VNTR allelic polymorphism at the phenylalanine hydroxilase (PAH) and endothelial constitutive nitric oxide synthase (eNOS) genes and the prevalence of the CCR5 chemokine receptor gene 32-bp deletion were examined in four populations of Northern Caucasus: Adygs, Kumyks, Karachais, and Nogais (Kuban and Karanogais). Population-specific features of the allele and genotype frequency distribution patterns of the polymorphisms examined were described. The data obtained were compared to those obtained from literature. The results of the study confirmed that the frequency and occurrence of the PAH polymorphic alleles exhibit substantial interpopulation differences. In the populations of Northern Caucasus, the eNOS minisatellite polymorphism alleles and genotypes frequency distribution patterns were close to those described earlier for populations of the Volga–Ural region (VUR), and also for the Australian Caucasoids, Japanese, and Turks. In the populations examined, the mean frequency of the CCR5 gene deletion was 0.055, which was somewhat lower than in the populations of VUR (0.070) and Europe (0.081), and practically identical to that in Asian populations (0.050). For each population observed and expected heterozygosities at each locus were calculated. In general, the gene pool of Northern Caucasian populations showed substantial differentiation at the loci examined: the G ST value was 0.0274. The data for individual loci showed that the greater contribution to the interpopulation diversity was made by the differences in the PAH VNTR allele frequencies (G ST = 0.04), while the differences at the eNOSand CCR5 loci were small (G ST = 0.0025 and G ST = 0.0039, respectively).
Russian Journal of Genetics – Springer Journals
Published: Oct 18, 2004
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