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Related Experiment Videos

Y-chromosome STR system, Y-PLEX 12, for forensic casework: development and validation.

Jaiprakash G Shewale1, Huma Nasir, Elaine Schneida

  • 1ReliaGene Technologies, Inc. 5525 Mounes St. Suite 101, New Orleans, LA 70123, USA.

Journal of Forensic Sciences
|December 1, 2004
PubMed
Summary

The Y-PLEX 12 system reliably identifies males using eleven Y-chromosome short tandem repeat (STR) loci and Amelogenin. This validated forensic tool offers high sensitivity and accuracy for human identification and male lineage cases.

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Area of Science:

  • Forensic Science
  • Genetics
  • Molecular Biology

Background:

  • Short tandem repeat (STR) analysis is crucial for human identification.
  • Y-chromosome STR (Y-STR) systems are valuable for male lineage tracing and complex mixture analysis.
  • The Y-PLEX 12 system was developed to enhance capabilities in forensic DNA analysis.

Purpose of the Study:

  • To validate the Y-PLEX 12 system for simultaneous amplification of eleven Y-STR loci and Amelogenin.
  • To assess the sensitivity, reliability, and specificity of the Y-PLEX 12 system for forensic applications.
  • To evaluate the performance of Y-PLEX 12 in mixture samples and its specificity against non-human primate DNA.

Main Methods:

  • Simultaneous amplification of eleven Y-STR loci (DYS392, DYS390, DYS385 a/b, DYS393, DYS389I, DYS391, DYS389II, DYS19, DYS439, DYS438) and Amelogenin.

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  • Validation studies conducted according to DNA Advisory Board (DAB) Quality Assurance Standards.
  • Sensitivity testing, stutter analysis, mixture sample analysis, and species specificity testing.

    • Main Results:

    • The Y-PLEX 12 system demonstrated a minimal sensitivity of 0.1 ng of male DNA.
    • Full male profiles were obtained in mixture samples with up to 0.5 ng male DNA and 400 ng female DNA.
    • The system showed specificity for human DNA, with no complete profiles generated from tested primate samples.

    Conclusions:

    • The Y-PLEX 12 system is a sensitive, valid, reliable, and robust multiplex system for forensic analysis.
    • It is suitable for human identification and male lineage identification cases.
    • Amelogenin effectively serves for gender identification and as an internal PCR control without hindering Y-STR amplification.