Abstract
To investigate the genetic variation and forensic efficiency of 16 X-chromosomal short tandem repeat (X-STR) loci (DX6795, DXS9902, DXS8378, HPRTB, GATA165B12, DXS7132, DXS7424, DXS6807, DXS6803, GATA172D05, DXS6800, DXS10134, GATA31E08, DXS10159, DXS6789, and DXS6810) in the Bai minority, we calculated allele frequencies, forensic parameters, and haplotype frequencies in 424 (202 males and 222 females) unrelated, healthy Bai individuals from Dali Bai Autonomous Prefecture in Yunnan Province, China. We observed a total of 132 alleles; 5-19 alleles were detected in each locus, and the corresponding allele frequencies ranged from 0.0016 to 0.7589. All of the loci detected were highly polymorphic in the Bai population in Yunnan Province, except DXS6800. The values for the combined power of discrimination in females (PDf) and males (PDm) were 0.999999999999996 and 0.999999997487061, respectively. According to a phylogenetic tree, neighboring populations and different nationalities in the same area appeared to have relatively close evolutionary relationships. This study provides and complements X-chromosome genetic polymorphism data for the Bai people in Yunnan Province, Southwest China, and enriches the available reference materials for this Chinese minority population.
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