Whole-Exome Sequencing in OCD and Chronic Tic Disorders Identifies 36 Large-Effect Risk Genes
Original title: Whole-exome sequencing in individuals with obsessive–compulsive disorder and chronic tic disorders identifies 36 large-effect risk genes
Researchers analyzed whole-exome sequencing data from 3,964 people with obsessive–compulsive disorder, chronic tic disorders, or both. The case cohort included 2,418 parent–child trios and 1,546 singleton cases, with additional control groups.
Across separate and combined analyses, 36 genes met the study's high-confidence threshold. Thirty of those genes had evidence contributed by both OCD and chronic tic disorder cases, supporting substantial shared genetic risk between the conditions.
The researchers estimated that rare damaging variants of the types studied contribute to risk in only a minority of affected individuals. The work expands the map of large-effect genetic risk but does not establish a single causal gene, a clinical genetic test, or a new treatment.
Why we referenced it
This study provides unusually large-scale evidence about rare, protein-coding genetic variants associated with OCD and chronic tic disorders, including Tourette disorder, and helps clarify where their genetic architecture overlaps.
Important context
The study focuses on rare coding variants and does not capture the full genetic architecture of OCD or chronic tic disorders. Singleton analyses were restricted to European genetic ancestry, many samples had appeared in earlier studies, and several exploratory analyses require additional replication. Association with risk does not mean a variant determines whether a person will develop a condition.