Microheterogeneity and coevolution



Title Microheterogeneity and coevolution: an examination of rDNA sequence characteristics in Neoparamoeba pemaquidensis and its prokinetoplastid endosymbiont
Author(s) Charles G. B. Caraguel , Charles J. O'Kelly , Pierre Legendre , Salvatore Frasca , Rebecca J. Gast, Beatrice M. Despres , Richard J. Cawthorn, Spencer J. Greenwood
Journal The Journal of Eukaryotic Microbiology
Date 2007
Volume 54
Issue 5
Start page 418
End page 426
Abstract ABSTRACT. Neoparamoeba pemaquidensis, the etiological agent of amoebic gill disease, has shown surprising sequence variability among different copies of the 18S ribosomal RNA gene within an isolate. This intra-genomic microheterogeneity was confirmed and extended to an analysis of the internal transcribed spacer (ITS) region. High levels of intra-genomic nucleotide diversity (Pi=0.0201-0.0313) were found among sequenced ITS regions from individual host amoeba isolates. In contrast, the ITS region of its endosymbiont revealed significantly lower levels of intra-genomic nucleotide diversity (Pi=0.0028-0.0056) compared with the host N. pemaquidensis. Phylogenetic and ParaFit coevolution analyses involving N. pemaquidensis isolates and their respective endosymbionts confirmed a significant coevolutionary relationship between the two protists. The observation of non-shared microheterogeneity and coevolution emphasizes the complexity of the interactions between N. pemaquidensis and its obligate endosymbiont.
DOI 10.1111/j.1550-7408.2007.00281.x
PubMed ID 17910686

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