藏族群体Y染色体14个短串联重复序列基因座遗传多态性

目的调查藏族Y染色体上14个短串联重复序列基因座及单倍型的遗传多态性。方法应用AmpFISTRYfilerTM PCR Amplification kit进行复合PCR扩增,自动基因分析仪电泳检测126名藏族男性无关个体血样。结果在14个基因座中共检出121个等位基因,基因多样性分布在0.4104(DYS391)至0.9489(DYS385a,b)之间,除了DYS391以外,其余等位基因频率多样性均大于0.5。由14个基因座组成的Y染色体单倍型系统单倍型有105种,单倍型频率多样性0.9998。结论上述14个Y-短串联重复基因座在藏族群体中具有较好的多态性,单倍型具有很高的遗传多态性。

Genetic polymorphisms of 14 Y-chromosomal short tandem repeat loci haplotypes in Tibetan

OBJECTIVE: To reveal the allelic frequencies and haplotype frequencies of fourteen Y-chromosome short tandem repeat (STR) loci in a Tibetan population. METHODS: The Y-chromosomal STR loci were analyzed from 126 healthy unrelated autochthonous male individuals of Chinese Tibetan using a multiplex PCR system. Allele and haplotype frequencies for these loci were determined by the AmpFISTR Y filer PCR Amplification kit. RESULTS: One hundred and twenty-one alleles were detected from the 14 STR loci. The allele diversity values (DP) for each locus ranged from 0.4104 (DYS391) to 0.9489 (DYS385a, b), the DP value of these loci were higher than 0.5 except for that of DYS391. A total of 105 haplotypes were identified in the Y-STR loci, among which 103 were unique, while two occurred more than once. The overall haplotype diversity for the Y-STR loci was 0.9998, and the discrimination capacity was 0.9898. CONCLUSION: The 14 STR loci above belong to loci of high discriminating ability, the haplotypes are highly polymorphic.