiatr. Genet. (2008) [Pubmed]
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