STR遗传多态性研究中样本数量对等位基因检出数量的影响

Effects of sample size on the observed number of allele of 9 STR loci with various genetic data

以30个不同民族9个常染色体STR基因座(D3S1358,vWA,FGA,TH01,TPOX,CSF1PO,D13S317,D5S818,D7S820)的群体遗传研究数据资料为例,探讨群体遗传学研究中常染色体STR基因座等位基因检出数量与样本量之间的关系,即样本量对等位基因检出数量的影响。结果显示,在一定范围之内,样本量的大小与所观测到的不同基因座等位基因检出数量之间存在正相关关系。当超过一定范围时,样本量的继续增加不再明显影响等位基因的检出数量。杂合度较低的位点随样本量的变化波动较大,杂合度较高的位点随样本量的变化波动较小。

In the genetic study, the samples can greatly influence the analysis and interpretation of the genetic data obtained. Here we examined the effects of sample size on the observed number of allele of 9 STR loci （D3S1358, vWA, FGA, TH01, TPOX, CSF1PO, D13S317, D5S818, D7S820） with 30 various population genetic data. The results show： the quantity of alleles and the quantity of samples was not obviously corresponding, while the populations with few samples had more allele observed. And there was no significant influence on the quantity of the allele observed when the quantity of the sampies reached to a certain amount. H （heterozygosity） was up to a stable level when the quantity of sample was 50. Those who had low heterozygosity （such as TPOX） changed obviously with the quantity of samples, while those had high heterozygosity （such as FGA） changed a little with the quantity of samples.