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

Published online by Cambridge University Press:  30 September 2010

K. L. HAAG ,
P. B. MARIN ,
D. A. S. GRAICHEN  and
M. L. DE LA RUE
K. L. HAAG*
Affiliation:
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 Departamento de Genética, Universidade Federal do Rio Grande do Sul. Caixa Postal 15053, CEP 91501-970, Porto Alegre, Brazil University of Basel, Zoological Institute, Vesalgasse 1, 4051 Basel, Switzerland
P. B. MARIN
Affiliation:
Departamento de Genética, Universidade Federal do Rio Grande do Sul. Caixa Postal 15053, CEP 91501-970, Porto Alegre, Brazil
D. A. S. GRAICHEN
Affiliation:
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
M. L. DE LA RUE
Affiliation:
Departamento de Microbiologia e Parasitologia/CCS, Universidade Federal de Santa Maria. Av. Roraima, 1000, CEP 97105-900, Santa Maria, Brazil
*
*Corresponding author: University of Basel, Zoological Institute, Vesalgasse 1, 4051 Basel, Switzerland. Tel: +41 (0) 61 267 03 61. Fax: +41 (0) 61 267 03 62. E-mail: karen.haag@unibas.ch
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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.

Keywords

selfingoutcrossingEchinococcus granulosusflatwormmating system
Type
Research Article
Information
Parasitology , Volume 138 , Issue 3 , March 2011 , pp. 298 - 302
Copyright
Copyright © Cambridge University Press 2010

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