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Fan Q, Li L, Yang H, Xu D, Wang Y, Jin B, Du B. Development and validation of a new multiplex panel using SNaPshot-based DIP-TriSNP markers for forensic DNA mixtures. Electrophoresis 2024. [PMID: 38651903 DOI: 10.1002/elps.202300215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 01/28/2024] [Accepted: 03/10/2024] [Indexed: 04/25/2024]
Abstract
Short tandem repeat analysis is challenging when dealing with unbalanced mixtures in forensic cases due to the presence of stutter peaks and large amplicons. In this research, we propose a novel genetic marker called DIP-TriSNP, which combines deletion/insertion polymorphism (DIP) with tri-allelic single nucleotide polymorphism in less than 230 bp length of human genome. Based on multiplex PCR and SNaPShot, a panel, including 14 autosomal DIP-TriSNPs and one Y chromosomal DIP-SNP, had been developed and applied to genotyping 102 unrelated Han Chinese individuals in Sichuan of China and simulated a mixture study. The panel sensitivity can reach as low as 0.1 ng DNA template, and the minor contributor of DNA can be detected with the highest ratio of 19:1, as indicated by the obtained results. In the Sichuan Han population, the cumulative probability of informative genotypes reached 0.997092, with a combined power of discrimination of 0.999999998801. The panel was estimated to detect more than two alleles in at least one locus in 99.69% of mixtures of the Sichuan Han population. In conclusion, DIP-TriSNPs have shown promising as an innovative DNA marker for identifying the minor contributor in unbalanced DNA mixtures, offering advantages such as short amplifications, increased polymorphism, and heightened sensitivity.
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Affiliation(s)
- Qingwei Fan
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Ling Li
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Huiling Yang
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Dongdong Xu
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Yun Wang
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Bo Jin
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
| | - Bing Du
- Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
- Forensic Science Service Center of North Sichuan Medical College, Nanchong, Sichuan Province, P. R. China
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