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Reappraising the theme of breeding systems in Echinococcus: is outcrossing a rare phenomenon?

HAAG, K. L. ; MARIN, P. B. ; GRAICHEN, D. A. S. ; DE LA RUE, M. L.

In: Parasitology, 2011, vol. 138, no. 3, p. 298-302

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    Titre
    • Reappraising the theme of breeding systems in Echinococcus: is outcrossing a rare phenomenon?
    Auteur
    • HAAG, K. L.. Programa de Pós Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul. Caixa Postal 15053, CEP 91501-970, Porto Alegre, Brazil
    • MARIN, P. B.. Departamento de Genética, Universidade Federal do Rio Grande do Sul. Caixa Postal 15053, CEP 91501-970, Porto Alegre, Brazil
    • GRAICHEN, D. A. S.. Programa de Pós Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul. Caixa Postal 15053, CEP 91501-970, Porto Alegre, Brazil
    • DE LA RUE, M. L.. Departamento de Microbiologia e Parasitologia/CCS, Universidade Federal de Santa Maria. Av. Roraima, 1000, CEP 97105-900, Santa Maria, Brazil
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:301477
    Summary
    Selfing has been considered the most common mode of reproduction in Echinococcus flatworms. However, population genetic studies on the asexual larval stage involving nuclear co-dominant markers have not always revealed significant heterozygote deficiencies - the expected outcome of a regularly and highly inbred population. In this study, we analysed the genetic structure of Echinococcus granulosus sensu lato populations from Southern Brazil during their adult (sexual) stage using 1 mitochondrial and 1 nuclear marker (cox 1 and mdh, respectively). We show that parasite genetic differentiation is largest among definitive hosts (domestic dogs) from different farms, suggesting that transmission is mostly maintained within a farm. Moreover, we show that heterozygote deficiencies are not significant, and we suggest that outbreeding is the most common mode of reproduction of the parasite in that region