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

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State: Public
Version: author
Serval ID
serval:BIB_9FBA8B7A13F7
Type
Article: article from journal or magazin.
Collection
Publications
Title
Familiality and SNP heritability of age at onset and episodicity in major depressive disorder.
Journal
Psychological medicine
Author(s)
Ferentinos P., Koukounari A., Power R., Rivera M., Uher R., Craddock N., Owen M.J., Korszun A., Jones L., Jones I., Gill M., Rice J.P., Ising M., Maier W., Mors O., Rietschel M., Preisig M., Binder E.B., Aitchison K.J., Mendlewicz J., Souery D., Hauser J., Henigsberg N., Breen G., Craig I.W., Farmer A.E., Müller-Myhsok B., McGuffin P., Lewis C.M.
ISSN
1469-8978 (Electronic)
ISSN-L
0033-2917
Publication state
Published
Issued date
07/2015
Peer-reviewed
Oui
Volume
45
Number
10
Pages
2215-2225
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
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).
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.
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.
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.

Keywords
Adolescent, Adult, Age of Onset, Aged, Aged, 80 and over, Depressive Disorder, Major/genetics, Female, Genetic Predisposition to Disease, Genotype, Germany, Humans, Interviews as Topic, Linear Models, Male, Middle Aged, Phenotype, Polymorphism, Genetic, Siblings, United Kingdom, Young Adult
Pubmed
Open Access
Yes
Create date
10/03/2015 11:38
Last modification date
20/08/2019 16:05
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