海南汉族人群19个STR基因座遗传多态性及其应用

Genetic polymorphisms of 19 STR loci in han population from Hainan and its application in paternity testing

目的建立海南地区汉族人群19个常染色体STR基因座的遗传多态性数据资料,并探讨此19-STR基因座系统在亲子鉴定中的应用。方法对海南汉族462例无血缘关系个体,采用Goldeneye^(TM) 20A系统复合扩增并检测,得到19个STR基因座的遗传数据信息;在283例亲子鉴定案例中,评价19-STR基因座系统的应用。结果 19个STR基因座的基因频率分布均符合Hardy-Weinberg平衡(P>0.05),杂合度在0.603~0.914之间,累积个体识别率大于0.999 999 999 999 999,累积三联体非父排除率为0.999 999 994。283例亲子鉴定中,三联体170例,二联体113例;认定案例247例(87.3%),排除案例36例(12.7%);发生等位基因突变案例14例(4.9%),均为一步突变。结论 19个STR基因座中的14个基因座具有高度遗传多态性,19-STR基因座复合扩增分型系统具有较高的非父排除效能,可满足海南地区亲子鉴定的需要,同时应注意亲子鉴定中的基因突变现象。

Objective To construct a database for the genetic polymorphism of 19 STR loci in Han population from Hainan province. To investigate the application of 19 STR loci in the paternity testing. Methods The genotypes of 462 unrelated individuals in Hainan were detected with Goldeneye^TM 20 A PCR Amplification Kit. 19-STR database was acquired, analyzed and evaluated in 283 paternity testing cases. Results No deviations of allele frequency from HardyWeinberg equilibrium expectations were found for Chi-square test（P〉0.05）. Observed heterozygosity（Hobs） varied between 0.603 and 0.914, total discrimination power（TDP） of 19 STR loci was more than 0.999 999 999 999 999, cumulative probability of exclusion（CPE） for triplet cases was 0.999 999 994. In all 283 paternity testing cases, triplets and duos were 170 and 113 respectively; there were 36（12.7%） excluded cases comparing to 247 confirmed cases（87.3%）. 14 mutation events were observed, and all were one-step mutation. Conclusion 14 out of 19 loci showed highly polymorphic in Han population from Hainan, and 19 STR system has high cumulative probability of exclusion and can meet the needs of paternity test of the local region. But mutation should be paid special attention to.