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High-throughput sperm screening using one-step RT-qPCR: Improvement and re-evaluation
Seiji Kubo1, Keito Amai2, Fumitaka Nakano2
1Department of Clinical Laboratory and Molecular Pathology, Faculty of Medicine, Academic Assembly, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan; Forensic Science Laboratory, Ishikawa Prefectural Police Headquarters, 1-1 Kuratsuki, Kanazawa, 920-8553, Japan.
A new one-step RT-qPCR assay effectively detects protamine 2 (PRM2) mRNA for rapid sperm identification. This method enhances screening in sexual assault cases, offering a faster alternative to traditional microscopy.
Area of Science:
- Forensic Science
- Molecular Biology
- Biochemistry
Background:
- Microscopic analysis is the standard for sperm detection in sexual assault cases but is time-consuming.
- Sperm-specific mRNA markers, like protamine 2 (PRM2), offer potential for enhanced screening.
- Current molecular methods can be complex and lengthy, limiting high-throughput application.
Purpose of the Study:
- To develop a rapid, one-step RT-qPCR assay for detecting PRM2 mRNA.
- To establish a sensitive and specific method for identifying sperm in forensic samples.
- To improve the efficiency of sperm screening in sexual assault investigations.
Main Methods:
- Development of a one-step reverse transcription-quantitative real-time PCR (RT-qPCR) assay.
- Targeting the protamine 2 (PRM2) mRNA as a specific biomarker for sperm.
- Validation using simulated sexual assault case samples and varying semen volumes.
Main Results:
- The developed RT-qPCR assay demonstrated high specificity for PRM2 mRNA detection.
- The assay successfully identified sperm at low concentrations (as little as 0.01 μL of semen).
- The complete workflow, including RNA extraction and RT-qPCR, takes less than 90 minutes.
Conclusions:
- The one-step RT-qPCR assay provides a sensitive and rapid method for sperm identification.
- This assay significantly enhances the efficiency of sperm screening in forensic casework.
- The PRM2 mRNA detection strategy offers a promising advancement for sexual assault investigations.
