4.7 Article

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

期刊

PSYCHOLOGICAL MEDICINE
卷 45, 期 10, 页码 2215-2225

出版社

CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0033291715000215

关键词

Age at onset; episodicity; familiality; GCTA; heritability; major depression

资金

  1. Medical Research Council, UK [G0701420]
  2. GlaxoSmithKline [G0701420]
  3. National Institute for Health Research (NIHR) Biomedical Research Centre for Mental Health at the South London and Maudsley NHS Foundation Trust and King's College London
  4. German Federal Ministry of Education and Research
  5. UK NIHR of the Department of Health
  6. NIHR/BRC
  7. European Commission [LSHB-CT-2003-503428, 115008]
  8. Government of Alberta
  9. Lundbeck Foundation [R155-2014-1724] Funding Source: researchfish
  10. Medical Research Council [MR/L010305/1, G9817803B, G0701420] Funding Source: researchfish
  11. MRC [G0701420] Funding Source: UKRI

向作者/读者索取更多资源

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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