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Genome-wide analyses identify 30 loci associated with obsessive-compulsive disorder.

Nora I Strom1,2,3,4,5, Zachary F Gerring6,7, Marco Galimberti8,9

  • 1Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany. nora.strom@hu-berlin.de.

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Summary
This summary is machine-generated.

This large genetic study identified 30 new genome-wide significant loci for obsessive-compulsive disorder (OCD). OCD genetic risk is linked to specific brain cells and shares genetic factors with many psychiatric disorders.

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Area of Science:

  • Genetics
  • Neuroscience
  • Psychiatry

Background:

  • Obsessive-compulsive disorder (OCD) affects approximately 1% of the population.
  • Genetic factors play a significant role in the etiology of OCD.

Purpose of the Study:

  • To identify genetic loci associated with obsessive-compulsive disorder (OCD).
  • To investigate the genetic architecture and shared genetic risks of OCD with other phenotypes.

Main Methods:

  • Conducted a genome-wide association study (GWAS) meta-analysis of 53,660 OCD cases and 2,044,417 controls.
  • Utilized gene-based approaches to identify potential effector genes.
  • Estimated the number of genetic variants contributing to OCD heritability.

Main Results:

  • Identified 30 independent genome-wide significant loci for OCD.
  • Pinpointed 249 potential effector genes, with 25 identified as likely causal candidates, including WDR6, DALRD3, CTNND1, and MHC region genes.
  • Estimated that approximately 11,500 genetic variants explain 90% of OCD heritability.
  • Found OCD genetic risk associated with excitatory neurons in the hippocampus and cortex, and dopamine receptor-containing medium spiny neurons.
  • Observed shared genetic risk between OCD and 65 other phenotypes, including psychiatric disorders like anxiety, depression, anorexia nervosa, and Tourette syndrome.
  • Identified negative genetic correlations between OCD and inflammatory bowel diseases, educational attainment, and body mass index.

Conclusions:

  • This study significantly expands the understanding of the genetic underpinnings of OCD.
  • The findings highlight the role of specific neuronal populations and dopamine pathways in OCD.
  • Genetic risk for OCD is substantially shared with other psychiatric conditions, suggesting common biological pathways.