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A geothermal amoeba sets a new upper temperature limit for eukaryotes.

H Beryl Rappaport1,2, Natalie A Petek-Seoane3, Tomas Tyml2

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Summary
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A newly discovered geothermal amoeba, Incendiamoeba cascadensis, sets a new upper temperature limit for eukaryotic life, dividing at 63°C. This finding expands our understanding of extremophile eukaryotes and their survival capabilities in extreme heat.

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Area of Science:

  • Extremophile biology
  • Eukaryotic cell biology
  • Geothermal microbiology

Background:

  • The study of life's temperature limits has primarily focused on prokaryotes (bacteria and archaea).
  • Understanding the upper thermal boundaries for eukaryotic life is crucial for defining habitability.
  • Previous research has not extensively explored high-temperature limits in eukaryotes.

Purpose of the Study:

  • To identify and characterize a novel eukaryotic microorganism from a geothermal environment.
  • To establish a new record for the upper temperature limit of cell division in eukaryotes.
  • To investigate the genomic and cellular adaptations of a high-temperature-tolerant eukaryote.

Main Methods:

  • Isolation and cultivation of a novel geothermal amoeba, Incendiamoeba cascadensis.
  • Growth experiments to determine cellular proliferation at high temperatures.
  • Expansion microscopy and high-temperature live-cell imaging to visualize mitosis and motility.
  • Genome assembly and comparative genomics analysis.

Main Results:

  • Incendiamoeba cascadensis was isolated and demonstrated cell division at 63°C (145.4°F), a new record for eukaryotes.
  • Cellular proliferation and motility were confirmed at temperatures up to 64°C.
  • Genomic analysis revealed an enrichment of genes associated with proteostasis, genome stability, and environmental sensing.

Conclusions:

  • The discovery of Incendiamoeba cascadensis challenges existing paradigms regarding temperature constraints on eukaryotic life.
  • Eukaryotic life can persist and thrive at higher temperatures than previously understood.
  • The findings provide insights into the molecular mechanisms enabling survival in extreme thermal environments.