Investigating shared aetiology between type 2 diabetes and major depressive disorder in a population based cohort

Clarke, T.-K. et al. (2017) Investigating shared aetiology between type 2 diabetes and major depressive disorder in a population based cohort. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 174(3), pp. 227-234. (doi: 10.1002/ajmg.b.32478) (PMID:27480393) (PMCID:PMC5363226)

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Abstract

Type II diabetes (T2D) and major depressive disorder (MDD) are often co-morbid. The reasons for this co-morbidity are unclear. Some studies have highlighted the importance of environmental factors and a causal relationship between T2D and MDD has also been postulated. In the present study we set out to investigate the shared aetiology between T2D and MDD using Mendelian randomization in a population based sample, Generation Scotland: the Scottish Family Health Study (N = 21,516). Eleven SNPs found to be associated with T2D were tested for association with MDD and psychological distress (General Health Questionnaire scores). We also assessed causality and genetic overlap between T2D and MDD using polygenic risk scores (PRS) assembled from the largest available GWAS summary statistics to date. No single T2D risk SNP was associated with MDD in the MR analyses and we did not find consistent evidence of genetic overlap between MDD and T2D in the PRS analyses. Linkage disequilibrium score regression analyses supported these findings as no genetic correlation was observed between T2D and MDD (rG = 0.0278 (S.E. 0.11), P-value = 0.79). As suggested by previous studies, T2D and MDD covariance may be better explained by environmental factors. Future studies would benefit from analyses in larger cohorts where stratifying by sex and looking more closely at MDD cases demonstrating metabolic dysregulation is possible.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padmanabhan, Professor Sandosh
Authors: Clarke, T.-K., Obsteter, J., Hall, L. S., Hayward, C., Thomson, P. A., Smith, B. H., Padmanabhan, S., Hocking, L. J., Deary, I. H., Porteous, D. J., and McIntosh, A. M.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:American Journal of Medical Genetics Part B: Neuropsychiatric Genetics
Publisher:Wiley
ISSN:1552-4841
ISSN (Online):1552-485X
Published Online:02 August 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in American Journal of Medical Genetics Part B: Neuropsychiatric Genetics 174(3): 227-234
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
381721Generation ScotlandAnna DominiczakScottish Executive Health Department (SEHHD-CSO)CZD/16/6RI CARDIOVASCULAR & MEDICAL SCIENCES