Indian Journal of PsychiatryIndian Journal of Psychiatry
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Year : 2019  |  Volume : 61  |  Issue : 7  |  Page : 37-42

Genetics of obsessive-compulsive disorder


1 Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru, Karnataka, India
2 Department of Behavioral Science and Psychiatry, Johns Hopkins University, Baltimore, MD, USA

Correspondence Address:
Dr. Biju Viswanath
Department of Psychiatry, National Institute of Mental Health and Neuro Sciences, Bengaluru - 560 029, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/psychiatry.IndianJPsychiatry_518_18

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Obsessive-compulsive disorder (OCD) has been seen to run in families and genetics help to understand its heritability. In this review, we summarize older studies which focused on establishing the familial nature of OCD, including its various dimensions of symptoms, and we focus on recent findings from studies using both the candidate gene approach and genome-wide association study (GWAS) approach. The family studies and twin studies establish the heritability of OCD. Candidate gene approaches have implicated genes in the serotonergic, glutamatergic, and dopaminergic pathways. GWAS has not produced significant results possibly due to the small sample size. Newer techniques such as gene expression studies in brain tissue, stem cell technology, and epigenetic studies may shed more light on the complex genetic basis of OCD.



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