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Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence
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Typing DNA profiles from previously enhanced fingerprints using direct PCR.

Jennifer E L Templeton1, Duncan Taylor2, Oliva Handt2

  • 1School of Biological Sciences, Flinders University, Bedford Park, Adelaide, South Australia, 5042, Australia.

Forensic Science International. Genetics
|June 3, 2017
PubMed
Summary

Direct PCR successfully generates DNA profiles from powdered fingerprints, even with limited DNA. This method enhances human identification by utilizing enhanced fingermarks without complex extraction steps.

Keywords:
FingermarksFingerprint powderHuman identificationShort tandem repeatTrace DNA‘Touch’ DNA

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Human Identification

Background:

  • Fingermarks are crucial for human identification through ridge patterns and DNA profiling.
  • Enhancing fingermarks with powders is standard but can impact DNA data.
  • Limited DNA in fingermarks necessitates efficient profiling methods.

Purpose of the Study:

  • To investigate the feasibility of generating DNA profiles from powdered fingermarks using direct PCR.
  • To assess the impact of common fingerprint powders on DNA profiling success.
  • To optimize a direct PCR method for low-template DNA from enhanced fingermarks.

Main Methods:

  • Direct PCR was employed, omitting traditional DNA extraction steps to preserve low-template DNA.
  • An optimized double-swabbing technique and specific swab media were utilized.
  • Four dactyloscopic fingerprint powders were tested: white hadonite, silver aluminium, HiFi Volcano silk black, and black magnetic powder.

Main Results:

  • 61% (98 out of 160) of treated fingermarks yielded 'up-loadable' DNA profiles to the Australian National Criminal Investigation DNA Database (NCIDD).
  • The direct PCR method, including optimized swabbing and reagent additions, was efficient, completed within 4 hours.
  • Minimal negative impact of the tested fingerprint powders on DNA profile generation was observed.

Conclusions:

  • Direct PCR offers a viable and efficient method for obtaining DNA profiles from enhanced fingermarks.
  • This technique maximizes the utility of limited DNA samples from powdered prints.
  • The study demonstrates the potential of direct PCR to improve human identification from forensic evidence.