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Type: Journal article
Title: Dissecting the genetic heterogeneity of depression through age at onset
Author: Power, R.
Cohen-Woods, S.
Citation: American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 2012; 159(7):859-868
Publisher: Wiley-Liss
Issue Date: 2012
ISSN: 1552-4841
Statement of
Robert A. Power...Sarah Cohen-Woods... et al.
Abstract: Genome-wide studies in major depression have identified few replicated associations, potentially due to heterogeneity within the disorder. Several studies have suggested that age at onset (AAO) can distinguish sub-types of depression with specific heritable components. This paper investigates the role of AAO in the genetic susceptibility for depression using genome-wide association data on 2,746 cases and 1,594 screened controls from the RADIANT studies, with replication performed in 1,471 cases and 1,403 controls from two Munich studies. Three methods were used to analyze AAO: First a time-to-event analysis with controls censored, secondly comparing controls to case-subsets defined using AAO cut-offs, and lastly analyzing AAO as a quantitative trait. In the time-to-event analysis three SNPs reached suggestive significance (P < 5E-06), overlapping with the original case-control analysis of this study. In a case-control analysis using AAO thresholds, SNPs in 10 genomic regions showed suggestive association though again none reached genome-wide significance. Lastly, case-only analysis of AAO as a quantitative trait resulted in 5 SNPs reaching suggestive significance. Sex specific analysis was performed as a secondary analysis, yielding one SNP reaching genome-wide significance in early-onset males. No SNPs achieved significance in the replication study after correction for multiple testing. Analysis of AAO as a quantitative trait did suggest that, across all SNPs, common genetic variants explained a large proportion of the variance (51%, P = 0.04). This study provides the first focussed analysis of the genetic contribution to AAO in depression, and establishes a statistical framework that can be applied to a quantitative trait underlying any disorder.
Keywords: Humans
Genetic Predisposition to Disease
Case-Control Studies
Depressive Disorder, Major
Age of Onset
Genetic Heterogeneity
Polymorphism, Single Nucleotide
Genome-Wide Association Study
Rights: © 2012 Wiley Periodicals, Inc.
DOI: 10.1002/ajmg.b.32093
Appears in Collections:Aurora harvest 4
Psychiatry publications

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