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Alternative direct-to-amplification sperm cell lysis techniques for sexual assault sample processing.
Sarah K Schellhammer1, Brittany C Hudson1,2, Jordan O Cox1
1Department of Forensic Science, Virginia Commonwealth University, Richmond, Virginia, USA.
Journal of Forensic Sciences
|March 14, 2022
Summary
This study explored alternative sperm lysis methods to address sexual assault kit backlogs. Alkaline lysis is recommended for efficient, high-quality DNA profiling, saving time and reducing costs compared to traditional techniques.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Sexual assault kit backlogs are a significant issue in the United States.
- Traditional sperm cell lysis methods are time-consuming and inefficient, hindering forensic analysis.
- Sensitive DNA analysis methods exacerbate the need for efficient sample processing.
Purpose of the Study:
- To evaluate seven alternative sperm cell lysis techniques.
- To identify a method that efficiently lyses sperm and yields high-quality DNA profiles.
- To reduce the time, labor, and cost associated with sperm DNA extraction.
Main Methods:
- Microscopic examination of sperm cell lysis.
- DNA quantification using forensicGEM™ Sperm as a control.
- Short tandem repeat (STR) amplification using 0.25 ng of DNA.
- Comparison of unpurified lysates from alternative methods with a traditional control.
Main Results:
- Casework Direct and alkaline techniques effectively lysed all spermatozoa.
- All tested methods showed comparable DNA quantification results to the control.
- Casework Direct, alkaline, and NP-40 methods produced high-quality STR profiles without purification.
- These methods yielded acceptable mean STR peak heights and interlocus balance.
Conclusions:
- Casework Direct, alkaline, and NP-40 methods efficiently lyse spermatozoa and generate high-quality STR profiles.
- Alkaline lysis is the recommended alternative due to its efficiency, quality, time savings, and cost-effectiveness.
- This research offers a viable solution to improve sexual assault kit processing and reduce backlogs.
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