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Genetic characterization of parthenogenic <i>Fasciola</i> sp. in Japan on the basis of the sequences of ribosomal and mitochondrial DNA
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Description
<jats:p>Accurate identification of aspermic <jats:italic>Fasciola</jats:italic> forms in Japan remains difficult because of their morphological variations. In order to characterize the forms genetically, nucleotide sequences of ribosomal internal transcribed spacer (ITS1 and ITS2) and mitochondrial cytochrome c oxidase I (COI) and NADH dehydrogenase I (NDI) genes in 34 liver flukes from 16 prefectures in Japan were analysed. Two major forms represented by Fsp 1 and Fsp 2 had sequences identical to or closely resembling those of <jats:italic>F. hepatica</jats:italic> and <jats:italic>F. gigantica</jats:italic>, respectively, in all the 4 DNA markers and were mainly distributed in northern and eastern-western parts of Japan, respectively. Fsp 1 and Fsp 2 would have been introduced into Japan with infected cattle of 2 distinct lineages via the Korean Peninsula and spread through limited parts of Japan (northern and eastern-western parts) together with the movement of each cattle lineage. The Japanese form (Fsp 1/2), which showed heterozygosity in ribosomal DNA and Fsp 2 haplotype in mitochondrial DNA, may have originated in interspecific cross hybridization between paternal <jats:italic>F. hepatica</jats:italic> and maternal <jats:italic>F. gigantica</jats:italic>.</jats:p>
Journal
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- Parasitology
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Parasitology 131 (5), 679-685, 2005-07-11
Cambridge University Press (CUP)