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Chen M, Ren H, Liu Z, Zhao J, Chen C, Shi Y, Jia L, Cheng F, Chen T, Fan Q, Yang Y, Liu Y, Zhang G, Yan J. Genetic polymorphisms and mutation rates of 16 X-STRs in a Han Chinese population of Beijing and application examples in second-degree kinship cases. Int J Legal Med 2019; 134:163-168. [PMID: 30937593 DOI: 10.1007/s00414-019-02047-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 03/19/2019] [Indexed: 10/27/2022]
Abstract
As a supplementary tool in forensic cases, X chromosomal short tandem repeats (X-STRs) might bridge large pedigree gaps and bring inspiration to forensic practices for the special mode of inheritance. To standardize the application of X-STRs, the DNA Commission of the International Society for Forensic Genetics (ISFG) presented recommendations concentrating on biostatistical evaluations. Following this guideline, in this study, 1247 (655 females and 592 males) unrelated individuals and 770 families originating from a Han Chinese population of Beijing were investigated with 16 X-STRs. The combined PDF and PDM were 0.999999999999994 and 0.999999997, respectively. The combined MECKrüger, MECKishida, MECDesmarais, and MECDesmarais duo were 0.999972736708864, 0.999999975670766, 0.999999975720931, and 0.999993489709197, respectively. In addition, a population comparison demonstrated that genetic heterogeneity widely exists between the Han population of Beijing and other populations, especially southern Han Chinese, European, and West African populations. Additionally, the overall mutation rates of the paternal and maternal germlines of the 16 X-STRs were 0.0021 and 0.0003, respectively. Among them, HPRTB showed the highest paternal mutation rate of 0.0094. Finally, based on these forensic parameters, the likelihood ratios of four second-degree kinship cases were evaluated. Comparing with autosomal STR, X-STR showed significant advantages for hypothesis exclusion. Our study indicated that the 16 X-STR loci are highly polymorphic in the Han population of Beijing and could be a satisfactory complimentary tool for forensic applications.
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Affiliation(s)
- Man Chen
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China.,University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - He Ren
- Beijing Police College, Beijing, 102202, People's Republic of China
| | - Zhiyong Liu
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China.,University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Jing Zhao
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Chong Chen
- Beijing Tongda Shoucheng Institute of Forensic Science, Beijing, 100192, People's Republic of China
| | - Yan Shi
- Beijing Tongda Shoucheng Institute of Forensic Science, Beijing, 100192, People's Republic of China
| | - Li Jia
- Beijing Tongda Shoucheng Institute of Forensic Science, Beijing, 100192, People's Republic of China
| | - Feng Cheng
- School of Forensic Medicine, Shanxi Medical University, Taiyuan, 030009, People's Republic of China
| | - Tong Chen
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China.,University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Qingwei Fan
- School of Forensic Medicine, Shanxi Medical University, Taiyuan, 030009, People's Republic of China
| | - Yaran Yang
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China
| | - Yacheng Liu
- Beijing Tongda Shoucheng Institute of Forensic Science, Beijing, 100192, People's Republic of China
| | - Gengqian Zhang
- School of Forensic Medicine, Shanxi Medical University, Taiyuan, 030009, People's Republic of China.
| | - Jiangwei Yan
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China. .,University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China. .,School of Forensic Medicine, Shanxi Medical University, Taiyuan, 030009, People's Republic of China.
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