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Zhang R, Tan Y, Wang L, Jian H, Zhu J, Xiao Y, Tan M, Xue J, Yang F, Liang W. Set of 15 SNP-SNP Markers for Detection of Unbalanced Degraded DNA Mixtures and Noninvasive Prenatal Paternity Testing. Front Genet 2022; 12:800598. [PMID: 35222521 PMCID: PMC8866868 DOI: 10.3389/fgene.2021.800598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 12/17/2021] [Indexed: 11/21/2022] Open
Abstract
Unbalanced and degraded mixtures (UDM) are very common in forensic DNA analysis. For example, DNA signals from criminal suspects are masked by a large amount of DNA from victims, or cell-free fetal DNA (cffDNA) in maternal plasma is masked by a high background of maternal DNA. Currently, detecting minor DNA in these mixtures is complex and challenging. We developed a new set of SNP-SNP microhaplotypes with short amplicons, and we successfully genotyped them using the new method of amplification-refractory mutation system PCR (ARMS-PCR) combined with SNaPshot technology based on a capillary electrophoresis (CE) platform. This panel reflects a high polymorphism in the Southwest Chinese Han population and thus has excellent potential for mixture studies. We evaluated the feasibility of this panel for UDM detection and noninvasive prenatal paternity testing (NIPPT). Fifteen SNP-SNPs detected minor DNA of homemade DNA mixtures, with a sensitivity of 0.025–0.05 ng and a specificity of 1:1,000. In addition, the panel successfully genotyped degraded DNA from single and mixed samples. Finally, 15 SNP-SNPs were applied to 26 trios. All samples displayed positive results with at least one marker to detect cffDNA. Besides, all fetal alleles in maternal plasma were confirmed by genotyping fetal genomic DNA from amniocentesis and paternal genomic DNA from peripheral blood. The results indicated that the SNP-SNP strategy based on the CE platform was useful for UDM detection and NIPPT.
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Affiliation(s)
- Rangran Zhang
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Yu Tan
- Department of Obstetrics and Gynecology, West China Second University Hospital, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, Sichuan University, Chengdu, China
| | - Li Wang
- Department of Obstetrics and Gynecology, West China Second University Hospital, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, Sichuan University, Chengdu, China
| | - Hui Jian
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Jing Zhu
- Department of Forensic Science and Technology, Sichuan Police College, Luzhou, China
| | - Yuanyuan Xiao
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Mengyu Tan
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Jiaming Xue
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
| | - Fan Yang
- Department of Obstetrics and Gynecology, West China Second University Hospital, Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, Sichuan University, Chengdu, China
- Department of Ultrasonography, West China Second University Hospital Sichuan University, Chengdu, China
| | - Weibo Liang
- Department of Forensic Genetics, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, China
- *Correspondence: Weibo Liang,
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Liu J, Hao T, Cheng X, Wang J, Li W, Liu Z, Shi J, Li Z, Ren J, Yun K, Zhang G. DIP-microhaplotypes: new markers for detection of unbalanced DNA mixtures. Int J Legal Med 2020; 135:13-21. [PMID: 32372232 DOI: 10.1007/s00414-020-02288-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 03/30/2020] [Indexed: 12/14/2022]
Abstract
The identification of a suspect in a degraded and unbalanced DNA mixture has been a challenge for the standard short tandem repeat polymorphisms (STR) typing. Several methods have been introduced to solve this problem, such as DIP-STR, DIP-SNP, and SNP-STR markers. In this study, we proposed DIP-microhaplotype (deletion/insertion linked a chain of SNPs) as a kind of new genetic marker to type the unbalanced and degraded DNA mixture. We established the detection method with ten DIP-microhaplotype markers including 26 SNPs using allele-specific multiplex PCR followed by SNaPshot assay. This novel compound marker allows us to detect the minor DNA with a sensitivity of 1:100 to 1:1000 in a DNA mixture of any gender. Most of the DIP-microhaplotype markers had a relatively high probability of informative alleles with an average informative value (I value) of 0.308. In all, we proposed DIP-microhaplotype as a novel type of DNA marker for the detection of minor contributor from unbalanced DNA mixtures. Due to their inherent shorter length, higher polymorphism, and sensitivity, DIP-microhaplotypes are promising markers for the examination of the degraded and unbalanced mixtures in forensic stains or clinical chimeras.
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Affiliation(s)
- Jinding Liu
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Ting Hao
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Xiaojuan Cheng
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Jiaqi Wang
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Wenyan Li
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Zidong Liu
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Jie Shi
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Zeqin Li
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Jianbo Ren
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China
| | - Keming Yun
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China.
| | - Gengqian Zhang
- Department of Forensic Biology, School of Forensic Medicine, Shanxi Medical University, Wenhua Street 55#, Jinzhong, 030619, Shanxi, People's Republic of China.
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Liu J, Li W, Wang J, Chen D, Liu Z, Shi J, Cheng F, Li Z, Ren J, Zhang G, Yun K. A new set of DIP-SNP markers for detection of unbalanced and degraded DNA mixtures. Electrophoresis 2019; 40:1795-1804. [PMID: 31120138 DOI: 10.1002/elps.201900017] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 04/15/2019] [Accepted: 05/18/2019] [Indexed: 11/11/2022]
Abstract
Unbalanced and degraded mixtures (UDM) are frequently encountered during forensic DNA analysis. For example, forensic DNA units regularly encounter DNA mixture signal where the DNA signal from the alleged offender is masked or swamped by high quantities of DNA from the victim. Our previous data presented a new kind of DNA markers that composed of a deletion/insertion polymorphism (DIP) and a SNP and we termed this new kind of microhaplotypes DIP-SNP (combination of DIP and SNP). Since such markers could be designed short enough for degraded DNA amplification, we hypothesized that DIP-SNP markers are applicable for typing of UDM. In this study, we developed a new set of DIP-SNPs with short amplicons which were complement to our prior developed system. The multiplex PCR and SNaPshot assay were established for 20 DIP-SNPs in a Chinese Han population. The DIP-SNPs were capable of detecting the minor contributor's allele in home-made DNA mixture with sensitivities from 1:100 to 1:1000 with a total of 1 -10 ng input DNA. Moreover, this system successfully typed the degraded DNA whether it came from the single source or mixture samples. In Chinese population, the system showed an average informative value of 0.293 and combined informative value of 0.998363862. Our results demonstrated that DIP-SNPs may serve as a valuable tool in detection of UDM in forensic medicine.
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Affiliation(s)
- Jinding Liu
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Wenyan Li
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Jiaqi Wang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Deqing Chen
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Zidong Liu
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Jie Shi
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Feng Cheng
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Zeqin Li
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Jianbo Ren
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Gengqian Zhang
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
| | - Keming Yun
- School of Forensic Medicine, Shanxi Medical University, Jinzhong, Shanxi, P. R. China
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