Forensic Science International
Volume 115, Issue 3 , Pages 207-217, 15 January 2001

Sequenced allelic ladders and population genetics of a new STR multiplex system

  • Stephanie Watson

      Affiliations

    • The Forensic Science Service, Priory House, Gooch Street North, Birmingham B5 6QQ, UK
    • Corresponding Author InformationCorresponding author. Tel.: +44-121-617-6917; fax: +44-121-666-6125
    • ,
  • Rachel Allsop

      Affiliations

    • The Forensic Science Service, Priory House, Gooch Street North, Birmingham B5 6QQ, UK
    • ,
  • Lindsey Foreman

      Affiliations

    • The Forensic Science Service, 109 Lambeth Road London, London SE1 7LP, UK
    • ,
  • Zoe Kelsey

      Affiliations

    • The Forensic Science Service, Priory House, Gooch Street North, Birmingham B5 6QQ, UK
    • ,
  • Peter Gill

      Affiliations

    • The Forensic Science Service, Priory House, Gooch Street North, Birmingham B5 6QQ, UK

Received 12 December 1999; received in revised form 11 June 2000; accepted 14 June 2000.

Abstract 

The advent of PCR technology and use of short tandem repeat (STR) loci improves throughput and reduces costs whilst a high level of discrimination can be achieved. A new system, comprising seven STRs, was developed to compliment the existing systems. This paper describes the preparation of allelic ladders of the most commonly observed alleles of a new STR multiplex system (third generation; TGM multiplex); all alleles have been sequenced. Meioses studies estimated a mutation rate of 0–0.4% across loci. Statistical independence was investigated by employing exact tests; χ2-tests and excess homozygosity tests. The results demonstrated that the allele proportions do not differ from those expected and that there was no consequential dependence between loci. The discriminating power of the system was examined using 295 Caucasian, 140 Afro-Caribbean and 212 Asian unrelated samples, and was found to be approximately 1 in 50 million, 1 in 85 million and 1 in 20 million for each of these groups, respectively.

Keywords:  Multiplex, STR, Casework, TGM, SGM

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PII: S0379-0738(00)00331-5

Forensic Science International
Volume 115, Issue 3 , Pages 207-217, 15 January 2001

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