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Correspondence| Volume 25, e12-e13, November 2016

Typing concordance between PowerPlex® Fusion and GlobalFiler® based on 1501 Japanese individuals and the causes of typing discrepancies

  • Koji Fujii
    Correspondence
    Corresponding author at: First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan

    Identification Center, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Haruhiko Watahiki
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Yusuke Mita
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Yasuki Iwashima
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan

    Forensic Science Laboratory, Kyoto Prefectural Police HQ, 85-3, 85-4, Shimodachiuri-dori, Kamanza-higashiiru, Yabunouchi-cho, Kamigyo-ku, Kyoto 602-8550, Japan
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  • Tetsushi Kitayama
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan

    Identification Center, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Hiroaki Nakahara
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Natsuko Mizuno
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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  • Kazumasa Sekiguchi
    Affiliations
    First Department of Forensic Science, National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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      Typing discrepancies have been reported in concordance studies in which population samples were genotyped using different short tandem repeat (STR) kits [
      • Budowle B.
      • Masibay A.
      • Anderson S.J.
      • Barna C.
      • Biega L.
      • Brenneke S.
      • et al.
      STR primer concordance study.
      ,
      • Budowle B.
      • Sprecher C.J.
      Concordance study on population database samples using the PowerPlex™ 16 kit and AmpFℓSTR® Profiler Plus™ kit and AmpFℓSTR® COfiler™ kit.
      ,
      • Hill C.R.
      • Kline M.C.
      • Mulero J.J.
      • Lagacé R.E.
      • Chang C.-W.
      • Hennessy L.K.
      • et al.
      Concordance study between the AmpFℓSTR® MiniFiler™ PCR amplification kit and conventional STR typing kits.
      ,
      • Hill C.R.
      • Duewer D.L.
      • Kline M.C.
      • Sprecher C.J.
      • McLaren R.S.
      • Rabbach D.R.
      • et al.
      Concordance and population studies along with stutter and peak height ratio analysis for the PowerPlex® ESX 17 and ESI 17 systems.
      ,
      • Welch L.A.
      • Gill P.
      • Phillips C.
      • Ansell R.
      • Morling N.
      • Parson W.
      • et al.
      European network of forensic science institutes (ENFSI): evaluation of new commercial STR multiplexes that include the european standard set (ESS) of markers.
      ,
      • Westen A.A.
      • Kraaijenbrink T.
      • Robles de Medina E.A.
      • Harteveld J.
      • Willemse P.
      • Zuniga S.B.
      • et al.
      Comparing six commercial autosomal STR kits in a large Dutch population sample.
      ,
      • Park H.-C.
      • Kim K.
      • Nam Y.
      • Park J.
      • Lee J.
      • Lee H.
      • et al.
      Population genetic study for 24 STR loci and Y indel (GlobalFiler™ PCR amplification kit and PowerPlex® Fusion system) in 1000 Korean individuals.
      ]. However, as far as we know, no comprehensive concordance studies have examined typing results for the Japanese population. Previously, we genotyped 1501 Japanese samples using PowerPlex® Fusion [
      • Fujii K.
      • Iwashima Y.
      • Kitayama T.
      • Nakahara H.
      • Mizuno N.
      • Sekiguchi K.
      Allele frequencies for 22 autosomal short tandem repeat loci obtained by PowerPlex Fusion in a sample of 1501 individuals from the Japanese population.
      ] and GlobalFiler® [
      • Fujii K.
      • Watahiki H.
      • Mita Y.
      • Iwashima Y.
      • Kitayama T.
      • Nakahara H.
      • et al.
      Allele frequencies for 21 autosomal short tandem repeat loci obtained using GlobalFiler in a sample of 1501 individuals from the Japanese population.
      ]. Of the 1501 samples, one heterozygous sample showed a discrepancy at the D5S818 locus (designated 9.3, 12 using PowerPlex® Fusion, but 10, 12 using GlobalFiler®), which was attributed to a single nucleotide deletion in the primer biding site [
      • Fujii K.
      • Iwashima Y.
      • Watahiki H.
      • Mita Y.
      • Kitayama T.
      • Nakahara H.
      • et al.
      D5S818 typing discrepancy between PowerPlex® Fusion and other STR kits including GlobalFiler® caused by a one-base deletion in 31 nucleotides upstream of the repeat region.
      ]. Herein, we examined the typing concordance between the two STR kits and confirmed the presence of silent alleles in the additional discordant samples by a sequencing analysis. In addition, for the D2S441 and D22S1045 loci, the positions of the 5′ ends of the GlobalFiler® forward primers were also estimated using our method [
      • Mizuno N.
      • Inokuchi S.
      • Kitayama T.
      • Fujii K.
      • Kasai K.
      • Sekiguchi K.
      A method to determine the 5′ end of the binding site of primers included in a commercially available forensic human identification kit.
      ] in order to examine the causes of the discordant results.
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