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Circadian programming in cyanobacteria.

T Mori1, C H Johnson

  • 1Department of Biological Sciences, Vanderbilt University, Nashville, TN 37235, USA.

Seminars in Cell & Developmental Biology
|July 21, 2001
PubMed
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Cyanobacteria possess a biological clock regulating gene expression independently of cell division. Aligning this internal clock with environmental cycles enhances bacterial fitness and survival.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Chronobiology

Background:

  • Prokaryotic cyanobacteria exhibit robust circadian rhythms.
  • These biological clocks regulate global gene expression.
  • The timing mechanism is independent of the cell division cycle.

Purpose of the Study:

  • To investigate the genetic basis of circadian rhythms in cyanobacteria.
  • To understand the relationship between circadian period and environmental cycles.
  • To propose a novel model for the core circadian clockwork.

Main Methods:

  • Competition experiments were conducted.
  • Mutational analyses were performed to identify clock genes.
  • A new model for the core clockwork was developed.

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Main Results:

  • Circadian period consonant with environmental cycles enhances fitness.
  • Three cyanobacterial clock genes were identified.
  • One identified gene is related to DNA recombinases and helicases.

Conclusions:

  • Circadian rhythms in cyanobacteria are crucial for fitness.
  • The identified clock genes play a role in regulating these rhythms.
  • Rhythmic changes in chromosome status likely underlie gene expression rhythms.