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Spermatozoa identification by the 3-plex MSRE-PCR assay: a collaborative exercise.

Kuo-Lan Liu¹, Li-Chin Tsai², Yu-Chih Lin³

¹Forensic Examination Division, Criminal Investigation Bureau, National Police Agency, No.5 Lane 553, Chung Hsiao East Road Section 4, Xinyi District, Taipei, 11072, Taiwan, Republic of China.

International Journal of Legal Medicine

|October 31, 2021

Summary

A new 3-plex MSRE-PCR assay accurately identifies spermatozoa in forensic samples. This methylation-sensitive restriction enzyme-PCR method offers improved sensitivity and specificity for sexual assault investigations.

Keywords:

3-plex MSRE-PCR Collaborative exercise Sexual assault Spermatozoa identification

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Area of Science:

Forensic Science
Molecular Biology
Genetics

Background:

Accurate identification of semen and spermatozoa is vital in sexual assault investigations.
Current methods face limitations in specificity and sensitivity, especially with aged samples or low sperm counts.
A previously developed 3-plex MSRE-PCR assay offers enhanced sensitivity and specificity for spermatozoa identification.

Purpose of the Study:

To assess the reproducibility and feasibility of the 3-plex MSRE-PCR assay in a collaborative, inter-laboratory trial.
To evaluate the assay's suitability for integration into routine forensic casework.

Main Methods:

Reagents and protocols for the 3-plex MSRE-PCR assay were distributed to six participating forensic laboratories.
Laboratories performed the assay on provided samples alongside conventional forensic methods.
Results were collected via questionnaire to assess concordance and performance.

Main Results:

All six participating laboratories reported concordant and correct identification of spermatozoa.
The 3-plex MSRE-PCR assay demonstrated high reproducibility and feasibility across different laboratory settings.
The assay proved readily accessible for integration into existing forensic casework.

Conclusions:

The collaborative trial successfully verified the robustness of the 3-plex MSRE-PCR assay.
This assay is a viable and accessible tool for enhancing spermatozoa detection in forensic investigations.
The findings support the adoption of this advanced molecular technique in routine forensic practice.