Journal
BIOLOGICAL PSYCHIATRY
Volume 72, Issue 8, Pages 629-636Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.biopsych.2012.03.037
Keywords
Genetics; genome-wide; linkage; multigenerational; obsessive-compulsive; pedigree
Categories
Funding
- National Center for Research Resources [K23 RR015533]
- National Alliance for Research on Schizophrenia and Affective Disorders
- Obsessive Compulsive Foundation
- Althea Foundation
- National Institute of Mental Health [K20MH01065, R01MH58376, K01 MH072952]
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Background: Obsessive-compulsive disorder (OCD) has a complex etiology involving both genetic and environmental factors. However, the genetic causes of OCD are largely unknown, despite the identification of several promising candidate genes and linkage regions. Methods: Our objective was to conduct genetic linkage studies of the type of OCD thought to have the strongest genetic etiology (i.e., childhood-onset OCD), in 33 Caucasian families with >= 2 childhood-onset OCD-affected individuals from the United States (n = 245 individuals with genotype data). Parametric and nonparametric genome-wide linkage analyses were conducted with Morgan and Merlin in these families using a selected panel of single nucleotide repeat polymorphisms from the Illumina 610-Quad Bead Chip. The initial analyses were followed by fine-mapping analyses in genomic regions with initial heterogeneity logarithm of odds (HLOD) scores of >= 2.0. Results: We identified five areas of interest (HLOD score >= 2) on chromosomes 1p36, 2p14, 5q13, 6p25, and 10p13. The strongest result was on chromosome 1p36.33-p36.32 (HLOD = 3.77, suggestive evidence for linkage after fine mapping). At this location, several of the families showed haplotypes co-segregating with OCD. Conclusions: The results of this study represent the strongest linkage finding for OCD in a primary analysis to date and suggest that chromosome 1p36, and possibly several other genomic regions, may harbor susceptibility loci for OCD. Multiple brain-expressed genes lie under the primary linkage peak (approximately 4 megabases in size). Follow-up studies, including replication in additional samples and targeted sequencing of the areas of interest, are needed to confirm these findings and to identify specific OCD risk variants.
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