Molecular typing of IberoAmerican Cryptococcus neoformans isolates

Area of Science:

• Mycology
• Infectious Diseases
• Molecular Biology

Background:

• Cryptococcus neoformans is a significant fungal pathogen.
• Understanding its molecular epidemiology is crucial for public health.
• Previous studies have established molecular types for C. neoformans.

Purpose of the Study:

• To establish a network for basic knowledge acquisition of C. neoformans in IberoAmerican countries.
• To molecularly characterize clinical, veterinary, and environmental isolates of C. neoformans from the region.
• To determine the prevalence of different molecular types within the study population.

Main Methods:

• Utilized M13 polymerase chain reaction (PCR)-fingerprinting for isolate typing.
• Employed orotidine monophosphate pyrophosphorylase (URA5) gene restriction fragment length polymorphism (RFLP) analysis with HhaI and Sau96I double digestion.
• Analyzed 340 isolates from nine IberoAmerican countries and Spain.

Main Results:

• Both typing methods successfully grouped isolates into eight previously defined molecular types.
• The VNI molecular type (var. grubii, serotype A) was the most prevalent, accounting for 68.2% of isolates.
• Other identified types included VNII, VNIII, VNIV, and four genotypes (VGI-VGIV) encompassing var. gatii serotypes B and C.

Conclusions:

• The predominance of the VNI type aligns with its known association with human cryptococcal infections globally.
• The study provides valuable molecular epidemiological data for C. neoformans in the IberoAmerica region.
• This network-based approach facilitates ongoing surveillance and research into C. neoformans.