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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.

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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.