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Stringent Response in E. coli

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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

Published on: March 19, 2015

Transcriptomic response of Cryptococcus neoformans to ecologically relevant nitrogen concentrations.

Caylin Bosch¹, Zoë Bhana¹, Barbra Toplis¹

¹Department of Microbiology, Stellenbosch University, Van der Bijl Street, Stellenbosch, South Africa.

FEMS Yeast Research

|April 24, 2021

Summary

Cryptococcus neoformans adapts to low nitrogen environments by altering virulence and antifungal tolerance gene expression. This transcriptomic response is crucial for survival in nitrogen-poor ecological niches.

Keywords:

Cryptococcus neoformans RNA-sequencing antifungal tolerance nitrogen transcriptome virulence

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Area of Science:

Microbiology
Environmental Science
Genomics

Background:

Nitrogen availability is critical for Cryptococcus neoformans survival.
C. neoformans inhabits diverse ecological niches, including nitrogen-rich guano and nitrogen-limited woody debris.
Previous studies linked nitrogen limitation to cryptococcal virulence and drug tolerance.

Purpose of the Study:

To investigate the transcriptomic response of C. neoformans to ecologically relevant nitrogen concentrations.
To identify the genetic mechanisms underlying adaptation to nitrogen-limited environments.

Main Methods:

RNA-sequencing was employed to analyze gene expression profiles.
C. neoformans was exposed to varying, ecologically relevant nitrogen concentrations.

Main Results:

Low nitrogen conditions significantly modulated the expression of numerous virulence genes, including CTR4 and CGP1.
Genes associated with antifungal tolerance, such as those in ergosterol biosynthesis and cell wall integrity, were upregulated.
Transcriptomic analysis revealed a distinct genetic response to nitrogen deficiency.

Conclusions:

Nitrogen-poor conditions induce significant transcriptomic changes in C. neoformans.
These adaptations enhance survival in challenging ecological niches.
Understanding this response may inform strategies related to cryptococcal pathobiology.