Related Experiment Video
Updated: Jul 15, 2025
11:49
Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence
Published on: March 9, 2015
15.8K
Alternative direct-to-amplification cell lysis techniques for forensically relevant non-sperm cells.
Rhea Arya1, Brittany C Hudson1,2, Tracey Dawson Green1
1Department of Forensic Science, Virginia Commonwealth University, Richmond, Virginia, USA.
Journal of Forensic Sciences
|October 2, 2023
Summary
A new method using Mammalian Protein Extraction Reagent (M-PER™) efficiently lyses non-sperm cells in sexual assault samples. This direct lysis technique speeds up DNA analysis by eliminating purification steps, aiding in reducing evidence backlogs.
Area of Science:
- Forensic Science
- Molecular Biology
- Biochemistry
Background:
- Sexual assault evidence collection kits face significant backlogs due to lengthy laboratory DNA analysis.
- Current DNA workflows require time-consuming differential lysis and complex mixture analysis.
- A direct lysis method for sperm cells exists, but not for non-sperm cells.
Purpose of the Study:
- To identify a rapid, cost-effective lysis method for non-sperm cells in sexual assault samples.
- To find an alternative to traditional differential lysis that bypasses DNA purification steps.
- To optimize DNA extraction from vaginal swabs for improved forensic analysis.
Main Methods:
- Vaginal swab samples were lysed using various reagents, including alkaline buffers (25-200 mM NaOH), RIPA buffer, M-PER™, digitonin buffer, and urea/thiourea buffer.
- Lysates were quantified using Quantifiler® Trio to assess lysis efficiency.
- Short tandem repeat (STR) profiles were analyzed to evaluate the quality of DNA amplification.
Main Results:
- The alkaline (25 mM NaOH) and M-PER™ methods effectively lysed vaginal epithelial cells with minimal sperm cell lysis.
- M-PER™ demonstrated promising results in STR profile analysis, including high allele detection and good peak balance.
- The M-PER™ method produced amplification-ready lysates without requiring a DNA purification step.
Conclusions:
- M-PER™ is a viable alternative to traditional differential lysis for non-sperm cells in sexual assault investigations.
- This method offers a faster and simpler approach to DNA analysis, potentially reducing evidence processing times.
- Implementing M-PER™ could help alleviate the backlog of sexual assault evidence collection kits.
Related Concept Videos
01:32Tissue Homogenization and Cell Lysis
7.6K
Tissue homogenization involves disintegrating tissue architecture and lysing cells, and is an early step in isolating and analyzing cellular components. The method used for homogenization depends on the sample type, the amount of sample available, the analyte to be obtained, and the sensitivity of the method. These methods are broadly classified as mechanical and non-mechanical methods.
Mechanical methods of tissue homogenization
These methods rely on applying external physical force to disrupt...
Mechanical methods of tissue homogenization
These methods rely on applying external physical force to disrupt...
7.6K
01:24DNA Isolation
39.3K
DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
39.3K