Journal article
Breeding systems in Echinococcus granulosus (Cestoda; Taeniidae): selfing or outcrossing?
Parasitology, Vol.118(1), pp.63-71
1999
Abstract
We used the PCR-SSCP method followed by sequencing in order to assess the genetic variability of coding and non-coding parts of the genome of Echinococcus granulosus (Cestoda; Taeniidae) and to test whether or not the parasite populations are mainly self-fertilizing. For this, we analysed a sample of 110 E. granulosus metacestode isolates collected from different geographical regions (Southern Brazil, Europe and Australia) and from different intermediate hosts (ovine, bovine, human, macropod, swine and equine). Using appropriate controls, we were able to identify 4 strains in that sample (sheep, cattle, pig and horse strains). The high degree of genetic differentiation between strains, but not within, and the monomorphism found in most loci (EgAg4, EgActII, EgHbx2 and EgAg6 - non-coding - EgAgB/1 and EgND1 - coding) indicated that they are largely selfed. On the other hand, outcrossing was also shown to occur, since 5 potential hybrid genotypes between cattle and sheep strains were found in populations of Southern Brazil, but absent in other geographical areas. We suggest that both processes are adaptive. The article also reports, for the first time, the occurrence of the E. granulosus cattle strain in South America.
Details
- Title
- Breeding systems in Echinococcus granulosus (Cestoda; Taeniidae): selfing or outcrossing?
- Authors/Creators
- K.L. Haag (Author/Creator) - Universidade Federal do Rio Grande do SulA.M. Araüjo (Author/Creator)B. Gottstein (Author/Creator) - University of BernM. Siles-Lucas (Author/Creator) - University of BernR.C.A. Thompson (Author/Creator) - Murdoch UniversityA. Zaha (Author/Creator) - Universidade Federal do Rio Grande do Sul
- Publication Details
- Parasitology, Vol.118(1), pp.63-71
- Publisher
- Cambridge University Press
- Identifiers
- 991005545035207891
- Murdoch Affiliation
- School of Veterinary and Biomedical Sciences
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.163 Parasitology - General
- 1.163.1106 Echinococcosis
- Web Of Science research areas
- Parasitology
- ESI research areas
- Microbiology