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Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae
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Transcriptome changes and cAMP oscillations in an archaeal cell cycle.

Anke Baumann1, Christian Lange, Jörg Soppa

  • 1Goethe University, Institute for Molecular Biosciences, Biocentre, Frankfurt, Germany. anke.baum@gmx.de <anke.baum@gmx.de>

BMC Cell Biology
|June 15, 2007
PubMed
Summary

This study optimized cell synchronization in Halobacterium salinarum to reveal cell cycle-regulated gene expression. Cyclic adenosine monophosphate (cAMP) signaling was identified as a key regulator in archaeal cell division.

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Area of Science:

  • Microbiology and Molecular Biology
  • Cell Cycle Regulation
  • Archaea Genomics

Background:

  • The cell cycle involves coordinated processes like growth, DNA replication, and division, tightly regulated by molecular oscillations.
  • While cell cycle transcriptomic changes are known in eukaryotes and some bacteria, they remain largely unexplored in archaea.
  • Oscillations of small signaling molecules in the cell cycle have also been limited to eukaryotes.

Purpose of the Study:

  • To investigate cell cycle-dependent transcriptome dynamics in the archaeon Halobacterium salinarum.
  • To identify potential small signaling molecules involved in archaeal cell cycle progression.
  • To compare transcriptional regulation strategies across different domains of life.

Main Methods:

  • Optimized a synchronization procedure for Halobacterium salinarum to achieve high-fidelity cell division.
  • Employed genome-wide DNA microarrays to analyze cell cycle-regulated gene expression.
  • Quantified cyclic adenosine monophosphate (cAMP) concentrations during the cell cycle.

Main Results:

  • Identified 87 cell cycle-regulated genes (3% of the genome) in H. salinarum, exhibiting distinct expression patterns.
  • Discovered that transcriptional regulation of cell cycle genes in H. salinarum differs significantly from eukaryotes.
  • Found a basal cAMP concentration of 200 microM in H. salinarum, with oscillations preceding and following cell division.

Conclusions:

  • H. salinarum employs a distinct strategy of transcript level regulation during the cell cycle compared to other known species.
  • Cyclic adenosine monophosphate (cAMP) is a significant signaling molecule in archaea, with potential roles in cell cycle progression.
  • Oscillating cAMP levels suggest a conserved, ancient role for this signaling pathway in cell cycle control across archaea and eukaryotes.