Genetic characterisation by isoenzyme markers of North American and Australasian isolates of species of Sarcocystis (Protozoa: Apicomplexa) from mice,sheep, goats and cattle |
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| Authors: | G E Ford R Fayer M Adams P J O'Donoghue J P Dubey P R Baverstock |
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| Institution: | (1) S.A. Central Veterinary Laboratories, Department of Agriculture, c/o Institute of Medical and Veterinary Science, Frome Road, 5000 Adelaide, SA, Australia;(2) Department of Agriculture, Agricultural Research Service, Animal Parasitology Institute, 20705 Beltsville, MD, USA;(3) Evolutionary Biology Unit, South Australian Museum, North Terrace, 5000 Adelaide, SA, Australia |
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| Abstract: | The technique of isoenzyme (enzyme isotype) electrophoresis was used to compare genetic profiles of extracts of zoites of
sarcocysts from North America and Australasia. The species examined were Sarcocystis muris (Railliet, 1886) from mice, S. gigantea (Railliet, 1886) (syn. S. ovifelis Heydorn et al., 1975) from sheep, S. capracanis Fischer, 1979 from goats and S. cruzi (Hasselmann, 1923) (syn. S. bovicanis Heydorn et al., 1975) from cattle. Sarcocysts from the four host animals had different alleles at almost all loci studied. This was not
affected by having a common definitive host. Extracts of two cat-borne Sarcocystis species shared alleles at only 3 out of 16 loci, while two dog-borne Sarcocystis species had different alleles at 8 out of 16 loci. The extent of genetic divergence among sarcocysts confirmed the existance
of distinct species in each host sampled. By contrast, the isolates from the United States of America and Australasia for
any particular host were essentially identical, sharing at least one allele at every locus tested. ac]19860908 |
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