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Related Experiment Video

Updated: Jan 23, 2026

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

Published on: December 19, 2014

amdS as a dominant recyclable marker in Cryptococcus neoformans.

Paige E Erpf¹, Christina J Stephenson¹, James A Fraser¹

¹Australian Infectious Diseases Research Centre, School of Chemistry & Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia.

Fungal Genetics and Biology : FG & B

|June 21, 2019

Summary

Researchers developed a new genetic tool for studying the fungal pathogen Cryptococcus neoformans. This dominant recyclable marker, based on the amdS gene, enables precise genome manipulation and gene essentiality studies in this important human pathogen.

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Area of Science:

Mycology
Molecular Biology
Genetics

Background:

Cryptococcus neoformans is a significant fungal pathogen causing mortality in immunocompromised individuals.
Limited molecular tools hinder comprehensive study of C. neoformans pathogenesis.
Existing genetic manipulation techniques for C. neoformans are insufficient for advanced research.

Purpose of the Study:

To develop a novel, dominant, and recyclable genetic marker for C. neoformans.
To enable precise genome manipulation and functional studies in C. neoformans.
To create a versatile toolkit for gene deletion, modification, and essentiality assays.

Main Methods:

Heterologous expression of the Aspergillus nidulans amdS gene in C. neoformans.
Utilizing acetamidase activity for dominant selection on acetamide as a nitrogen source.
Exploiting fluoroacetamide sensitivity for counterselection.
Developing sequential gene deletion and marker recycling strategies.

Main Results:

Demonstrated successful heterologous expression and function of the amdS gene in C. neoformans.
Confirmed acetamide as a viable nitrogen source without impacting fungal virulence.
Established fluoroacetamide sensitivity for efficient counterselection.
Created a suite of tools for markerless gene deletion, fluorescent protein tagging, and gene essentiality determination.

Conclusions:

The developed amdS-based system provides a powerful and versatile genetic toolkit for C. neoformans research.
This system significantly enhances the ability to study gene function and pathogenicity mechanisms.
Facilitates advanced genetic engineering for understanding fungal biology and developing therapeutic strategies.