Format

Send to

Choose Destination
Am J Med Genet B Neuropsychiatr Genet. 2019 Sep;180(6):351-364. doi: 10.1002/ajmg.b.32687. Epub 2018 Nov 20.

Sex differences in the genetic architecture of obsessive-compulsive disorder.

Author information

1
Section of Genetic Medicine, Department of Medicine, University of Chicago, Chicago, Illinois.
2
Institute for Genomics and Systems Biology, University of Chicago, Chicago, Illinois.
3
University of California, Berkeley, California.
4
Queensland Institute of Medical Research, Brisbane, Australia.
5
Psychiatric and Neurodevelopmental Genetics Unit, Center for Genomic Medicine, Department of Psychiatry, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts.
6
Vanderbilt Genetics Institute; Vanderbilt University Medical Center, Nashville, Tennessee.
7
Division of Medical Genetics, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
8
Department of Psychiatry and Behavioral Sciences, Vanderbilt University Medical Center, Nashville, Tennessee.
9
Center for Data Intensive Science, University of Chicago, Chicago, Illinois.

Abstract

Obsessive-compulsive disorder (OCD) is a highly heritable complex phenotype that demonstrates sex differences in age of onset and clinical presentation, suggesting a possible sex difference in underlying genetic architecture. We present the first genome-wide characterization of the sex-specific genetic architecture of OCD, utilizing the largest set of OCD cases and controls available from the Psychiatric Genomics Consortium. We assessed evidence for several mechanisms that may contribute to sex differences including a sex-dependent liability threshold, the presence of individual sex-specific risk variants on the autosomes and the X chromosome, and sex-specific pleiotropic effects. Furthermore, we tested the hypothesis that genetic heterogeneity between the sexes may obscure associations in a sex-combined genome-wide association study. We observed a strong genetic correlation between male and female OCD and no evidence for a sex-dependent liability threshold model, suggesting that sex-combined analysis does not suffer from widespread loss of power because of genetic heterogeneity between the sexes. While we did not detect any significant sex-specific genome-wide single nucleotide polymorphisms (SNP) associations, we did identify two significant gene-based associations in females: GRID2 and GRP135, which showed no association in males. We observed that the SNPs with sexually differentiated effects showed an enrichment of regulatory variants influencing expression of genes in brain and immune tissues. These findings suggest that future studies with larger sample sizes hold great promise for the identification of sex-specific genetic risk factors for OCD.

KEYWORDS:

genetics; genome-wide association study; obsessive compulsive disorder; sex differences; sex-specific analysis; sex-specific genetic architecture

PMID:
30456828
PMCID:
PMC6527502
[Available on 2020-09-01]
DOI:
10.1002/ajmg.b.32687

Grant support

Grant support

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center