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Genetic contribution to high temperature tolerance in Cryptococcus neoformans.

Piotr R Stempinski1, Jessica M Zielinski1, Nadir H Dbouk2

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Cryptococcus neoformans temperature tolerance involves calcineurin and septins. A temperature gradient assay identified 46 genes, including CDC11, crucial for growth at 37°C and revealing new insights into fungal adaptation.

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Area of Science:

  • Microbiology
  • Mycology
  • Molecular Biology

Background:

  • Cryptococcus neoformans is a human fungal pathogen requiring adaptation to host temperature (37°C).
  • Protein phosphatase calcineurin is vital for proliferation at 37°C, but its precise role is unclear.
  • Understanding temperature tolerance mechanisms is crucial for combating fungal infections.

Purpose of the Study:

  • To identify genes contributing to Cryptococcus neoformans temperature tolerance.
  • To define the role of calcineurin and septins in high-temperature growth.
  • To evaluate the utility of a temperature gradient assay for discovering novel genetic factors.

Main Methods:

  • Screened 4031 gene knockouts for temperature sensitivity at 37°C, with and without calcineurin inhibition.
  • Utilized a temperature gradient assay to determine the maximum proliferation temperature (Tmax) for 46 candidate mutants.
  • Assessed cell morphology, cell wall/membrane integrity, and synthetic interactions with calcineurin and septin mutants (CDC12).

Main Results:

  • Identified 46 genes influencing C. neoformans Tmax.
  • Discovered previously uncharacterized genes with synthetic interactions upon calcineurin inhibition.
  • The septin Cdc11 mutant showed significantly reduced Tmax and failed to proliferate without calcineurin activity.
  • The temperature gradient assay identified genes missed by standard growth assays.

Conclusions:

  • The temperature gradient assay is a valuable tool for uncovering genes involved in microbial temperature range.
  • Septins, particularly Cdc11, play a significant role in high-temperature growth and interact with calcineurin signaling.
  • This study provides a deeper understanding of the genetic underpinnings of C. neoformans thermotolerance.