A multiplex (m)RNA-profiling system for the forensic identification of body fluids and contact traces

Forensic Science International. Genetics
Alexander LindenberghTitia Sijen

Abstract

In current forensic practice, information about the possible biological origin of forensic traces is mostly determined using protein-based presumptive testing. Recently, messenger RNA-profiling has emerged as an alternative strategy to examine the biological origin. Here we describe the development of a single multiplex mRNA-based system for the discrimination of the most common forensic body fluids as well as skin cells. A DNA/RNA co-isolation protocol was established that results in DNA yields equivalent to our standard in-house validated DNA extraction procedure which uses silica-based columns. An endpoint RT-PCR assay was developed that simultaneously amplifies 19 (m)RNA markers. This multiplex assay analyses three housekeeping, three blood, two saliva, two semen, two menstrual secretion, two vaginal mucosa, three general mucosa and two skin markers. The assay has good sensitivity as full RNA profiles for blood, semen and saliva were obtained when using ≥0.05 μL body fluid starting material whereas full DNA profiles were obtained with ≥0.1 μL. We investigated the specificity of the markers by analysing 15 different sets of each type of body fluid and skin with each set consisting of 8 individuals. Since skin markers have no...Continue Reading

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Citations

Mar 26, 2013·International Journal of Legal Medicine·Heyi YangDonald Siegel
Aug 14, 2013·Science & Justice : Journal of the Forensic Science Society·Joyce HarteveldTitia Sijen
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