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Mixture Deconvolution with Massively Parallel Sequencing Data: Microhaplotypes Versus Short Tandem Repeats.

Monica Giuffrida1, Pedro Rodrigues1, Zehra Köksal1

  • 1Section of Forensic Genetics, Department of Forensic Medicine, Faculty of Health Sciences, University of Copenhagen, 11 Frederik V's Vej, DK-2100 Copenhagen, Denmark.

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Summary
This summary is machine-generated.

Microhaplotypes (MHs) outperformed short tandem repeats (STRs) in deconvoluting complex forensic DNA mixtures. This new workflow using MPSproto software provides more accurate results for crime scene sample interpretation.

Keywords:
MPSprotoforensic geneticsmicrohaplotypenext-generation sequencingprobabilistic genotyping softwareshort tandem repeat

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Area of Science:

  • Forensic genetics
  • Genomic analysis
  • DNA mixture interpretation

Background:

  • Interpreting crime scene DNA mixtures is crucial in forensic genetics.
  • A novel workflow was developed for deconvoluting microhaplotypes (MHs) and short tandem repeats (STRs).

Purpose of the Study:

  • To develop and evaluate a workflow for mixture deconvolution using MPSproto v0.9.7.
  • To compare the performance of MHs and STRs in analyzing complex DNA mixtures.

Main Methods:

  • Utilized sequencing data from a 74-plex MH panel and a 26-plex STR commercial kit.
  • Created simulated mixtures (2- and 3-person) and analyzed real mixture samples.
  • Employed the MPSproto v0.9.7 software for probabilistic genotyping and deconvolution.

Main Results:

  • MH profiles yielded more complete deconvolutions with fewer incorrect genotype calls compared to STR profiles.
  • Contributor proportion estimates were more accurate for MHs than STRs, especially in challenging mixture scenarios.
  • MHs demonstrated superior performance in both simulated and real forensic DNA mixtures.

Conclusions:

  • Microhaplotypes (MHs) offer enhanced accuracy and completeness over STRs for forensic DNA mixture analysis.
  • The developed MPSproto workflow effectively deconvolutes complex mixtures, improving forensic genetic interpretations.
  • MHs represent a promising advancement for forensic science, particularly in challenging mixture cases.