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X-chromosomal STR-based genetic structure of Sichuan Tibetan minority ethnicity group and its relationships to various groups

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Abstract

The X-chromosomal short tandem repeats (STRs) with more informative than autosomal STRs in some complicated biological relationships identification due to its specific mode of genetic transmission can be used as a complementary tool in forensic case practices. In this study, we presented the population genetic data of 19 X-STRs, consisting of DXS10174, DXS10075, DXS10079, DXS101, DXS10101, DXS10103, DXS10134, DXS10135, DXS10148, DXS10159, DXS10162, DXS10164, DXS6789, DXS6809, DXS7132, DXS7423, DXS7424, DXS8378, and HPRTB loci, in a sample of 235 individuals of Tibetan nationality from Sichuan province, Southwest China. All 19 X-STR loci were consistent with Hardy-Weinberg equilibrium. The results showed that the combined power of discrimination in females and males are 0.999999999999999999997 and 0.9999999999997, respectively. In addition, the mean paternity exclusion chances based on the formula of MECKrüger, MECKishida, and MECDesmarais as well as MECDesmarais Duo are 0.99999991, 0.9999999999924, 0.9999999999929, and 0.999999985, respectively. In summary, our findings suggested that the AGCU X19 kit can be considered to serve as a high polymorphic information tool for forensic identification and kinship testing in the Sichuan Tibetan population. Furthermore, population genetic structure investigation between Sichuan Tibetan population and other 19 populations using PCA, MDS, and phylogenetic tree illustrated that significant genetic difference was observed between the Sichuan Tibetan and Malay, as well as the Xinjiang Uyghur population.

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Acknowledgements

The study was supported by the Sichuan Science and Technology Support Program (2014SZ0012).

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Author notes

  1. Guanglin He and Ye Li contributed equally to these studies.

Authors and Affiliations

  1. Department of Forensic Genetics, West China School of Basic Sciences and Forensic Medicine, Sichuan University (West China University of Medical Sciences), Chengdu, 610041, Sichuan, People’s Republic of China

    Guanglin He, Ye Li, Hepei Li, Mengge Wang & Jin Wu

  2. Department of Forensic Medicine, College of Basic Medicine, Chongqing Medical University, Chongqing, 400042, China

    Xing Zou

  3. Department of Obstetrics and Gynecology, Dujiangyan Medical Central, Dujiangyan, Sichuan, 611830, China

    Ying Zhang

Authors
  1. Guanglin He
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  2. Ye Li
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  4. Ying Zhang
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  5. Hepei Li
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  6. Mengge Wang
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  7. Jin Wu
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Contributions

G.H. and Y.L. wrote the manuscript, X.Z. and Y.Z. collected the samples, G.H., Y.L., X.Z., M. W. and H.L. conducted the experiment and analyzed the results, X.Z. modified the manuscript. J.W. conceived the experiment.

Corresponding author

Correspondence to Jin Wu.

Ethics declarations

Our experiments were approved by the Ethics Committee of Sichuan University, China.

Conflict of interest

The authors declare that they have no conflict of interests.

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He, G., Li, Y., Zou, X. et al. X-chromosomal STR-based genetic structure of Sichuan Tibetan minority ethnicity group and its relationships to various groups. Int J Legal Med 132, 409–413 (2018). https://doi.org/10.1007/s00414-017-1672-9

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  • DOI: https://doi.org/10.1007/s00414-017-1672-9

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