Correlation between genotypes of tRNA-linked short tandem repeats in Entamoeba nuttalli isolates and the geographical distribution of host rhesus macaques.

Abstract:

:Several polymorphic markers, including serine-rich protein genes, have been used for the genotyping of isolates from the morphologically indistinguishable protozoan parasites Entamoeba histolytica, Entamoeba dispar, and Entamoeba nuttalli. Genotypes of tRNA-linked short tandem repeats (STRs) are highly polymorphic, but the correlation with geographical distribution is unknown. We have recently isolated 15 E. nuttalli strains from wild rhesus macaques in four locations in Kathmandu Valley, Nepal. The sequences of the serine-rich protein genes of the E. nuttalli strains differed among the four locations. In this study, we analyzed tRNA-linked STRs in six loci of the 15 strains. Two genotypes were found in loci N-K2, R-R, and S(TGA)-D, three in locus S-Q, and five in locus D-A. In locus A-L, one major genotype and ten minor genotypes were found, resulting in mixtures of two to six genotypes in eight strains. By combination of the main genotypes in the six loci, the 15 strains were divided into nine genotypes. The genotypes observed in E. nuttalli strains were quite different from those in E. histolytica and E. dispar. A phylogenetic tree constructed from tRNA-linked STRs in the six loci reflected the different places of isolation. These results suggest that sequence diversity of tRNA-linked STRs in E. nuttalli occurs with relatively high frequency and might be a marker of geographical distribution of host rhesus macaques, even in limited areas.

journal_name

Parasitol Res

journal_title

Parasitology research

authors

Feng M,Komiyama T,Yanagi T,Cheng X,Sherchand JB,Tachibana H

doi

10.1007/s00436-013-3664-0

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

367-74

issue

1

eissn

0932-0113

issn

1432-1955

journal_volume

113

pub_type

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