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Familiality and SNP Heritability of Age at Onset and Episodicity in Major Depressive Disorder

Ferentinos, P. and Koukounari, A. and Power, R. and Rivera, M. and Uher, R. and Craddock, N. and Owen, M.J. and Korszun, A. and Jones, Lisa and Jones, I. and Gill, M. and Rice, J.P. and Ising, M. and Maier, W. and Mors, O. and Rietschel, M. and Preisig, M. and Binder, E.B. and Aitchison, K.J. and Mendlewicz, J. and Souery, D. and Hauser, J. and Henigsberg, N. and Breen, G. and Craig, I.W. and Farmer, A.E. and Muller-Myhsok, B. and McGuffin, P. and Lewis, C.M. (2015) Familiality and SNP Heritability of Age at Onset and Episodicity in Major Depressive Disorder. Psychological Medicine, 45 (10). pp. 2215-2225. ISSN Print:0033-2917 Online: 1469-8978

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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.

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Uncontrolled Keywords: age at onset, episodicity, familiality, genome-wide complex trait analysis (GCTA), heritability, major depression
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Academic Departments > Institute of Health and Society
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Copyright Info: Open Access article
Depositing User: Lisa Jones
Date Deposited: 30 Oct 2015 09:14
Last Modified: 30 Oct 2015 09:14
URI: https://eprints.worc.ac.uk/id/eprint/4026

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