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Pubmed ID :22575172
Publication Date : //

Identification of Fasciola flukes in Thailand based on their spermatogenesis and nuclear ribosomal DNA, and their intraspecific relationships based on mitochondrial DNA.


We analyzed 147 Fasciola flukes obtained from cattle in Thailand based on their spermatogenetic ability, and nuclear ribosomal internal transcribed spacer 1 (ITS1) and mitochondrial nicotiamide adenine dinucleotide dehydrogenase subunit 1 (ND1) genes as molecular markers. One hundred twenty-eight flukes, which had abundant sperm in their seminal vesicles (spermic) and showed the PCR-RFLP pattern of F. gigantica in the ITS1, were accurately identified as F. gigantica. The other 19 flukes that had no sperm in their seminal vesicles were aspermic Fasciola sp. with the RFLP patterns identical to that of F. gigantica. Twenty-nine ND1 haplotypes (Fg-ND1-Thai 2-30) were distinguished in the 128 F. gigantica flukes and were divided into haplotypes unique to Thailand and those common to other countries, suggesting the possibility that ancestral haplotypes were introduced into Thailand. Three haplotypes (Fg-ND1-Thai 7, 9 and 27) appeared to be the major haplotypes found in F. gigantica from Thailand. Only one haplotype (Fg-ND1-Thai 1) was found in the 19 aspermic Fasciola sp. flukes obtained from geographical regions, and the nucleotide sequence of Fg-ND1-Thai 1 was identical to that of the aspermic Fasciola sp. from Japan, Korea, China, Vietnam and Myanmar, suggesting that they were descendants with a common provenance and expanded to these countries in the relatively recent past.

Authors : Chaichanasak Pannigan , Ichikawa Madoka , Sobhon Prasert , Itagaki Tadashi ,

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