Human Molecular Genetics Advance Access originally published online on August 22, 2005
Human Molecular Genetics 2005 14(19):2829-2837; doi:10.1093/hmg/ddi315
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The soluble epoxide hydrolase gene harbors sequence variation associated with susceptibility to and protection from incident ischemic stroke
1Institute of Molecular Medicine for the Prevention of Human Diseases, University of Texas Health Science Center, Houston, TX, USA, 2Division of Pharmacotherapy and Experimental Therapeutics, School of Pharmacy and 3Department of Epidemiology, School of Public Health, The University of North Carolina at Chapel Hill, NC, USA, 4Division of Intramural Research, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA and 5Department of Pediatrics, Children's Nutrition Research Center, Baylor College of Medicine, Houston, TX, USA
* To whom correspondence should be addressed at: Institute of Molecular Medicine for the Prevention of Human Diseases, University of Texas Health Science Center, Houston, 2121 W. Holcombe Boulevard, Houston, TX 77030, USA. Tel: +1 7135002463; Fax: +1 7135002424; Email: myriam.fornage{at}uth.tmc.edu
Received June 23, 2005; Revised August 2, 2005; Accepted August 10, 2005
Stroke is the leading cause of severe disability and the third leading cause of death, accounting for one of every 15 deaths in the USA. We investigated the association of polymorphisms in the soluble epoxide hydrolase gene (EPHX2) with incident ischemic stroke in African-Americans and Whites. Twelve single nucleotide polymorphisms (SNPs) spanning EPHX2 were genotyped in a case-cohort sample of 1336 participants from the Atherosclerosis Risk in Communities (ARIC) study. In each racial group, Cox proportional hazard models were constructed to assess the relationship between incident ischemic stroke and EPHX2 polymorphisms. A score test method was used to investigate the association of common haplotypes of the gene with risk of ischemic stroke. In African-Americans, two common EPHX2 haplotypes with significant and opposing relationships to ischemic stroke risk were identified. In Whites, two common haplotypes showed suggestive indication of an association with ischemic stroke risk but, as in African-Americans, these relationships were in opposite direction. These findings suggest that multiple variants exist within or near the EPHX2 gene, with greatly contrasting relationships to ischemic stroke incidence; some associated with a higher incidence and others with a lower incidence.
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