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ABSTRACT: Background
The prevalence of depression is higher in individuals with autoimmune diseases, but the mechanisms underlying the observed comorbidities are unknown. Shared genetic etiology is a plausible explanation for the overlap, and in this study we tested whether genetic variation in the major histocompatibility complex (MHC), which is associated with risk for autoimmune diseases, is also associated with risk for depression.Methods
We fine-mapped the classical MHC (chr6: 29.6-33.1 Mb), imputing 216 human leukocyte antigen (HLA) alleles and 4 complement component 4 (C4) haplotypes in studies from the Psychiatric Genomics Consortium Major Depressive Disorder Working Group and the UK Biobank. The total sample size was 45,149 depression cases and 86,698 controls. We tested for association between depression status and imputed MHC variants, applying both a region-wide significance threshold (3.9 × 10-6) and a candidate threshold (1.6 × 10-4).Results
No HLA alleles or C4 haplotypes were associated with depression at the region-wide threshold. HLA-B*08:01 was associated with modest protection for depression at the candidate threshold for testing in HLA genes in the meta-analysis (odds ratio = 0.98, 95% confidence interval = 0.97-0.99).Conclusions
We found no evidence that an increased risk for depression was conferred by HLA alleles, which play a major role in the genetic susceptibility to autoimmune diseases, or C4 haplotypes, which are strongly associated with schizophrenia. These results suggest that any HLA or C4 variants associated with depression either are rare or have very modest effect sizes.
SUBMITTER: Glanville KP
PROVIDER: S-EPMC7001040 | biostudies-literature | 2020 Mar
REPOSITORIES: biostudies-literature
Glanville Kylie P KP Coleman Jonathan R I JRI Hanscombe Ken B KB Euesden Jack J Choi Shing Wan SW Purves Kirstin L KL Breen Gerome G Air Tracy M TM Andlauer Till F M TFM Baune Bernhard T BT Binder Elisabeth B EB Blackwood Douglas H R DHR Boomsma Dorret I DI Buttenschøn Henriette N HN Colodro-Conde Lucía L Dannlowski Udo U Direk Nese N Dunn Erin C EC Forstner Andreas J AJ de Geus Eco J C EJC Grabe Hans J HJ Hamilton Steven P SP Jones Ian I Jones Lisa A LA Knowles James A JA Kutalik Zoltán Z Levinson Douglas F DF Lewis Glyn G Lind Penelope A PA Lucae Susanne S Magnusson Patrik K PK McGuffin Peter P McIntosh Andrew M AM Milaneschi Yuri Y Mors Ole O Mostafavi Sara S Müller-Myhsok Bertram B Pedersen Nancy L NL Penninx Brenda W J H BWJH Potash James B JB Preisig Martin M Ripke Stephan S Shi Jianxin J Shyn Stanley I SI Smoller Jordan W JW Streit Fabian F Sullivan Patrick F PF Tiemeier Henning H Uher Rudolf R Van der Auwera Sandra S Weissman Myrna M MM O'Reilly Paul F PF Lewis Cathryn M CM
Biological psychiatry 20190805 5
<h4>Background</h4>The prevalence of depression is higher in individuals with autoimmune diseases, but the mechanisms underlying the observed comorbidities are unknown. Shared genetic etiology is a plausible explanation for the overlap, and in this study we tested whether genetic variation in the major histocompatibility complex (MHC), which is associated with risk for autoimmune diseases, is also associated with risk for depression.<h4>Methods</h4>We fine-mapped the classical MHC (chr6: 29.6-33 ...[more]