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• W3080349211 endingPage "102373" @default.
• W3080349211 startingPage "102373" @default.
• W3080349211 abstract "Short tandem repeat (STR) analysis is prone to failure as DNA is frequently damaged by various environmental factors; hence, increasing the number of starting templates may constitute a feasible approach to improve STR profiling success. Whole genome amplification (WGA) is often applied to bolster starting template quantity. Moreover, WGA can reportedly be used on degraded DNA samples in forensics. Therefore, we utilized a PCR-based WGA method, termed “modified improved primer extension preamplification” (mIPEP), prior to STR analysis of degraded DNA, as this method is less affected by DNA quantity and quality than most others. Saliva from four volunteers was dried on glass fiber filter papers (paper) and glass slides (glass) and irradiated with UVA light (365 nm). The mIPEP method was initiated using 5, 0.5, and 0.05 ng of DNA following DNA extraction. The DNA degradation index (DI) was calculated based on the ratio of 129 to 41 bp DNA fragments; lower numbers indicate higher degradation. Following mIPEP, STR analysis was performed using the AmpFlSTR Identifiler PCR amplification kit. The number of detectable STR loci, with and without mIPEP, decreased according to reduced DI in a different manner for the various DNA concentrations extracted from paper and glass. Specifically, for the 5 ng DNA sample on paper, at a DI < 0.2, the number of detectable STR loci was greater with mIPEP than without it, owing to fewer locus drop-outs. Similarly, the 0.05 ng DNA sample deposited on paper, at DI ≥ 0.7, exhibited higher numbers of detectable STR loci when prepared using mIPEP owing to fewer allele drop-outs. Moreover, among samples deposited on glass, the 0.05 ng DNA sample at DI ≥ 0.4 afforded a larger number of detectable STR loci when prepared using mIPEP than those without mIPEP, owing to fewer locus drop-outs. These findings suggest that performing mIPEP in accordance with sample DNA condition (e.g., quantity and quality) may lead to increased success of STR analysis. Notably, the conditions identified as most responsive to mIPEP were consistent across both UVA-irradiated and environmentally-damaged sample states. Taken together, our results suggest that applying mIPEP would be beneficial to obtain improved STR profiles under conditions involving severely degraded samples with large quantities of DNA, or with small quantities of DNA albeit with slight degradation." @default.
• W3080349211 created "2020-09-01" @default.
• W3080349211 creator A5054533489 @default.
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• W3080349211 date "2020-11-01" @default.
• W3080349211 modified "2023-09-23" @default.
• W3080349211 title "Effectiveness of whole genome amplification prior to short tandem repeat analysis for degraded DNA" @default.
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• W3080349211 doi "https://doi.org/10.1016/j.fsigen.2020.102373" @default.
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