广东汉族人群MICA和MICB微卫星多态性分布

The polymorphism distributions of MICA and MICB microsatellite in Guangdong Han population

目的 调查广东地区汉族人群 MICA基因第 5外显子和 MICB基因第 1内含子微卫星多态性分布。方法 应用聚合酶链反应和荧光 ( 6 - FAM)自动化检测技术 ,对广东地区共 10 6名无亲缘关系样本进行 MICA和 MICB微卫星基因分型 ,并计算这两个微卫星的基因频率、基因型频率、个体鉴别力、期望杂合性、多态性信息含量和非父排除率。结果 MICA和 MICB微卫星基因型分布符合 Hardy- Weinberg平衡。MICA A5基因频率最高为 0 .2 877,A4基因频率则最低为 0 .132 1;A5 - 5 .1( 14 .15 % )和 A5 - 5 ( 10 .38% )基因型分布频率较高。 MICB CA14等位基因频率最高为 0 .32 5 5 ,CA19、CA2 8等位基因频率最低为0 .0 0 4 7,未检出 CA2 7。 CA14 - CA14 ( 14 .15 % )基因型分布频率较高。结论 MICA基因第 5外显子和MICB基因第 1内含子微卫星适合作为中国人群的遗传标志 ,用于人类学、遗传疾病基因连锁分析。

Objective To investigate the genetic polymorphism of microsatellite in the exon 5 of MICA gene and the intron 1 of MICB gene in Guangdong Han population. Methods One hundred and six samples of Guangdong Han population were genotyped by polymerase chain reaction and fluorescent technique (6-FAM). Gene frequency, power of discrimination, expected heterozygosity, polymorphism information content and probability of paternity exclusion were calculated. Results The genotype distributions of MICA and MICB microsatellite met Hardy-Weinberg equilibrium. MICA A5 was the most common allele (0.2877), whereas A4 was the least popular one (0.1321). The genotype distribution frequencies of A5-5.1 (14.15%) and A5-5 (10.38%) are high. MICB CA14 was the most common allele (0.3255), and CA19,28 was the least popular one (0.0047). CA27 was not observed. The genotype distribution frequency of CA14-CA14(14.15%) is high. Conclusion The microsatellite of the exon 5 of MICA gene and the intron 1 of MICB gene could be used as the genetic markers of Chinese population in the studies of anthropology, linkage analysis of genetic disease genes, individual identification and paternity test in forensic medicine.