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Enhanced DNA mixture deconvolution of sexual offense samples using the DEPArray™ system.

Victoria R Williamson1, Taylor M Laris1, Rita Romano2

  • 1Forensic & National Security Sciences Institute, Syracuse University, 100 College Place 120 Life Science Building, Syracuse, New York, 13244, USA.

Forensic Science International. Genetics
|March 31, 2018
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Summary

Single cell separation technology effectively deconvolutes complex DNA mixtures in forensic samples. The DEPArray™ system enhances DNA analysis, yielding more single-source profiles and simplifying interpretation of challenging forensic evidence.

Keywords:
DNA mixtureDeconvolutionDifferential extractionSexual offenseSingle-cell analysisSpermatozoa

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Interpreting DNA mixtures from forensic evidence is challenging.
  • Selective single-cell analysis is crucial for deconvulting heterogeneous DNA sources, especially in sexual offense cases.
  • Current methods like differential extraction can be labor-intensive and may not fully resolve complex mixtures.

Purpose of the Study:

  • To evaluate the effectiveness of the DEPArray™ system for single cell separation in forensic DNA mixture analysis.
  • To demonstrate how this technology can enhance standard forensic biology workflows.
  • To improve the processing and interpretation of challenging forensic samples, including low template DNA and sexual offense evidence.

Main Methods:

  • Utilized the DEPArray™ system for single cell isolation and purification from forensic samples.
  • Compared the DEPArray™ workflow with standard differential extraction methods.
  • Analyzed the resulting DNA profiles for single-source identification and mixture deconvolution.

Main Results:

  • The DEPArray™ system enabled purification of sperm and epithelial cell fractions without differential extraction.
  • Sperm profiles were obtained from 96.2% of DEPArray™ processed samples, compared to 32.1% with differential extraction.
  • The DEPArray™ workflow reduced the number of mixture samples and eliminated the need for confirmatory tests and qPCR-based DNA quantification.

Conclusions:

  • Single cell separation technology, specifically the DEPArray™ system, significantly improves the analysis of complex DNA mixtures in forensic science.
  • This technology enhances the standard forensic workflow by increasing the success rate of obtaining single-source profiles and simplifying interpretation.
  • The DEPArray™ system offers a more efficient and effective approach for processing challenging forensic samples, leading to more definitive results.