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Isolation and characterization of microsatellites from the tapeworm Echinococcus granulosus

Published online by Cambridge University Press:  14 August 2003

M. L. BARTHOLOMEI-SANTOS ,
L. S. HEINZELMANN ,
R. P. OLIVEIRA ,
G. CHEMALE ,
A. M. GUTIERREZ ,
L. KAMENETZKY ,
K. L. HAAG  and
A. ZAHA
M. L. BARTHOLOMEI-SANTOS
Affiliation:
Centro de Biotecnologia e Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15.005, Porto Alegre 91.501-970, RS, Brazil Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97.105-900, RS, Brazil
L. S. HEINZELMANN
Affiliation:
Centro de Biotecnologia e Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15.005, Porto Alegre 91.501-970, RS, Brazil
R. P. OLIVEIRA
Affiliation:
Departamento de Ciências Biológicas, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Ouro Preto 34.500-000, MG, Brazil
G. CHEMALE
Affiliation:
Centro de Biotecnologia e Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15.005, Porto Alegre 91.501-970, RS, Brazil
A. M. GUTIERREZ
Affiliation:
Departamento de Parasitologia, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud ‘Dr. Carlos G. Malbrán’, Vélez Sarsfield 563, 1281 Buenos Aires, Argentina
L. KAMENETZKY
Affiliation:
Departamento de Parasitologia, Instituto Nacional de Enfermedades Infecciosas, Administración Nacional de Laboratorios e Institutos de Salud ‘Dr. Carlos G. Malbrán’, Vélez Sarsfield 563, 1281 Buenos Aires, Argentina
K. L. HAAG
Affiliation:
Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15.053, Porto Alegre 91.501-970, RS, Brazil
A. ZAHA
Affiliation:
Centro de Biotecnologia e Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15.005, Porto Alegre 91.501-970, RS, Brazil
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Abstract

The Echinococcus granulosus genome was searched for microsatellites using 8 different repeated oligonucleotides as probes (GT15, CT15, AT15, CG15, CAT10, CAA10, CGG10 and CATA10). Southern blot experiments revealed that DNA regions containing GT, CAA, CATA and CT repeats are the most frequent in the E. granulosus genome. AT and CG probes showed no hybridization signal. Two loci containing CA/GT (Egmsca1 and Egmsca2) and 1 locus containing GA/CT (Egmsga1) repeats were cloned and sequenced. The locus Egmsca1 was analysed in 73 isolates from Brazil and Argentina whose strains were previously characterized. Brazilian isolates from cattle strain and Argentinean isolates from camel strain were monomorphic and shared the allele (CA)7. Argentinean isolates of sheep and Tasmanian sheep strains shared 2 alleles [(CA)8 and (CA)10] with Brazilian isolates of sheep strain. The allele (CA)11 was found only in Brazilian isolates of sheep strain at a low frequency. The Brazilian and the Argentinean sheep strain populations were tested for the Hardy-Weinberg equilibrium, and only the former was in agreement with the expectations. No polymorphism was found among individual protoscoleces from a single hydatid cyst, validating the utilization of pooled protoscoleces from 1 cyst, grouped as an isolate, in population studies. This work describes for the first time the isolation and characterization of microsatellites from E. granulosus.

Keywords

Echinococcus granulosusCestodamicrosatellite markers
Type
Research Article
Information
Parasitology , Volume 126 , Issue 6 , June 2003 , pp. 599 - 605
Copyright
© 2003 Cambridge University Press

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