Background: The role of host genetics in the development of subclinical atherosclerosis in the context of HIV-infected persons who are being treated with highly active antiretroviral therapy (HAART) is not well understood.
Methods: The present genome-wide association study (GWAS) is based on 177 HIV-positive Caucasian males receiving HAART who participated in the Fat Redistribution and Metabolic Change in HIV Infection (FRAM) Study. Common and internal carotid intima–media thicknesses (cIMT) measured by B-mode ultrasound were used as a subclinical measure of atherosclerosis. Single nucleotide polymorphisms (SNPs) were assayed using the Illumina HumanCNV370-quad beadchip. Copy Number Variants (CNV) were inferred using a hidden Markov Model (PennCNV). Regression analyses were used to assess the association of common and internal cIMT with individual SNPs and CNVs, adjusting for age, duration of antiretroviral treatment, and principal components to account for potential population stratification.
Results: Two SNPs in tight linkage disequilibrium, rs2229116 (a missense, nonsynonymous polymorphism (IIe to Val)) and rs7177922, located in the ryanodine receptor (RYR3) gene on chromosome 15 were significantly associated with common cIMT (P-value < 1.61 × 10−7). The RYR gene family has been known to play a role in the etiology of cardiovascular disease and has been shown to be regulated by HIV TAT protein.
Conclusion: These results suggest that in the context of HIV infection and HAART, a functional SNP in a biologically plausible candidate gene, RYR3, is associated with increased common carotid IMT, which is a surrogate for atherosclerosis.
aDepartment of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, USA
bPediatrics, School of Medicine, University of California Los Angeles, Los Angeles, California, USA
cDepartment of Biostatistics, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, USA
dMedical Genetics Institute, Cedars-Sinai Medical Center, University of California, Los Angeles, California, USA
eDepartment of Biostatistics, University of Washington, Seattle, Washington, USA
fUniversity of California, San Francisco, General Hospital, San Francisco, California, USA
gTufts Medical Center, Boston, Massachusetts, USA
hUniversity of California, San Francisco, and Veterans Affairs Medical Center, San Francisco, California, USA.
Received 14 October, 2009
Revised 9 November, 2009
Accepted 10 November, 2009
Correspondence to Sadeep Shrestha, Department of Epidemiology, University of Alabama at Birmingham, 1665 University Blvd, RPHB Room 217L, Birmingham, AL 35294-0022, USA. Tel: +1 205 934 6459; fax: +1 205 934 8665; e-mail: email@example.com