Allelic polymorphic investigation of 21 autosomal short tandem repeat loci in a Chinese Bai ethnic group

Population genetic data of 21 autosomal short tandem repeats (STRs) were obtained in a sample of 106 unrelated healthy individuals of Bai ethnic minority born in the Dali Bai Autonomous Prefecture in Yunnan Province. We observed 138 alleles with corresponding allelic frequencies ranging from 0.005 to 0.575. The genotypic frequency distributions at those STR loci were consistent with Hardy–Weinberg equilibrium (Bonferroni’s correction was used for Hardy–Weinberg equilibrium tests). The combined probability of exclusion, power of discrimination, probability of matching value for all 21 STR loci were 0.9999975729, 0.999999999999999999872 and 1.28 × 10−19, respectively. The population data in this study showed significant differences from the previously published population data of Tibetan and Salar groups in some loci.