Development and validation of InnoQuant™, a sensitive human DNA quantitation and degradation assessment method for...

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Forensic casework requires improved methods for analyzing compromised DNA samples.
• Current methods for DNA quantification and inhibition assessment exist, but lack degradation analysis.
• Advanced techniques like mini STR, SNP, and Alu markers enable analysis of degraded DNA.

Purpose of the Study:

• To develop and validate a multiplex system for simultaneous assessment of DNA quantity, inhibition, and degradation in forensic samples.
• To provide forensic analysts with a tool to optimize DNA testing strategies for compromised samples.
• To enhance the first-pass success rate in forensic DNA analysis.

Main Methods:

• Utilized a multiplex system (InnoQuant™) with two independent retrotransposon genomic targets.
• Quantified both an 80bp "short" and a 207bp "long" DNA fragment to calculate a "Degradation Index".
• Incorporated a synthetic target as an internal positive control (IPC) for inhibition assessment.

Main Results:

• The developed system accurately quantifies DNA quantity, assesses inhibition, and determines degradation levels.
• The "Degradation Index" effectively predicted the loss of STR markers and alleles with increasing degradation.
• The IPC confirmed the presence or absence of PCR inhibitors in test samples.

Conclusions:

• The multiplex DNA assessment system provides a valuable qualitative and quantitative tool for forensic casework.
• This system enables informed decisions regarding DNA test kit selection and target DNA input for compromised samples.
• Implementation of this tool can significantly improve the efficiency and success rate of forensic DNA analysis.