Cryptosporidium is more closely related to the gregarines than to coccidia as shown by phylogenetic analysis of apicomplexan parasites inferred using small-subunit ribosomal RNA gene sequences

The phylogenetic placement of gregarine parasites (Apicomplexa: Gregarinasina) within the Apicomplexa was derived by comparison of small-subunit ribosomal RNA gene sequences. Gregarine sequences were obtained from Gregarina niphandrodes Clopton, Percival, and Janovy, 1991, and Monocystis agilis Stei...

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Bibliographic Details
Published in:Parasitology research (1987) 1999-11, Vol.85 (11), p.899-904
Main Authors: CARRENO, R. A, MARTIN, D. S, BARTA, J. R
Format: Article
Language:English
Subjects:
Animals
Apicomplexa - genetics
Biological and medical sciences
Coccidia - genetics
Cryptosporidium - classification
Cryptosporidium - genetics
DNA, Protozoan - genetics
Fundamental and applied biological sciences. Psychology
Genes, rRNA - genetics
Likelihood Functions
Molecular Sequence Data
Phylogeny
Polymerase Chain Reaction - methods
Protozoa
Sequence Alignment
Sequence Analysis, DNA
Systematics. Geographical distribution. Morphology. Cytology
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Summary:The phylogenetic placement of gregarine parasites (Apicomplexa: Gregarinasina) within the Apicomplexa was derived by comparison of small-subunit ribosomal RNA gene sequences. Gregarine sequences were obtained from Gregarina niphandrodes Clopton, Percival, and Janovy, 1991, and Monocystis agilis Stein, 1848 (Eugregarinorida Léger 1900), as well as from Ophriocystis elektroscirrha McLaughlin and Myers, 1970 (Neogregarinorida Grassé 1953). The sequences were aligned with several other gregarine and apicomplexan sequences from GenBank and the resulting data matrix analyzed by parsimony and maximum-likelihood methods. The gregarines form a monophyletic clade that is a sister group to Cryptosporidium spp. The gregarine/ Cryptosporidium clade is separate from the other major apicomplexan clade containing the coccidia, adeleids, piroplasms, and haemosporinids. The trees indicate that the genus Cryptosporidium has a closer phylogenetic affinity with the gregarines than with the coccidia. These results do not support the present classification of the Cryptosporidiidae in the suborder Eimerioirina Léger, 1911.
ISSN:0932-0113
1432-1955
DOI:10.1007/s004360050655