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Toward Analysis at the Point of Need: A Digital Microfluidic Approach to Processing Multi-Source Sexual Assault

Mohamed Elsayed1,2,3, Leticia Bodo2,3, Christine Gaoiran4

  • 1Institute of Biomedical Engineering, University of Toronto, 164 College Street, Toronto, ON, M5S 3E2, Canada.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 4, 2024
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Summary
This summary is machine-generated.

This study introduces automated, miniaturized digital microfluidics (DMF) for forensic DNA analysis of sexual assault samples. The method shows potential for point-of-need processing, enabling faster results outside traditional laboratories.

Keywords:
differential digestiondigital microfluidicsrapid DNA analysis

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Area of Science:

  • Forensic Science
  • Biotechnology
  • Analytical Chemistry

Background:

  • Forensic case samples from sexual assaults often contain mixed DNA profiles, complicating analysis.
  • Current methods require laboratory-based separation of sperm and non-sperm DNA sources prior to short-tandem repeat (STR) profiling.
  • Processing sexual assault samples can be time-consuming and resource-intensive.

Purpose of the Study:

  • To develop and demonstrate an automated, miniaturized method for DNA separation from sexual assault samples.
  • To evaluate the efficacy of digital microfluidics (DMF) for pre-processing forensic samples.
  • To explore the potential for point-of-need analysis of sexual assault evidence.

Main Methods:

  • Digital microfluidics (DMF) was employed for automated and miniaturized separation of DNA from sexual assault samples.
  • Vaginal swab samples were collected at different time points post-coitus (PC): up to 12 hours and 24-72 hours.
  • Short-tandem repeat (STR) profiling was performed on the processed samples.

Main Results:

  • The DMF method successfully identified single-source (male) STR profiles from samples collected up to 12 hours PC.
  • Mixed STR profiles were identified from samples collected 24-72 hours PC, indicating potential for further optimization or data deconvolution.
  • The automated process demonstrated feasibility for sample pre-processing.

Conclusions:

  • An automated, miniaturized sample pre-processing method using DMF for sexual assault samples has been demonstrated.
  • This technology has the potential to enable processing of sexual assault samples outside of traditional forensic laboratories.
  • Integration with Rapid DNA Analysis could facilitate point-of-need processing in various settings, such as hospitals and police offices.