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Song F, Wei X, Zhou C, Wang S, Deng C, Liao M, Luo H. Resolving the recombination pattern of 38 X-STRs from Chinese Han three-generation pedigrees. Leg Med (Tokyo) 2022; 59:102135. [PMID: 36029693 DOI: 10.1016/j.legalmed.2022.102135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/26/2022] [Accepted: 08/17/2022] [Indexed: 11/18/2022]
Abstract
X-chromosomal markers have been proved as a useful tool for solving complex kinship cases due to its sex-linked inheriting feature. Among these markers, tightly linked X-STR clusters forming haplotypes are highly informative. The analysis of the haplotypes requires determination of linkage disequilibrium. In this study, genetic linkage, recombination fractions and mutation rates of 38 X-STR loci in 177 three-generation pedigrees were investigated. Genetic linkage analysis and calculation of recombination fractions were performed within each pair of markers and clusters. Then mutation rates were calculated. The results showed that, a) 22 recombination events happened within the tightly linked X-STR clusters, which span<1.0 Mb; b) significantly linked marker pairs were observed with the LOD (logarithm of the odds) scores > 2.0 (2.0104 to 54.8316); c) the average mutation rate of the 38 X-STR loci was 1.32 × 10-3 per meiosis in the Chinese Han population, with DXS10135 and DXS8377 presenting notably high mutation rate (6.5 × 10-3). Our results confirmed that meiotic recombination was not a simple function of physical distance, so that whether recombination occurred at the closely clustered X-STRs or not should be assumed cautiously considering the stability of haplotypes in inheritance process for kinship analysis. This study supplemented the existing database and laid an experimental foundation for the future study on genetic characteristics, recombination, and mutation of the X-STRs.
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Affiliation(s)
- Feng Song
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Xiaowen Wei
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Chengye Zhou
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Shuangshuang Wang
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Chuncao Deng
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Miao Liao
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China
| | - Haibo Luo
- Department of Forensic Genetics, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China.
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Perera N, Wijithalal R, Galhena G, Ranawaka G. Linkage, recombination and mutation rate analyses of 16 X-chromosomal STR loci in Sri Lankan Sinhalese pedigrees. Int J Legal Med 2022; 136:415-422. [PMID: 35022841 DOI: 10.1007/s00414-021-02762-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/01/2021] [Indexed: 11/25/2022]
Abstract
This study investigated genetic linkage, recombination fractions and mutation rates of 16 X chromosomal short tandem repeat (X-STR) markers using a recently developed multiplex PCR assay for Sinhalese population of Sri Lanka, by analyzing 81 three-generation families including 81 grandfathers with daughters and 162 grandsons. In addition, 31 two generation families involving mother father daughter trios were included for mutation analysis. The analysis of recombination fractions between marker pairs identified two linkage blocks (maximum LOD scores > 3.0) each spanning a physical distance of 44.35 Mb and 6.04 Mb respectively. Though recombination events are usually rare among closely linked markers, crossovers were observed for markers located < 1.0 Mb apart. The recombination fractions observed are not fully concordant with those reported earlier, including the second-generation Rutgers combined linkage-physical map. This suggests that linkage is not uniform among different populations. However, the overall and marker-specific mutation rates of the present study did not differ from previous reports, though it needs confirmation with a much larger sample set. The findings presented here will provide the baseline information required for biostatistical calculations conducted using X-STR markers, in complex kinship analysis of Sinhalese population.
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Affiliation(s)
- Nandika Perera
- Genetech Molecular Diagnostics, Colombo 08, Sri Lanka. .,Faculty of Health Sciences, The Open University of Sri Lanka, Nawala, Sri Lanka.
| | - Ruvini Wijithalal
- Department of Zoology and Environment Sciences, University of Colombo, Colombo 03, Sri Lanka
| | - Gayani Galhena
- Department of Zoology and Environment Sciences, University of Colombo, Colombo 03, Sri Lanka
| | - Gaya Ranawaka
- Faculty of Natural Sciences, The Open University of Sri Lanka, Nawala, Sri Lanka
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Yang Q, Qian J, Shao C, Yao Y, Zhou Z, Xu H, Tang Q, Qian X, Xie J. Identification and Characterization of Nine Novel X-Chromosomal Short Tandem Repeats on Xp21.1, Xq21.31, and Xq23 Regions. Front Genet 2021; 12:784605. [PMID: 34868274 PMCID: PMC8635773 DOI: 10.3389/fgene.2021.784605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 10/20/2021] [Indexed: 11/13/2022] Open
Abstract
The application of X-chromosomal short tandem repeats (X-STRs) has been recognized as a powerful tool in complex kinship testing. To support further development of X-STR analysis in forensic use, we identified nine novel X-STRs, which could be clustered into three linkage groups on Xp21.1, Xq21.31, and Xq23. A multiplex PCR system was built based on the electrophoresis. A total of 198 unrelated Shanghai Han samples along with 168 samples from 43 families was collected to investigate the genetic polymorphism and forensic parameters of the nine loci. Allele numbers ranged from 5 to 12, and amplicon sizes ranged from 146 to 477 bp. The multiplex showed high values for the combined power of discrimination (0.99997977 in males and 0.99999999 in females) and combined mean exclusion chances (0.99997918 and 0.99997821 in trios, 0.99984939 in duos, and 0.99984200 in deficiency cases). The linkage between all pairs of loci was estimated via Kosambi mapping function and linkage disequilibrium test, and further investigated through the family study. The data from 43 families strongly demonstrated an independent transmission between LGs and a tight linkage among loci within the same LG. All these results support that the newly described X-STRs and the multiplex system are highly promising for further forensic use.
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Affiliation(s)
- Qinrui Yang
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Jinglei Qian
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Chengchen Shao
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Yining Yao
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Zhihan Zhou
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Hongmei Xu
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Qiqun Tang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Xiaoqin Qian
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Jianhui Xie
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, China
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Xiao C, Yang X, Liu H, Liu C, Yu Z, Chen L, Liu C. Validation and forensic application of a new 19 X-STR loci multiplex system. Leg Med (Tokyo) 2021; 53:101957. [PMID: 34481193 DOI: 10.1016/j.legalmed.2021.101957] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 07/23/2021] [Accepted: 08/16/2021] [Indexed: 11/30/2022]
Abstract
The Microreader™ 19X Direct ID System was a newly developed multiplex PCR kit, which could detect 19 X-chromosomal STR loci (DXS6795, DXS9907, DXS6803, GATA172D05, DXS6807, GATA31E08, DXS7423, DXS6810, DXS101, DXS9902, DXS7133, DXS6800, DXS981, DXS10162, DXS6809, DXS10135, HPRTB, GATA165B12, DXS10079) and the sex determination locus of AMEL simultaneously. Different from other X-STR multiplex PCR kits, no linkage groups are included in this system, so the likelihood ratios could be calculated without the consideration of linkage groups. In this study, PCR conditions, sensitivity, species specificity, stability, DNA mixtures, concordance, stutter, sizing precision and population studies were conducted according to the SWGDAM developmental validation guidelines. The results indicated that this new X-STRs multiplex system was an efficient and reliable detection system, which could facilitate human kinship analysis and identification testing, as a powerful supplementary to autosomal STR kits.
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Affiliation(s)
- Cheng Xiao
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China; School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Xingyi Yang
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China
| | - Hong Liu
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China
| | - Changhui Liu
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China
| | - Zhonghao Yu
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China; School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China
| | - Ling Chen
- School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China.
| | - Chao Liu
- Guangzhou Forensic Science Institute, Guangdong Province Key Laboratory of Forensic Genetics, Guangzhou 510030, China; School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China.
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