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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
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Peroxisomes regulate virulence and cell density sensing in Cryptococcus neoformans.

Ella Jacobs1, Quigly Dragotakes1, Samuel Rodrigues Dos Santos1

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Cryptococcus neoformans uses peroxisomal beta-oxidation for virulence. Disrupting this pathway causes defects, but cell density and mitochondrial retrograde signaling (RTG) regulate these processes.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Pathogenesis

Background:

  • Cryptococcus neoformans is an opportunistic fungal pathogen causing cryptococcosis.
  • Metabolic flexibility is key to C. neoformans survival and virulence.
  • Peroxisomes are crucial for metabolic homeostasis and lipid metabolism.

Purpose of the Study:

  • To investigate the link between nickel exposure, peroxisomal beta-oxidation, and virulence in C. neoformans.
  • To understand the role of peroxisomal beta-oxidation in C. neoformans pathogenesis.
  • To identify novel regulatory pathways connecting metabolism and virulence.

Main Methods:

  • Genetic manipulation of MFE2 and POT1 genes involved in peroxisomal beta-oxidation.
  • Assessment of virulence factor expression and fungal growth under varying conditions.
  • Analysis of cell density-dependent phenotypes and mitochondrial retrograde signaling (RTG).

Main Results:

  • Loss of MFE2 and POT1 resulted in cell density-dependent virulence defects and growth inhibition.
  • Large peroxisomes were observed in mutants, linked to a specific metabolic state.
  • Increased cell density rescued virulence factor phenotypes and growth.
  • Mitochondrial retrograde signaling (RTG) was implicated in cell density sensing and pathway regulation.

Conclusions:

  • Peroxisomal beta-oxidation is critical for C. neoformans virulence.
  • Mitochondrial retrograde signaling (RTG) is a novel regulator of C. neoformans cell density sensing, metabolism, and virulence.
  • Metabolic pathways, particularly peroxisomal functions, are central to cryptococcal pathogenesis.