Phylogenetic status of a lung fluke in the Philippines based on mitochondrial genome

  • SATO YUKITA
    Laboratory of Biomedical Science, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University
  • IWAGAMI MORITOSHI
    Department of Environmental Health Science, Kochi Medical School
  • IWASHITA JUN
    Laboratory of Molecular Biology, Akita Prefectural University
  • ABE TATSUYA
    Laboratory of Molecular Biology, Akita Prefectural University
  • YUKAWA MASAYOSHI
    Laboratory of Biomedical Science, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University
  • BLAS BAYANI L.
    Schistosomiasis Research and Training Center
  • KAWASHIMA KENJIRO
    School of Health Sciences, Kyusyu University
  • AGATSUMA TAKESHI
    Department of Environmental Health Science, Kochi Medical School

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Based on a near-complete mitochondrial DNA sequence, the phylogenetic status of a lung fluke collected in the Philippines was evaluated. The lung fluke from Leyte Island, Philippines, resembles Paragonimus westermani morphologically and is sometimes regarded as a subspecies, P westermani filipinus. In this study, all mitochondrial genes of the Leyte form were sequenced : 12 subunits of mitochondrial enzymes, 2 ribosomal RNA genes and 21 transfer RNAs. The gene order is the same as that of the previously-published P. westermani from Korea. All genes are transcribed in the same direction. The sequence from Leyte was 88.8% identical to the previously-published sequence (accession No. AF219379). This is further evidence that the Philippine form should be regarded as specifically distinct from the form in East Asia (China, Japan and Korea). This conclusion is strengthened by the observation that the molluscan host of the Philippine form is of a different family from that of the East Asian form.

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