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Microsporidian infection in a free-living marine nematode

A M Ardila-Garcia1, N M Fast

  • 1Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.

Eukaryotic Cell
|October 23, 2012
PubMed

Insights

A novel microsporidian species, Sporanauta perivermis, infects marine nematodes in hypodermal and muscle tissues, unlike the previously known "nematode killer." This discovery reveals a more diverse range of microsporidian infections in the wild.

Area of Science:

  • Mycology
  • Parasitology
  • Marine Biology

Background:

  • Microsporidia are unicellular obligate endoparasites.
  • Nematocida parisii is the only previously confirmed microsporidian infection in nematodes, causing lethal intestinal infections.
  • The infection pattern of N. parisii in laboratory settings may not represent all microsporidian-nematode interactions.

Purpose of the Study:

  • To characterize a microsporidian infection in a wild nematode.
  • To determine if N. parisii's infection pattern is typical for microsporidia in nematodes.
  • To describe a novel microsporidian species and its infection in its natural host.

Main Methods:

  • Transmission electron microscopy (TEM) for tissue localization.
  • Fluorescent in situ hybridization (FISH) to confirm parasite presence and location.
  • Isolation and characterization of a novel microsporidian species.

Main Results:

  • A new microsporidian species, Sporanauta perivermis, was identified in the marine nematode Odontophora rectangula.
  • S. perivermis infection was localized to hypodermal and muscle tissues, distinct from intestinal infections.
  • FISH revealed S. perivermis also infects O. rectangula eggs, suggesting vertical transmission.

Conclusions:

  • Microsporidian infections in wild nematodes are more diverse than previously thought.
  • Sporanauta perivermis exhibits a unique infection strategy, differing significantly from Nematocida parisii.
  • Studying parasites in natural hosts is crucial for understanding the full spectrum of host-parasite interactions and disease dynamics.

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