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Development and Validation of the AmpFℓSTR® MiniFilerTM PCR Amplification Kit: A MiniSTR Multiplex for the Analysis of Degraded and/or PCR Inhibited DNA

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DNA typing of degraded DNA samples can be a challenging task when using the current commercially available multiplex short tandem repeat (STR) analysis kits. However, the ability to type degraded DNA specimens improves by redesigning current STR marker amplicons such that smaller sized polymerase chain reaction (PCR) products are generated. In an effort to increase the amount of information derived from these types of DNA samples, the AmpFℓSTR® MiniFiler™ PCR Amplification Kit has been developed. The kit contains reagents for the amplification of eight miniSTRs which are the largest sized loci in the AmpFℓSTR® Identifiler® PCR Amplification Kit (D7S820, D13S317, D16S539, D21S11, D2S1338, D18S51, CSF1PO, and FGA). Five of these STR loci (D16S539, D21S11, D2S1338, D18S51, and FGA) also are some of the largest loci in the AmpFℓSTR® SGM Plus® kit. This informative nine-locus multiplex, which includes the gender-identification locus Amelogenin, has been validated according to the FBI/National Standards and SWGDAM guidelines. Our results demonstrate significant performance improvements in models of DNA degradation, PCR inhibition, and nonprobative samples when compared to the AmpFℓSTR® Identifiler® and SGM Plus® kits. These data support that the MiniFiler™ kit will increase the likelihood of obtaining additional STR information from forensic samples in situations in which standard STR chemistries fail to produce complete profiles.
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Keywords: CSF1PO; D13S317; D16S539; D18S51; D21S11; D2S1338; D7S820; DNA typing; FGA; forensic science; hematin; humic acid; mini short tandem repeat

Document Type: Research Article

Affiliations: Applied Biosystems, 850 Lincoln Centre Dr., Foster City, CA 94404.

Publication date: July 1, 2008

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