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Published on: June 21, 2018
Forensic validation of the SNPforID 52-plex assay
Esther Musgrave-Brown1, David Ballard, Kinga Balogh
1Centre for Haematology, ICMS, Barts & the London, Queen Mary's School of Medicine & Dentistry, London, United Kingdom. e.musgrave-brown@qmul.ac.uk
Forensic Science International. Genetics
|December 17, 2008
Summary
Single nucleotide polymorphism (SNP) typing offers advantages for forensic genetics, especially with degraded DNA samples. A 52-plex SNP assay showed improved performance over short tandem repeat (STR) typing in challenging casework scenarios.
Area of Science:
- Forensic genetics
- Molecular biology
- Human identification
Background:
- Single nucleotide polymorphisms (SNPs) offer advantages over short tandem repeats (STRs) in forensic genetics, including high-throughput typing and better analysis of degraded samples.
- The European SNPforID consortium developed a 52-plex SNP assay for forensic analysis.
Purpose of the Study:
- To validate a 52-plex SNP assay for forensic casework by testing its reliability on challenging DNA samples.
- To compare the performance of the SNP assay against traditional STR typing methods.
Main Methods:
- A multiplex assay amplifying 52 SNPs in a single reaction, followed by two single base extension (SBE) reactions detected via capillary electrophoresis.
- Testing of 40 DNA extracts with varying quality (low copy number, degradation) across five participating laboratories.
- Comparison of SNP typing results with Powerplex 16 STR typing results from the same extracts.
Main Results:
- The 52-plex SNP assay demonstrated superior performance compared to STR typing on degraded DNA samples and samples that were both degraded and of low quantity.
- The SNP assay's ability to successfully type good quality, low copy number extracts was lower than STR typing.
- Issues with contamination and primer quality were identified as additional challenges.
Conclusions:
- SNP analysis offers distinct advantages over STR analysis for challenging forensic samples, particularly those that are degraded.
- Further optimization is needed to address limitations in typing low copy number samples and resolve technical issues like contamination and primer quality.
