Evaluating the performance of five up-to-date DNA/RNA co-extraction methods for forensic application

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• RNA evidence analysis is increasingly vital in forensics.
• Forensic samples are often small, necessitating high-yield DNA and RNA extraction methods.
• Optimizing DNA/RNA co-extraction is crucial for forensic applications.

Purpose of the Study:

• To identify the optimal DNA/RNA co-extraction workflow for forensic samples.
• To evaluate the performance of various extraction methods on blood and saliva.
• To compare DNA and RNA yields, STR genotyping, and mRNA profiling results.

Main Methods:

• Evaluated three frequently-used DNA/RNA co-extraction methods.
• Assessed two novel DNA/RNA co-extraction approaches.
• Compared with a manual phenol/chloroform RNA-only extraction method.
• Utilized blood and saliva samples for analysis.

Main Results:

• Two frequently-used co-extraction methods, combining commercial DNA and RNA kits, demonstrated superior performance.
• Extensive optimization is required, as indicated by poor results from two new approaches.
• Analysis included RNA and DNA quantities, STR genotyping, and mRNA profiling.

Conclusions:

• Commercially available DNA and RNA extraction kits, when appropriately combined, offer the best performance for forensic DNA/RNA co-extraction.
• The efficacy of co-extraction methods is highly dependent on specific kit combinations and requires optimization.
• Newer methods require further development and validation for reliable forensic use.