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Improving DNA data exchange: validation studies on a single 6 dye STR kit with 24 loci
Pablo Martín1, Lourdes Fernández de Simón1, Gracia Luque1
1National Institute of Toxicology and Forensic Sciences, Madrid Department, Biology Service, José Echegaray 4, Las Rozas 28232, Madrid, Spain.
Forensic Science International. Genetics
|August 2, 2014
Summary
A new multiplex STR amplification system was validated for forensic casework. This system enhances discrimination power and ensures compatibility with existing DNA databases for improved DNA data exchange.
Area of Science:
- Forensic Science
- Genetics
- Molecular Biology
Background:
- The need for a new multiplex STR amplification system arose from the adoption of the European Standard Set (ESS) of 12 STR markers in 2009.
- Compatibility with the Spanish national DNA database, containing approximately 200,000 profiles based on 13 CODIS core STR loci plus D19S433 and D2S1338, was crucial.
- A single STR amplification system for simultaneous analysis of 21 STR markers, including CODIS and ESS core loci plus additional markers, was proposed.
Purpose of the Study:
- To test and validate a single STR amplification system for simultaneous analysis of 21 STR markers.
- To evaluate the performance of the GlobalFiler™ PCR Amplification Kit, a 6-dye STR kit prototype, for forensic casework.
- To ensure compatibility and information exchange with historical DNA profiles in national databases.
Main Methods:
- Validation studies were conducted on the GlobalFiler™ PCR Amplification Kit using a 3500 genetic analyzer.
- Analysis included key forensic parameters: analytical and stochastic thresholds, heterozygous balance, stutter, precision, accuracy, repeatability, reproducibility, genotype concordance, DNA mixtures, species specificity, and stability.
- The system maintained primer sequences from previous kits (Identifiler®/NGM SElect™) for 21 STR markers, except for TPOX, to maximize concordance.
Main Results:
- The GlobalFiler™ system demonstrated equivalent overall performance to previous forensic STR PCR kits.
- Enhanced discrimination power was observed, leading to improved match efficiency.
- The system showed reduced chances of adventitious matches during DNA data exchange.
Conclusions:
- The validated GlobalFiler™ system is suitable for forensic casework.
- The system offers enhanced discrimination power and compatibility with existing DNA databases.
- This advancement facilitates more efficient and reliable DNA data exchange among national databases.
