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Molecular genetic characterization of the cervid strain (‘northern form’) of Echinococcus granulosus

Published online by Cambridge University Press:  06 April 2009

J. Bowles ,
D. Blair  and
D. P. McManus
J. Bowles
Affiliation:
Molecular Parasitology Unit, Tropical Health Program, Queensland Institute of Medical Research, The Bancroft Centre, 300 Herston Road, Brisbane, Queensland 4029, Australia
D. Blair
Affiliation:
Department of Zoology, James Cook University, Townsville, Queensland 4811, Australia
D. P. McManus
Affiliation:
Molecular Parasitology Unit, Tropical Health Program, Queensland Institute of Medical Research, The Bancroft Centre, 300 Herston Road, Brisbane, Queensland 4029, Australia
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Summary

We have used a number of molecular genetic approaches to characterize the cervid strain (‘northern form’) of Echinococcus granulosus. PCR–RFLP analysis of the nuclear ITS1 region of the rDNA repeat can readily distinguish the cervid form from other strains of E. granulosus. The complexity of the RFLP patterns obtained suggests that a number of distinct ITS1 types are present in this strain which may represent an inter-strain E. granulosus hybrid. Mitochondrial CO1 sequence of the cervid genotype was ambiguous at 18 positions and closely resembles a cluster of previously characterized E. granulosus genotypes, G1 (common, domestic sheep)/G2 (Tasmanian sheep)/G3 (buffalo). In contrast, mitochondrial ND1 sequence, although unique, suggests that the cervid form is most similar to strains represented by the G6 (camel)/G7 (pig) genotypes. We assume that the CO1 and ND1 sequences obtained for the cervid genotype are linked in a single mitochondrial genome although this is difficult to explain if conventional molecular genetics of mitochondrial DNA are assumed. Based on its unique ND1 sequence and ITS1 PCR–RFLP pattern, the cervid strain appears to represent a distinct genotype (designated G8) of E. granulosus.

Keywords

EchinococcusEchinococcus granulosusgenotypesstrainscervid straincytochrome c oxidase I (COI) gene, NADH dehydrogenase I (NDI) genePCR–RFLP analysisnuclear rDNA ITS1 region
Type
Research Article
Information
Parasitology , Volume 109 , Issue 2 , August 1994 , pp. 215 - 221
Copyright
Copyright © Cambridge University Press 1994

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