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Mutation analysis of 28 autosomal short tandem repeats in the Chinese Han population

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Abstract

Short tandem repeats (STRs) have been extensively used in forensic genetics. However, according to previous studies, the mutation rates of STRs are relatively high and are affected by many factors. Therefore, it is important to analyze STR mutations and determine the influence of underlying factors on STR mutation rates. Mutation rates of 28 autosomal STRs were determined from 8708 paternity testing cases in the Chinese Han population, and the relationships between STR mutation rates and population, sex, age, allele length and heterozygosity were investigated. A total of 279 mutations were observed at 27 loci in a total of 233,530 meiosis cases, including 273 (97.8%) one-step, 5 (1.8%) two-step and 1 (0.4%) three-step mutations. The overall average mutation rate was 1.19 × 10–3 (95% CI 1.06 × 10–3 − 1.34 × 10–3) ranging from 0 (TPOX) to 2.79 × 10–3 (D13S325). Mutation rate comparisons revealed statistically significant differences at several STRs among populations. Paternal mutations occurred more frequently than maternal mutations, at a ratio of 6.04:1, and the mutation rate tended to increase with paternal age. Moreover, our study revealed a bias towards contraction mutations for long alleles and expansion mutations for short alleles. No obvious bias was observed in the overall mutation direction. In addition, STR loci with higher expected heterozygosity (Hexp) tended to have higher mutation rates. This work revealed the relationships between STR mutation rates and several influencing factors, providing useful data and information for further research on STR mutations in forensic genetics.

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Funding

This work was supported by the Fundamental Research Funds for the Central Universities (HUST: No. 2016YXZD025).

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  1. Yujie Huang and Cong Liu have contributed equally to this work.

Authors and Affiliations

  1. Department of Forensic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

    Yujie Huang, Cong Liu, Chao Xiao, Xiaoying Chen, Xueli Han, Shaohua Yi & Daixin Huang

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  1. Yujie Huang
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  2. Cong Liu
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  3. Chao Xiao
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  4. Xiaoying Chen
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  5. Xueli Han
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  7. Daixin Huang
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Correspondence to Daixin Huang.

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This study was approved by the Medical Ethics Committee of Tongji Medical College, Huazhong University of Science and Technology.

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Huang, Y., Liu, C., Xiao, C. et al. Mutation analysis of 28 autosomal short tandem repeats in the Chinese Han population. Mol Biol Rep 48, 5363–5369 (2021). https://doi.org/10.1007/s11033-021-06522-7

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