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BDNF Val66Met genotype and 6-month remission rates in late-life depression

Abstract

Although not observed in younger adult cohorts, in older individuals the brain-derived neurotrophic factor (BDNF) Val66Met polymorphism is associated with major depressive disorder (MDD) risk. It is further associated with subjective social support and magnetic resonance imaging (MRI) hyperintense lesions, clinical features independently related to MDD. We examined the relationship between this polymorphism and antidepressant remission rates in an elderly sample with MDD, while also testing for mediation effects of social support and hyperintensities. A total of 229 elderly Caucasian subjects with MDD completed baseline assessments, 1.5 T MRI, and BDNF genotyping. They received antidepressant medication under a structured treatment algorithm and were evaluated for remission at 3 and 6 months. At the 3-month evaluation, BDNF Val66Met genotype was not associated with remission (Wald's χ2=2.51, P=0.1131). When not controlling for multiple comparisons, Met66 allele carriers were more likely to be remitted at 6 months (χ2=4.32, P=0.0377) with an odds ratio of 1.82 (95% CI: 1.04, 3.22). This effect persisted after controlling for lesion volume and social support, neither of which mediated this relationship. Thus in this exploratory analysis, the Met66 allele may be associated with increased odds of remission in older subjects, but also with increased time to remission as there was no 3-month effect.

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Acknowledgements

This study was supported by NIMH Grants R01 MH054846-14, R01 MH078216-03, and P50 MH60451-09. We thank Martha Payne and Denise Messer for MR analysis methods and image processing.

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Correspondence to W D Taylor.

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Dr Taylor, Dr Ashely-Koch and Dr MacFall, and Mr McQuoid and Ms Bridgers have no conflicts to report. Dr Steffens reports receiving consultancy fees from TransForm Pharmaceuticals Inc. and speaking fees from Forest Pharmaceuticals and Wyeth Pharmaceuticals. Dr Krishnan has received consultancy fees from CeNeRx, Corcept, GlaxoSmithKline, Johnson & Johnson, Merck, Roche and Sonexa. He has ownership interest in Orexigen, CeNeRx and Sonexa.

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Taylor, W., McQuoid, D., Ashley-Koch, A. et al. BDNF Val66Met genotype and 6-month remission rates in late-life depression. Pharmacogenomics J 11, 146–154 (2011). https://doi.org/10.1038/tpj.2010.12

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