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Rapid microfluidic analysis of a Y-STR multiplex for screening of forensic samples.
Analytical and Bioanalytical Chemistry 2017 Februrary
In this paper, we demonstrate a rapid analysis procedure for use with a small set of rapidly mutating Y chromosomal short tandem repeat (Y-STR) loci that combines both rapid polymerase chain reaction (PCR) and microfluidic separation elements. The procedure involves a high-speed polymerase and a rapid cycling protocol to permit PCR amplification in 16 min. The resultant amplified sample is next analysed using a short 1.8-cm microfluidic electrophoresis system that permits a four-locus Y-STR genotype to be produced in 80 s. The entire procedure takes less than 25 min from sample collection to result. This paper describes the rapid amplification protocol as well as studies of the reproducibility and sensitivity of the procedure and its optimisation. The amplification process utilises a small high-speed thermocycler, microfluidic device and compact laptop, making it portable and potentially useful for rapid, inexpensive on-site genotyping. The four loci used for the multiplex were selected due to their rapid mutation rates and should proved useful in preliminary screening of samples and suspects. Overall, this technique provides a method for rapid sample screening of suspect and crime scene samples in forensic casework. Graphical abstract ᅟ.
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