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Microsatellite (STRAf) genotyping cannot differentiate between invasive and colonizing Aspergillus fumigatus isolates
Pilar Escribano1, Teresa Peláez2, Emilio Bouza2
1Clinical Microbiology and Infectious Diseases Department, Hospital General Universitario Gregorio Marañón, Universidad Complutense de Madrid, Madrid, Spain Instituto de Investigación Sanitaria del Hospital Gregorio Marañón, Madrid, Spain CIBER de Enfermedades Respiratorias (CIBERES CB06/06/0058), Madrid, Spain.
Short tandem repeats of Aspergillus fumigatus (STRAf) genotyping cannot distinguish between invasive and colonizing Aspergillus fumigatus. This study found no significant difference in genotypes between invasive and colonized patients, limiting its clinical application.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Genetics
Background:
- Aspergillus fumigatus is a common fungus that can cause invasive aspergillosis, a serious infection, particularly in immunocompromised individuals.
- Distinguishing between invasive and colonizing A. fumigatus infections is crucial for appropriate patient management and treatment.
- Short tandem repeat (STR) genotyping has been explored as a tool for fungal strain differentiation.
Purpose of the Study:
- To evaluate the utility of short tandem repeats of Aspergillus fumigatus (STRAf) genotyping in differentiating between invasive and colonizing isolates of A. fumigatus.
- To determine if specific STRAf genotypes are associated with invasive aspergillosis versus colonization.
Main Methods:
- Analysis of 1,373 A. fumigatus isolates from patients.
- Genotyping of isolates using short tandem repeats of Aspergillus fumigatus (STRAf).
- Comparison of genotype profiles between isolates from patients with invasive aspergillosis and those with A. fumigatus colonization.
Main Results:
- A total of 395 distinct genotypes were identified among the 1,373 isolates.
- Fifty genotypes formed clusters, with 24 genotypes (6% of all genotypes) found in both invasive and colonized patient groups.
- No significant correlation was found between specific STRAf genotypes and the clinical presentation (invasive vs. colonizing).
Conclusions:
- Short tandem repeats of Aspergillus fumigatus (STRAf) genotyping is not a reliable method for discriminating between invasive and colonizing A. fumigatus isolates.
- The overlap in genotypes suggests that STRAf analysis alone cannot differentiate the clinical status of A. fumigatus infection.
- Further research may be needed to identify alternative molecular markers or approaches for differentiating invasive from colonizing A. fumigatus.
