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MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...

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Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence
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mRNA-based skin identification for forensic applications.

Mijke Visser1, Dmitry Zubakov, Kaye N Ballantyne

  • 1Department of Forensic Molecular Biology, Erasmus MC University Medical Center Rotterdam, P.O. Box 2040, 3000 CA, Rotterdam, The Netherlands.

International Journal of Legal Medicine
|January 12, 2011
PubMed
Summary
This summary is machine-generated.

Forensic science now has a reliable messenger RNA (mRNA) method for identifying human skin cells. This highly sensitive approach uses three specific mRNA markers (CDSN, LOR, KRT9) and is stable over time.

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Published on: February 21, 2019

Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Accurate identification of human skin cells is crucial in forensic investigations.
  • Current methods for skin cell identification lack reliability and specificity.
  • Messenger RNA (mRNA) profiling offers a promising avenue for sensitive and specific forensic identification.

Purpose of the Study:

  • To develop and validate a novel mRNA-based method for reliable human skin cell identification in forensic contexts.
  • To identify specific mRNA markers with high expression in skin cells compared to other forensically relevant tissues.
  • To assess the sensitivity, specificity, and stability of the developed mRNA identification method.

Main Methods:

  • Candidate gene screening using expression databases and literature review.
  • Quantitative real-time PCR (qPCR) analysis of candidate skin-specific and reference genes in various human tissue samples.
  • Testing the sensitivity of the method on different amounts of skin material, including thumbprints.
  • Evaluating the time-wise stability of selected mRNA markers in stored skin samples.

Main Results:

  • Three genes (CDSN, LOR, KRT9) demonstrated significant overexpression in skin samples, serving as effective skin-specific mRNA markers.
  • ACTB was identified as a suitable reference gene for qPCR analysis due to its consistent high expression in both skin and body fluid samples.
  • The qPCR approach successfully detected minute amounts of skin material, including partial thumbprints.
  • Skin samples stored for up to 6.5 months yielded comparable results to fresh samples, indicating good mRNA stability.

Conclusions:

  • The study presents the first reliable mRNA-based method for human skin cell identification in forensic science.
  • The identified mRNA markers (CDSN, LOR, KRT9) and reference marker (ACTB) are highly sensitive and specific for skin identification.
  • This method holds significant potential for trace evidence analysis on touched objects in forensic casework.
  • Multiplex assays incorporating these skin-targeted mRNA markers are recommended for enhanced reliability in forensic samples.