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Chromosome 6p microsatellite polymorphisms in African-Americans.

Allele frequency distributions were determined for seven microsatellite DNA markers spanning the short arm of chromosome 6 in a population of African-Americans. A total of 196 chromosomes were analyzed. African-Americans differed from reported studies on Caucasians in the number of alleles, allele frequency and predominating alleles. These differences resulted in higher heterozygosity and polymorphic information content for these loci in the African-American population than in Caucasians. Each marker appeared to be in Hardy-Weinberg equilibrium within this population. These results demonstrate the need to determine population-specific allele frequency distributions for polymorphic markers when performing genetic linkage studies in racially defined groups. This study provides gene frequency data for this ethnic group in a region of the genome which has attracted attention as contributing genetic susceptibility to a number of diseases.