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Phenotypic variation in a significant spore character in Kudoa (Myxosporea: Multivalvulida) species infecting brain

Mieke A A Burger1, Robert D Adlard

  • 1School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia.

Parasitology
|June 16, 2010
PubMed

Insights

Kudoa species exhibit spore variations, complicating diagnosis. Molecular and morphometric analyses confirm conspecificity despite differing polar capsule counts, impacting pathogenic species identification.

Area of Science:

  • Marine biology
  • Parasitology
  • Molecular biology

Background:

  • Kudoa species, myxozoan parasites, are diagnosed by spore morphology, particularly polar capsule number.
  • Variations in polar capsule number within Kudoa species can hinder accurate diagnosis.
  • Previous studies noted genetic identity between morphologically distinct Kudoa isolates, raising questions about SSU rDNA resolution and conspecificity.

Purpose of the Study:

  • To investigate the relationship between spore morphotypes and kudoid isolates.
  • To determine if molecular data indicates conspecificity or if SSU rDNA has reached its resolution limit.
  • To assess the impact of phenotypic variation on the diagnosis of Kudoa species.

Main Methods:

  • Sequencing of small subunit (SSU) and large subunit (LSU) ribosomal DNA (rDNA).
  • Principal components, correlation, and regression analyses of morphometric data.
  • Comparison of molecular data with spore morphotypes from different kudoid isolates infecting brain tissue.

Main Results:

  • Molecular analyses (SSU and LSU rDNA) indicated conspecificity between Kudoa isolates with differing spore morphotypes.
  • Morphometric trends were consistent within isolates, supporting molecular findings.
  • Phenotypic variation in spore characteristics significantly impacts the diagnosis of Kudoa species.

Conclusions:

  • Molecular data strongly supports conspecificity in Kudoa species despite variations in polar capsule number.
  • Morphological variations are influenced by phenotypic factors, not distinct species.
  • Accurate diagnosis of Kudoa and related pathogenic species requires integrating molecular and morphometric data.

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