Analysis of Short Tandem Repeat (STR) Polymorphisms by the PowerPlex 16 System and Capillary Electrophoresis: Application to Forensic Practice

Osamu Okamoto, Yuji Yamamoto, Sachiyo Inagaki, Kei Yoshitome, Takaki Ishikawa, Kiyomi Imabayashi, Satoru Miyaishi, Hideo Ishizu

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Allele and genotype frequencies for 15 short tandem repeat (STR) polymorphisms - D3S1358, TH01, D21S11, D18S51, Penta E, D5S818, D13S317, D7S820, D16S539, CSF1PO, Penta D, vWA, D8S1179, TPOX and FGA - in a Japanese population were estimated. No deviations of the observed allele frequency from Hardy-Weinberg equilibrium expectations were found for any of the systems studied. Between 2 new pentanucleotide STR loci, Penta E and Penta D, for which there is only limited data regarding the allelic distribution in Japanese, the Penta E locus was found to be highly polymorphic and exhibited a tri- or tetra-modal distribution pattern having allelic peaks with 5, 11, 15 and 20 repeats. The distribution was significantly different from that of the other ethnic groups. Statistical parameters of forensic importance, the power of discrimination (PD), observed and expected heterozygosity values (H), polymorphism information content (PIC), power of discrimination (PD), matching probability (pM), power of exclusion (PE), and typical paternity index (PI), were calculated for the loci. These parameters indicated the usefulness of the loci in forensic personal identification and paternity testing among Japanese. The systems Penta E, FGA, D18S51 and D8S1179 were the most informative. This method was successfully applied to forensic personal identification and paternity testing among Japanese, thereby confirming its efficacy for forensic practice.

Original languageEnglish
Pages (from-to)59-71
Number of pages13
JournalActa medica Okayama
Issue number2
Publication statusPublished - Apr 1 2003



  • DNA typing
  • Paternity testing
  • Personal identification
  • Population data
  • Short tandem repeats

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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