Molecular Markers Reveal Epidemiological Patterns and Evolutionary Histories of the Human Pathogenic Cryptococcus

Area of Science:

• Medical Mycology
• Molecular Epidemiology
• Evolutionary Biology

Background:

• Pathogenic *Cryptococcus* species cause fungal meningitis and cryptococcosis.
• At least eight divergent lineages exist, with distinct distributions.
• Understanding their epidemiology and evolution is crucial for public health.

Purpose of the Study:

• To review and discuss strain typing methods for human pathogenic *Cryptococcus*.
• To analyze the impact of molecular markers on understanding cryptococcal epidemiology and evolution.
• To identify challenges and future directions in *Cryptococcus* strain typing.

Main Methods:

• Review of various strain typing techniques including serotyping, DNA-based methods (RFLP, AFLP, PCR fingerprinting, MLST, WGS), and mass spectrometry.
• Discussion of advantages and disadvantages of each method.
• Analysis of molecular markers derived from these methods.

Main Results:

• Strain typing has elucidated phylogenetic patterns, origins, and dispersal of *Cryptococcus* lineages.
• Revealed genetic variation across regions/niches, recent hybridization events, and intra-patient mutations.
• Highlighted limitations and ongoing controversies in current methods.

Conclusions:

• Strain typing has significantly advanced the understanding of *Cryptococcus* epidemiology and evolution.
• Multilocus sequence typing (MLST) and whole genome sequencing (WGS) are emerging as superior methods.
• These advanced techniques are essential for future cryptococcosis research and surveillance.