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Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
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RNA dynamics in aging bacterial spores.

Einat Segev1, Yoav Smith, Sigal Ben-Yehuda

  • 1Department of Microbiology and Molecular Genetics, Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, The Hebrew University of Jerusalem, 91120 Jerusalem, Israel.

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Bacterial spores of Bacillus subtilis show dynamic RNA changes during early dormancy. Environmental factors like temperature influence RNA degradation or transcription, affecting spore germination and challenging the concept of a static dormant state.

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Molecular Biology

Background:

  • Bacillus subtilis forms highly resilient spores upon starvation.
  • Spore dormancy is traditionally considered a static, unchanging state.
  • The molecular dynamics within dormant spores are not fully understood.

Purpose of the Study:

  • To investigate the dynamic changes in RNA profiles of Bacillus subtilis spores during early dormancy.
  • To determine the influence of environmental conditions (temperature) on spore RNA and dormancy.
  • To assess how spore age and RNA state affect germination.

Main Methods:

  • Monitoring RNA profiles of aging Bacillus subtilis spores under different temperature conditions.
  • Analyzing RNA degradation and potential transcription in spores.
  • Assessing spore germination rates in relation to age, temperature, and RNA state.

Main Results:

  • Spore RNA profiles are highly dynamic in the days following sporulation.
  • High temperatures induce global RNA degradation in aging spores.
  • Low temperatures preserve RNA and show evidence of transcription in aging spores.
  • Spore germination is significantly influenced by age, incubation temperature, and RNA status.

Conclusions:

  • Spore dormancy is a dynamic process, not a static state, lasting several days.
  • Environmental factors modulate molecular changes in spores during early dormancy.
  • These molecular changes impact the spore's ability to emerge from dormancy (germination).