A genome-wide search for susceptibility loci to human essential hypertension - PubMed (original) (raw)
A genome-wide search for susceptibility loci to human essential hypertension
P Sharma et al. Hypertension. 2000 Jun.
Abstract
We undertook a systematic search of the entire human genome with the affected sibling-pair model to identify major susceptibility loci to essential hypertension. Affected nuclear families (n=263) were recruited and divided according to definite or probable genetic contribution to hypertension depending on number of hypertensive siblings. The largest nuclear families were first screened with a set of microsatellite markers. Regions on the genome with P<0.05 were tested against the second set of smaller families. An exclusion map was generated to identify regions in which hypertension-causing genes are unlikely to reside. Sibling-pair linkage analysis identified a single locus on chromosome 11q (P<0.004) in the first pass. A second pass with nuclear families that had only affected sibling pairs was, as expected, insufficient to support linkage to 11q. Multipoint exclusion-linkage analysis showed that 3 genetic loci are necessary to explain familial aggregation of essential hypertension. Our preliminary findings suggest that no single region within the human genome contains genes with a major contribution to essential hypertension. We show that the disease is indeed polygenic, with each gene providing a relatively small risk. Our exclusion map will help future investigators to concentrate on areas likely to contain these genes. The region on chromosome 11 is the first to point to a new candidate gene for hypertension that has arisen out of a genome search, but replication of these results at a higher significance is necessary before positional cloning can be justified.
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