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Developing a SNP panel for forensic identification of individuals.

Kenneth K Kidd1, Andrew J Pakstis, William C Speed

  • 1Department of Genetics, Yale University School of Medicine, New Haven, CT 06520, USA. Kenneth.Kidd@yale.edu <Kenneth.Kidd@yale.edu>

Forensic Science International
|December 20, 2005
PubMed
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Forensic science will utilize single nucleotide polymorphisms (SNPs) for human identification. This study identifies highly informative SNPs with consistent allele frequencies across global populations, crucial for accurate forensic match probabilities.

Area of Science:

  • Forensic genetics
  • Population genetics
  • Human identification

Background:

  • Single nucleotide polymorphisms (SNPs) offer potential for forensic applications.
  • Population-specific allele frequencies pose challenges for accurate forensic identification.
  • Research is needed to establish robust scientific foundations for SNP-based forensics.

Purpose of the Study:

  • To develop an efficient strategy for identifying and characterizing SNPs suitable for forensic identification.
  • To evaluate the population genetics and informativeness of selected SNPs across diverse global populations.
  • To establish a preliminary panel of SNPs for reliable human identification with low match probabilities.

Main Methods:

  • An efficient strategy was employed to identify SNPs with high heterozygosity and low allele frequency variation.

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  • Initial screening involved African American, European American, and East Asian populations.
  • Further validation was conducted on seven diverse world populations, followed by a final screening of 40 populations (~2100 individuals).

    • Main Results:

    • A preliminary panel of 19 SNPs was selected from an initial 195 candidates.
    • The selected SNPs demonstrated average match probabilities below 10(-7) across most of the 40 studied populations.
    • Match probabilities did not exceed 10(-6) even in isolated, inbred populations.

    Conclusions:

    • The developed strategy effectively identifies informative SNPs with minimal population-specific allele frequency variation.
    • The preliminary SNP panel provides a strong foundation for reliable human identification in forensic science.
    • Expanding the panel to approximately 50 SNPs is projected to yield match probabilities around 10(-15) globally.