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[Comparative study of different strains of the dwarf tapeworm, Hymenolepis nana in the process of adapting to the body of a new host, the white mouse].

Different strains of H. nana from man, Norway and white rats were studied in regards to their adaptability. Strains obtained from spontaneously infected white mice and those passaged for several years on white mice served as control. In the course of successive passages the infectivity of these strains, developmental rates of tissue larvae, localization of cystocercoids in the small intestine and mesenteric lymph glands were compared. The strains were found to possess different adaptability to white mice. The strain from white rats had the highest rate of adaptation, the strains from Norway rats and man showed lower adaptation rates, respectively.

Adaptation, Physiological↗
PubMed2003

Isolation and characterization of microsatellites from the tapeworm Echinococcus granulosus.

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.

Animals↗