摘要
首次在国内采用本室改进的高分辨率的基于内含子的PCR -SBT分型方法 ,检测云南纳西族HLA -DRB1基因多态性。在 60例纳西族个体中共检出 37种HLA -DRB1等位基因 ,其显著特点是等位基因的类型检出较多 ,频率分布比较平均 ,除 1 2 0 2 1 ( 1 7 5 0 % )外其他的等位基因频率均低于 8% ,其他较常见的等位基因 ( >5 % )还有 1 40 4 ( 7 5 0 % ) ,1 5 0 4 ( 5 83% ) ,0 4 0 5 1 ( 5 83% ) ,0 80 32 ( 5 83% ) ,0 90 1 2 ( 5 % ) ,0 30 1 1 ( 5 % )。这几种中频等位基因共占可检出等位基因的 35 % ,与 1 2 0 2 1一起共占 5 2 49%。其中DRB1 0 30 5、0 4 38、1 1 2 3、1 1 32、1 31 0、0 81 2为首次在我国人群中检出 ,并且在世界各地人群中也比较罕见。对纳西族和世界各地人群的HLA -DRB1频率进行了聚类分析。比较分析的结果显示纳西族明显属于中国南方族群 ,未显示出其族源来自北方的痕迹。根据遗传数据 ,并参照民族学、历史学研究 。
The HLA DRB1 gene polymorphism of Naxi ethnic group of Yunnan Province, China was investigated for the first time using high resolution PCR SBT method, which is based on sequences of HLA DRB1 Intron 1 and Intron 2 with our improvement. From 60 individuals of Naxi 37 DRB1 alleles were detected. The distribution of allele frequencies is evenly spread for most of alleles detected in Naxi. However, the gene frequency for HLA DRB1 *12021 is 17.50%. The other common alleles (>5%) were HLA DRB1 *1404(7.50%), 1504(5.83%), 04051(5.83%), 08032(5.83%), 09012(5%), 03011(5%), and they covered 35% of the total alleles detected from Naxi, and 52.49% after adding the frequency of HLA DRB1*12021. HLA DRB1*0305, 0438, 1123, 1132, 1310, 0812 were detected in Chinese for the first time, and were very rare in other ethnic groups worldwide. Using the HLA DRB1 gene frequencies of various ethnic groups, we constructed the phylogenetic tree by Fitch Margoliash and Least Squares Distance Methods and Cavalli Sforza's chord measure of genetic distance. In our dendrogram, the South China populations were clustered together, and Siberian, Japanese and Minority of North China were clustered together, in which two big clusters we thought represented the ancient Southern and Northern Mongolian. Our results showed Naxi was clustered with Lahu and Yao ethnic groups, which were in the cluster of South China population. Obviously Naxi belongs to the South China ethnic groups and can't trace its origin from northern ethnic groups with the HLA DRB1 genetic data. But based on Naxi's historical folklore, it was down to Southern China from Northwest China. The preliminary analysis about its origin conundrum was discussed in this paper based on our genetic data in relationship with its history and ethnology studies.
基金
国家杰出青年基金项目 (编号 :3972 5 0 0 7)
国家自然科学基金重点项目 (编号 :69935 0 2 0 )
国家社会科学基金项目 (编号 :OOBZH0 0 1 )~~
