© 1995 American Heart Association, Inc.
Articles |
A Major Locus Influencing Plasma High-Density Lipoprotein Cholesterol Levels in the San Antonio Family Heart Study
Segregation and Linkage Analyses
From the Department of Genetics, Southwest Foundation for Biomedical Research, and the Division of Epidemiology (M.P.S.), University of Texas Health Science Center at San Antonio, San Antonio, Tex.
Correspondence to Michael C. Mahaney, PhD, Department of Genetics, Southwest Foundation for Biomedical Research, PO Box 28147, San Antonio, TX 78228-0147. E-mail mmahaney@darwin.sfbr.org.
Abstract To detect and measure the effects of a single locus on quantitative variation in plasma concentrations of HDL cholesterol (HDL-C), we conducted statistical genetic analyses on data from 526 Mexican American individuals in 25 randomly ascertained pedigrees. By using maximum-likelihood complex segregation analysis, we found evidence for a major locus with a codominant mixture model that included the phenotypic means, standard deviations, relative frequency of a low HDL-C allele, and heritability for plasma HDL-C levels, plus the effects of sex (genotype specific), age-by-sex, age2-by-sex, plasma concentrations of apolipoprotein (apo)AI and triglycerides (genotype specific), exogenous sex hormone use, and menopausal status under an unrestricted general model. Inclusion of the four covariates (in addition to the sex and age-by-sex effects) accounted for nearly 79% of the variance in total plasma HDL-C levels. Of the remaining 21% of the variance, the detected major locus accounted for approximately 55% in men and 21% in women; the total genetic contributions to the variance by genes were approximately 82% in men and 69% in women. Linkage analyses with penetrance parameter estimates from the segregation analysis excluded tight linkage between the detected major locus and markers for the following candidate loci: the apoAI/apoCIII genomic region (P<.05), apoB (P<.01), hepatic lipase (P<.001), lipoprotein lipase (P<.001), and the LDL receptor (P<.001). While not excluding the apoE locus (LOD=-0.348, P<.21), the analysis provided no support for tight linkage between it and the detected major locus.
Key Words: HDL cholesterol • inheritance • linkage • candidate genes • genetic epidemiology
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