云南白族民家支系 18 个常染色体 STR 位点的遗传多态性.

Objective: To investigate the genetic polymorphism of 18 autosomal short tandem repeats (STR) loci in 2 323 healthy unrelated individuals of Minjia branch of Bai nationality in Yunnan, calculate the population genetic parameters, and establish the genetic data of Minjia branch of Bai nationality in Yunnan, so as to provide the scientific basis for the parental identification and individual identification of forensic material evidence. Methods A total of 2 323 unrelated individuals from Minjia branch of Bai nationality population were collected. DNA TyperTM 19 kit was used for direct PCR compound amplification. AB 3130XL automatic genetic analyzer was used to separate the PCR compound amplification products by capillary electrophoresis. STR typing was performed with GeneMapper ID-x 1.5 software. Forensic parameters, such as allele frequency and matching probability, were calculated by Modified Powerstats software, and the hardy-Weinberg equilibrium (HWE) test was performed. The Fst and P values were calculated using Arlequin software. Nei’ s genetic distance was calculated using Phylip software. Multi-dimensional scale (MDS) analysis was performed using SPSS software. The Neighbor-Joining (NJ) phylogenetic tree was constructed by Mega software. Results A total of 230 alleles and 1 073 genotypes were observed at 18 STR loci. Except that D13S317 loci was not in accord with Hardy-Weinberg equilibrium ( P = 0.000 8）, the allele frequencies and genotype frequencies of other loci were consistent with Hardy-Weinberg equilibrium (P > 0.05/20 = 0.002 5）. The cumulative discrimination power (CDP) and cumulative probability of exclusion (CPE) of 18 STR loci were 0.999 999 999 and 0.999 999 940 55, respectively. The results of Fst, Nei’s genetic distance and NJ phylogenetic tree indicated that the Minjia branch of Bai nationality was close to the Bai nationality in Nujiang and the Bai nationality in Dali, but far away from the Bulang nationality in Yunnan and Va nationality in Yunnan. Conclusion The 18 STR loci mentioned above show the high genetic polymorphism in the Minjia branch of Bai nationality and they can be used for the forensic identification and population genetics research [ABSTRACT FROM AUTHOR]