Association between a functional variant of the KLOTHO gene and high-density lipoprotein cholesterol, blood pressure, stroke, and longevity
- PMID: 15677572
- DOI: 10.1161/01.RES.0000157171.04054.30
Association between a functional variant of the KLOTHO gene and high-density lipoprotein cholesterol, blood pressure, stroke, and longevity
Abstract
We previously identified a functional variant of KLOTHO, termed KL-VS, that is associated with human aging and early-onset occult coronary artery disease. Here, we determine whether the KL-VS allele influences cardiovascular disease risk factors, cardiovascular events, and ultimately, mortality. A total of 525 Ashkenazi Jews composed of 216 probands (age > or =95 years) and 309 unrelated individuals (ages 51 to 94) were genotyped for the KL-VS allele. In concordance with our previous data in Czech individuals (age > or =79; P<0.01), a heterozygous advantage for longevity was observed for individuals > or =79 years of age (P<0.004). Combined analysis indicates a 1.57-fold (95% CI, 1.23 to 1.98) increased odds ratio (OR) for 5-year survival in two independent populations (P<0.0002). Cardiovascular disease risk factors were assessed through multivariate regression analysis, demonstrating that high-density lipoprotein cholesterol (HDL-C; P<0.05) and systolic blood pressure (SBP; P<0.008) are associated with KL-VS genotype. History of vascular events was analyzed using logistic regression, indicating that after adjustment for traditional risk factors, heterozygous individuals were at significantly lower risk for stroke than wild-type individuals (OR, 5.88; 95% CI, 1.18 to 29.41), whereas homozygous KL-VS individuals had the highest risk (OR, 30.65; 95% CI, 2.55 to 368.00). Similarly, prospective analysis of mortality in probands using Cox regression indicates that wild-type individuals have a 2.15-fold (95% CI, 1.18 to 3.91) and homozygous KL-VS individuals a 4.49-fold (95% CI, 1.35 to 14.97) increase in relative risk for mortality after adjusting for potential confounders. Thus, cross-sectional and prospective studies confirm a genetic model in which the KL-VS allele confers a heterozygous advantage in conjunction with a marked homozygous disadvantage for HDL-C levels, SBP, stroke, and longevity.
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