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The relationship of Hammondia hammondi and Sarcocystis mucosa to other heteroxenous cyst-forming coccidia as inferred by phylogenetic analysis of the 18S SSU ribosomal DNA sequence

Published online by Cambridge University Press:  01 August 1999

M. C. JENKINS ,
J. T. ELLIS ,
S. LIDDELL ,
C. RYCE ,
B. L. MUNDAY ,
D. A. MORRISON  and
J. P. DUBEY
M. C. JENKINS
Affiliation:
Parasite Biology and Epidemiology Laboratory, Agricultural Research Service, USDA, BARC-EAST, Building 1040, Beltsville, MD 20705, USA
J. T. ELLIS
Affiliation:
Molecular Parasitology Unit, Department of Cell and Molecular Biology, University of Technology, Sydney, Westbourne Street, Gore Hill, NSW 2065, Australia
S. LIDDELL
Affiliation:
Parasite Biology and Epidemiology Laboratory, Agricultural Research Service, USDA, BARC-EAST, Building 1040, Beltsville, MD 20705, USA
C. RYCE
Affiliation:
Molecular Parasitology Unit, Department of Cell and Molecular Biology, University of Technology, Sydney, Westbourne Street, Gore Hill, NSW 2065, Australia
B. L. MUNDAY
Affiliation:
Department of Aquaculture, University of Tasmania at Launceston, PO Box 1214, Launceston, Tasmania 7250, Australia
D. A. MORRISON
Affiliation:
Molecular Parasitology Unit, Department of Cell and Molecular Biology, University of Technology, Sydney, Westbourne Street, Gore Hill, NSW 2065, Australia
J. P. DUBEY
Affiliation:
Parasite Biology and Epidemiology Laboratory, Agricultural Research Service, USDA, BARC-EAST, Building 1040, Beltsville, MD 20705, USA
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Abstract

The complete sequence of the 18S small subunit (SSU) ribosomal DNA of Hammondia hammondi and Sarcocystis mucosa was obtained and compared to SSU rDNA sequences of Neospora caninum, Toxoplasma gondii, Besnoitia besnoiti, 2 species of Frenkelia, 3 species of Isospora, and 13 species of Sarcocystis. Analyses showed that H. hammondi and T. gondii are monophyletic and that these taxa shared a common ancestor with N. caninum and B. besnoiti. The weight of evidence shows that S. mucosa, S. neurona, and Frenkelia species form a clade thereby supporting the conclusion that Sarcocystis is paraphyletic.

Keywords

HammondiaApicomplexaphylogenetic analysis
Type
Research Article
Information
Parasitology , Volume 119 , Issue 2 , August 1999 , pp. 135 - 142
Copyright
1999 Cambridge University Press

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