Key result
A higher gene risk score (≥9) was significantly associated with increased carotid intima-media thickness compared to a score ≤5 (P<0.001), with distinct genes affecting different carotid segments.
Why the study?
Do specific single nucleotide polymorphisms associate with common carotid artery and bifurcation intima-media thickness in a Hispanic cohort?
Observational (n=408)
Do specific single nucleotide polymorphisms associate with common carotid artery and bifurcation intima-media thickness in a Hispanic cohort?
p-value: p=<0.001
Multiple genes contribute to the variation in carotid IMT, and different carotid segments may be regulated by distinct sets of susceptibility genes.
BACKGROUND AND PURPOSE: Carotid intima-media thickness (IMT) is a surrogate marker of subclinical atherosclerosis and a strong predictor of stroke and myocardial infarction. The object of this study was to determine the association between carotid IMT and 702 single nucleotide polymorphisms in 145 genes. METHODS: B-mode carotid ultrasound was performed among 408 Hispanics from the Northern Manhattan Study. The common carotid artery IMT and bifurcation IMT were phenotypes of interest. Genetic effects were evaluated by the multivariate regression model adjusting for traditional vascular risk factors. For each individual, we calculated a gene risk score (GRS) defined as the total number of the significant single nucleotide polymorphisms in different genes. Subjects were then divided into 3 GRS categories using the 2 cutoff points: mean GRS +/-1 SD. RESULTS: We identified 6 significant single nucleotide polymorphisms in 6 genes for common carotid artery IMT and 7 single nucleotide polymorphisms in 7 genes for bifurcation IMT using the probability value of 0.005 as the significant level. There were no common significant genes for both phenotypes. The most significant genes were the tissue plasminogen activator (P=0.0005 for common carotid artery IMT) and matrix metallopeptidase-12 genes (P=0.0004 for bifurcation IMT). Haplotype analysis did not yield a more significant result. Subjects with GRS >or=9 had significantly increased IMT than those with GRS <or=5 (P<0.001). GRS was an independent predictor of both common carotid artery IMT (P=2.3x10(-9)) and bifurcation MT (P=7.2x10(-8)). CONCLUSIONS: Multiple genes contributed to the variation in carotid IMT. IMT in different carotid segments may be regulated by different sets of susceptibility genes.
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Liao et al. (2008) conducted an observational in Subclinical atherosclerosis (n=408). Gene risk score (GRS) and single nucleotide polymorphisms vs. Lower gene risk score (GRS ≤5) was evaluated on Common carotid artery IMT and bifurcation IMT (p=<0.001). A higher gene risk score (≥9) was significantly associated with increased carotid intima-media thickness compared to a score ≤5 (P<0.001), with distinct genes affecting different carotid segments.
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