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Hereditas(Beijing) ›› 2020, Vol. 42 ›› Issue (6): 565-576.doi: 10.16288/j.yczz.19-330

• Research Article • Previous Articles     Next Articles

A genetic sub-structure study of the Tibetan population in Southwest China

Xiaojuan Wang1,2, Enfang Qian1, Yue Li2, Zhengyang Song1,2, Hui Zhao2, Hexin Xie2, Caixia Li1,2, Jiang Huang1, Li Jiang2   

  1. 1. Institute of Forensic Medicine, Guizhou Medical University, Guiyang 550004, China
    2. Institute of Forensic Science, Ministry of Public Security & Beijing Engineering Research Center of Crime Scene Evidence Examination & National Engineering Laboratory for Forensic Science, Beijing 100038, China;
  • Received:2019-12-26 Revised:2020-04-14 Online:2020-06-20 Published:2020-04-17
  • Supported by:
    Supported by the National Natural Science Foundation of China No(81772027);the National Key R&D Program of China No(2017YFC0803501);the Fundamental Research Funds for Institute of Forensic Science No(2017JB025);the National Science and Technological Resources Platform No(YCZYPT[2017]01-3)

Abstract:

Tibetan is a typical ethnic minority population in Southwest China, which can be divided into U-Tsang, Kham, Amdo, Jiarong and other sub-populations. However, the genetic structure of these sub-populations has not been comprehensively analyzed, especially from the perspective of paternal and maternal lineages. Based on genetic markers of autosomes, the Y chromosome and mitochondria, we studied four Tibetan populations (the U-Tsang population in Tibet Autonomous Region; the Kham population in Garze, Sichuan province; the Amdo population in Qinghai province and the Jiarong population in Aba, Sichuan province) to interpret their genetic structure. The mini-sequencing technology was used to detect the genotype of each maker. Meanwhile, the PowerPlex ?Y23 and DNA Typer TM Y26 kit were applied to genotype Y-STRs. Subsequently, the genetic structure was analyzed by heatmap and principal component analysis, ancestry component, haplogroup frequency, network map and multi-dimensional scaling analysis. The results showed that the four Tibetan populations could be divided into three sets based on the autosomal and Y-chromosomal genetic markers, in which set 1 was the U-Tsang population in the Tibetan Plateau, set 2 comprised of the Kham and Amdo populations in the surrounding areas of the plateau, and set 3 was the Jiarong population that resided in the Tibetan and Yi Corridor. No significant difference was observed in mitochondrial genetic markers among four Tibetan populations. In general, multi-category genetic information provides a new comprehensive insight into the Tibetan sub-population.

Key words: population genetics, Tibetan, haplotype, genetic sub-structure