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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Funding
This work was funded by the National Natural Science Foundation of China [30900593 and 81701868], the Natural Science Foundation of Shanxi Province, China [201601D011091], and Shanxi Provincial Key Research and Development Project (CN) [201803D31069].
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Liu, J., Hao, T., Cheng, X. et al. DIP-microhaplotypes: new markers for detection of unbalanced DNA mixtures. Int J Legal Med 135, 13–21 (2021). https://doi.org/10.1007/s00414-020-02288-y
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DOI: https://doi.org/10.1007/s00414-020-02288-y