Korean J Parasitol.  2003 Dec;41(4):181-188. 10.3347/kjp.2003.41.4.181.

Acanthamoeba sohi, n. sp., a pathogenic Korean isolate YM-4 from a freshwater fish

• Im KI
• Shin HJ

• KMID: 662757
• DOI: http://doi.org/10.3347/kjp.2003.41.4.181

Abstract

A new species of Acanthamoeba was isolated from a freshwater fish in Korea and tentatively named Acanthamoeba sp. YM-4 (Korean isolate YM-4). The trophozoites were 11.0-23.0 micrometer in length and had hyaline filamentous projections. Cysts were similar to those of A. culbertsoni and A. royreba, which were previously designated as Acanthamoeba group III. Acanthamoeba YM-4 can survive at 40 degrees C, and its generation time was 19.6 hr, which was longer than that of A. culbertsoni. In terms of the in vitro cytotoxicity of lysates, Acanthamoeba YM-4 was weaker than A. culbertsoni, but stronger than A. polyphaga. On the basis of the mortality of experimentally infected mice, Acanthamoeba YM-4 was found to be highly virulent. The isoenzymes profile of Acanthamoeba YM-4 was similar to that of A. royreba. An anti-Acanthamoeba YM-4 monoclonal antibody, McAY7, was found to react only with Acanthamoeba YM-4, and not with A. culbertsoni. Random amplified polymorphic DNA marker analysis and RFLP analysis of mitochondrial DNA and of 18S small subunit ribosomal RNA, placed Acanthamoeba YM-4 in a separate cluster on the basis of phylogenetic distances. Thus the Acanthamoeba Korean isolate YM-4 was identified as a new species, and assigned as Acanthamoeba sohi.

Keyword

Acanthamoeba; pathogenicity; restriction fragment length polymorphism; phylogeny

MeSH Terms

Acanthamoeba/*classification/genetics/isolation & purification/*pathogenicity
Amebiasis/parasitology/*veterinary
Animals
DNA, Mitochondrial/analysis
DNA, Protozoan/analysis
Fish Diseases/*parasitology
Gills/parasitology
Goldfish/*parasitology
Korea
Mice
Phylogeny
Polymorphism, Restriction Fragment Length
RNA, Ribosomal, 18S/genetics
Random Amplified Polymorphic DNA Technique
Virulence