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Polymorphic Insertions and Deletions in Parabasalian Enolase Genes

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Abstract

Insertions and deletions in gene sequences have been used as characters to infer phylogenetic relationships and, like any character, the information they contain varies in utility between different levels of evolution. In one case, the absence of two otherwise highly conserved deletions in the enolase genes of parabasalian protists has been interpreted as a primitive characteristic that suggests these were among the first eukaryotes. Here, semi-environmental 3′-RACE was used to sample enolases from parabasalia in the hindgut of the termite Zootermopsis angusticolis to examine the conservation of this character within the parabasalia. Parabasalian homologues were found to be polymorphic for these deletions, and the phylogeny of parabasalian enolases shows that the deletion-possessing genes branch within deletion-lacking genes (i.e., they did not form two clearly distinct groups). Phylogenetic incongruence was detected in the carboxy-terminal third of the sequence (in the region of the deletions), but there is no unambiguous evidence for recombination. The polymorphism of this character discredits these deletions as strong evidence for the early origin of parabasalia, although the complex distribution makes it impossible to state whether parabasalian enolases were ancestrally like those of other eukaryotes. These observations stress the importance of strong corroborating evidence when considering insertion and deletion data, and raises some interesting questions about the apparent variation in degree of conservation of these deletions between different eukaryotic groups.

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  1. Canadian Institute for Advanced Research, Department of Botany, University of British Columbia, 3529-6270 University Blvd., Vancouver, British Columbia V6T 1Z4, Canada

    Patrick J. Keeling

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Keeling, P.J. Polymorphic Insertions and Deletions in Parabasalian Enolase Genes . J Mol Evol 58, 550–556 (2004). https://doi.org/10.1007/s00239-003-2577-4

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  • DOI: https://doi.org/10.1007/s00239-003-2577-4

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