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Familiality and SNP heritability of age at onset and episodicity in major depressive disorder.

Abstract：

BACKGROUND:Strategies to dissect phenotypic and genetic heterogeneity of major depressive disorder (MDD) have mainly relied on subphenotypes, such as age at onset (AAO) and recurrence/episodicity. Yet, evidence on whether these subphenotypes are familial or heritable is scarce. The aims of this study are to investigate the familiality of AAO and episode frequency in MDD and to assess the proportion of their variance explained by common single nucleotide polymorphisms (SNP heritability). METHOD:For investigating familiality, we used 691 families with 2-5 full siblings with recurrent MDD from the DeNt study. We fitted (square root) AAO and episode count in a linear and a negative binomial mixed model, respectively, with family as random effect and adjusting for sex, age and center. The strength of familiality was assessed with intraclass correlation coefficients (ICC). For estimating SNP heritabilities, we used 3468 unrelated MDD cases from the RADIANT and GSK Munich studies. After similarly adjusting for covariates, derived residuals were used with the GREML method in GCTA (genome-wide complex trait analysis) software. RESULTS:Significant familial clustering was found for both AAO (ICC = 0.28) and episodicity (ICC = 0.07). We calculated from respective ICC estimates the maximal additive heritability of AAO (0.56) and episodicity (0.15). SNP heritability of AAO was 0.17 (p = 0.04); analysis was underpowered for calculating SNP heritability of episodicity. CONCLUSIONS:AAO and episodicity aggregate in families to a moderate and small degree, respectively. AAO is under stronger additive genetic control than episodicity. Larger samples are needed to calculate the SNP heritability of episodicity. The described statistical framework could be useful in future analyses.

journal_name

Psychol Med

journal_title

Psychological medicine

authors

Ferentinos P,Koukounari A,Power R,Rivera M,Uher R,Craddock N,Owen MJ,Korszun A,Jones L,Jones I,Gill M,Rice JP,Ising M,Maier W,Mors O,Rietschel M,Preisig M,Binder EB,Aitchison KJ,Mendlewicz J,Souery D,Hauser J,

doi

10.1017/S0033291715000215

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

2215-25

issue

eissn

0033-2917

issn

1469-8978

pii

S0033291715000215

journal_volume

pub_type

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Familiality and SNP heritability of age at onset and episodicity in major depressive disorder.