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Related Experiment Videos

Analysis of non-suspect samples lacking visually identifiable sperm using a Y-STR 10-plex.

Cassie L Johnson1, Robert C Giles, Joseph H Warren

  • 1Orchid Cellmark-Dallas, 2600 Stemmons Freeway, Suite 133, Dallas, TX 75207, USA. cjohnson@orchid.com

Journal of Forensic Sciences
|October 18, 2005
PubMed
Summary

Y-STR analysis can detect male DNA from sexual assault evidence, even without visible spermatozoa. This method aids in investigating cases where autosomal STR interpretation is difficult, improving forensic casework.

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Area of Science:

  • Forensic Science
  • Genetics
  • Molecular Biology

Background:

  • Autosomal STR genotype interpretation can be challenging in sexual assault investigations.
  • Y-STRs (Y-chromosome Short Tandem Repeats) offer a valuable tool for analyzing male DNA in such cases.
  • Detection of male DNA is crucial even when spermatozoa are not microscopically identifiable.

Purpose of the Study:

  • To assess the efficacy of Y-STR analysis for detecting male DNA from compromised sexual assault evidence.
  • To determine the success rate of Y-STR profiling in samples lacking visible spermatozoa but positive for seminal fluid.

Main Methods:

  • Differential extraction was performed on 45 non-suspect sexual assault samples.
  • Analysis utilized 10 Y-STR loci.

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  • Samples were screened for human seminal fluid and spermatozoa via microscopic examination.

    • Main Results:

    • Y-STR data were successfully obtained in 86.2% of epithelial or sperm fractions.
    • Incomplete profiles yielded an average of 5 Y-STR loci per sample.
    • Successful profiling was achieved despite the absence of visually identifiable spermatozoa.

    Conclusions:

    • Y-STR analysis is a viable method for obtaining male DNA profiles from sexual assault evidence lacking spermatozoa.
    • This technique can overcome challenges associated with autosomal STR interpretation in compromised samples.
    • Inclusion of Y-STR loci in databases like CODIS is recommended for solving non-suspect sexual assault cases.