Journal article

A comparison of the first internal transcribed spacer of ribosomal DNA in seven species of Trichostrongylus (Nematoda : Trichostrongylidae)

H Hoste, NB Chilton, I Beveridge, RB Gasser

INTERNATIONAL JOURNAL FOR PARASITOLOGY | PERGAMON-ELSEVIER SCIENCE LTD | Published : 1998

Abstract

The first internal transcribed spacer (ITS-1) of the ribosomal DNA of seven species of Trichostrongylus was sequenced. The length of ITS-1 in the different species varied from 387 to 390 bases. The G + C content of the ITS-1 sequences were approximately 42%. Little or no intraspecific variation was detected in the three species. Trichostrongylus axei, Trichostrongylus colubriformis and Trichostrongylus vitrinus, for which multiple isolates from different geographical regions were sequenced. In contrast, the level of ITS-1 sequence differences between species ranged from 1.3% to 5.7%. The greatest sequence differences were detected between T. tenuis, the parasite species which infects birds a..

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