Developmental validation of VeriFiler™ Plus PCR Amplification Kit: A 6-dye multiplex assay designed for casework...

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• The VeriFiler™ Plus kit utilizes a 6-dye multiplex assay for amplifying 23 autosomal and 2 sex-identification markers.
• The assay is designed to meet the requirements of the Chinese National autosomal DNA database and the expanded CODIS (Combined DNA Index System).
• An improved Master Mix with TED™ dye enhances sensitivity and accommodates higher sample volumes for challenging casework samples.

Purpose of the Study:

• To conduct a developmental validation study of the VeriFiler™ Plus PCR Amplification Kit following SWGDAM guidelines.
• To assess the kit's performance, robustness, and reliability for human identification using casework DNA samples.

Main Methods:

• The study followed SWGDAM guidelines for developmental validation.
• Evaluated PCR-based performance, sensitivity, species specificity, stability, precision, reproducibility, repeatability, concordance, stutter, DNA mixtures, and mock casework samples.

Main Results:

• The VeriFiler™ Plus kit demonstrated robust performance across all tested parameters.
• High sensitivity was achieved, enabling maximum information recovery from degraded, inhibited, and touch DNA samples.
• The multiplex assay design was validated, confirming its suitability for forensic casework.

Conclusions:

• The VeriFiler™ Plus kit is a robust and reliable assay for human identification.
• Its enhanced sensitivity and performance on challenging samples make it suitable for forensic casework applications.
• The kit meets the requirements for national and international DNA databases.