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Karyotype instability in Cryptococcus neoformans infection

B C Fries1, F Chen, B P Currie

  • 1Department of Medicine, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

Journal of Clinical Microbiology
|June 1, 1996
PubMed
Summary
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Cryptococcus neoformans exhibits significant genetic diversity, with karyotype changes occurring during chronic infections and experimental mouse models. This highlights the adaptability of this fungal pathogen.

Area of Science:

  • Medical Mycology
  • Microbial Genetics
  • Pathogen Evolution

Background:

  • Cryptococcus neoformans is an opportunistic fungal pathogen causing cryptococcosis.
  • Understanding the genetic variability of C. neoformans is crucial for disease management.
  • Electrophoretic karyotyping is a method to analyze chromosomal DNA patterns.

Purpose of the Study:

  • To investigate the electrophoretic karyotypes of clinical and environmental Cryptococcus neoformans isolates.
  • To assess karyotype stability in sequential isolates from patients and during experimental infections.
  • To determine the extent of karyotype variation within a specific geographic region.

Main Methods:

  • Contour-clamped homogeneous electrophoresis was used to analyze the karyotypes of 32 clinical and 3 environmental C. neoformans isolates.

Related Experiment Videos

  • Sequential isolates from patients with chronic or relapsing infections were compared.
  • Isolates were passaged through a mouse model to evaluate karyotype changes in vivo.

    • Main Results:

    • Extensive variation in electrophoretic karyotypes was observed among isolates from different patients.
    • Sequential isolates from 50% of patients showed minor karyotype differences, suggesting in vivo chromosomal alterations.
    • Karyotype differences were detected in one clinical and two environmental strains after experimental mouse passage.

    Conclusions:

    • Cryptococcus neoformans displays significant karyotype variation even within a limited geographic area.
    • Karyotype instability is frequent in sequential isolates from individual patients.
    • Experimental infection in mice induces electrophoretic karyotype changes, indicating pathogen adaptability.