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Strain differentiation in microsporidia
H Rinder1, S Katzwinkel-Wladarsch, A Thomschke
1Department of Infectious Diseases and Tropical Medicine, Klinikum Innenstadt, University of Munich, Germany.
The Tokai Journal of Experimental and Clinical Medicine
|January 6, 2000
Summary
Microsporidia are emerging pathogens causing chronic diarrhea. Differentiating strains is key to understanding transmission, but current genetic markers are limited for species like Encephalitozoon.
Area of Science:
- Medical Microbiology
- Parasitology
- Molecular Biology
Background:
- Microsporidia are emerging intracellular pathogens causing opportunistic infections, particularly chronic diarrhea in immunocompromised individuals.
- Enterocytozoon spp. and Encephalitozoon spp. are significant etiological agents requiring strain differentiation for reservoir and transmission studies.
- Current knowledge of microsporidial strain diversity is limited, especially for Encephalitozoon intestinalis and E. hellem.
Purpose of the Study:
- To highlight the necessity of strain differentiation within microsporidia species.
- To review the current understanding of genetic variability in key human-pathogenic microsporidia.
- To identify gaps in knowledge regarding strain characterization for transmission and reservoir elucidation.
Main Methods:
- Review of existing literature on microsporidial genetics and epidemiology.
- Analysis of known genetic markers, specifically the internal transcribed spacer (ITS) region of rRNA gene.
- Identification of polymorphic sites and repeat variations within different microsporidial species.
Main Results:
- Enterocytozoon bieneusi exhibits significant genetic diversity with 6 known genotypes and 12 polymorphic sites in its ITS region.
- Encephalitozoon cuniculi shows limited ITS variability, with only one polymorphic site characterized by tetranucleotide repeat variations.
- Limited data exists on strain differentiation for Encephalitozoon intestinalis and E. hellem.
Conclusions:
- Strain differentiation of microsporidia is crucial for understanding their epidemiology and public health impact.
- Existing genetic markers, particularly ITS, offer some discriminatory power but may be insufficient for certain species.
- Further genomic target characterization is necessary to fully elucidate the reservoirs and transmission routes of emerging microsporidial pathogens.