Abstract
Massively parallel sequencing (MPS) technologies enable the simultaneous analysis of short tandem repeats (STRs) and single nucleotide polymorphisms (SNPs). MPS also enables the detection of alleles of the minor contributors in imbalanced DNA mixtures. In this study, 59 STRs (amelogenin, 27 autosomal STRs, 7 X-STRs, and 24 Y-STRs) and 94 identity-informative SNPs of 119 unrelated Taiwanese (50 men, 69 women) were sequenced using a commercial MPS kit. Forty-eight nondegraded and 44 highly degraded two-person artificial DNA mixtures with various minor to major ratios (1:9, 1:19, 1:29, 1:39, 1:79, and 1:99) were analyzed to examine the performance of this system for detecting the alleles of the minor contributors in DNA mixtures. Likelihood ratios based on continuous model were calculated using the EuroForMix for DNA mixture interpretation. The STR and SNP genotypes of these 119 Taiwanese were obtained. Several sequence variants of STRs were observed. Using EuroForMix software based on the sequence data of autosomal STRs and autosomal SNPs, 97.9% (47/48) and 97.7% (42/43) of minor donors were accurately inferred among the successfully analyzed nondegraded and degraded DNA mixtures, respectively. In conclusion, combined with EuroForMix software, this commercial kit is effective for assignment of the minor contributors in nondegraded and degraded DNA mixtures.
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Acknowledgements
The authors thank the National Center for Genome Medicine at Academia Sinica, Taiwan, for performance of genome-wide analysis with Genome-Wide Human SNP Array 6.0. This Center was supported by grants from the National Core Facility Program for Biotechnology of National Science Council, Taiwan, R.O.C. We acknowledge Mr. Chun-Yen Lin and Ms. Tsun-Ying Huang for technical support on degraded DNA analysis. We thank Jia-Ching Hwa for manuscript typing and partial data calculation. Special thanks are given to the hundreds of individuals who volunteered to provide biological samples for allele frequency data studies.
Funding
This work was supported by the Ministry of Science and Technology, Taiwan, R.O.C. [grant numbers MOST 103-2320-B-002-023-MY2], and National Taiwan University Hospital Taiwan, R.O.C. [grant numbers NTUH103-S2398].
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Hwa, HL., Wu, MY., Chung, WC. et al. Massively parallel sequencing analysis of nondegraded and degraded DNA mixtures using the ForenSeq™ system in combination with EuroForMix software. Int J Legal Med 133, 25–37 (2019). https://doi.org/10.1007/s00414-018-1961-y
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DOI: https://doi.org/10.1007/s00414-018-1961-y