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Antisense RNA-regulated programmed cell death

K Gerdes1, A P Gultyaev, T Franch

  • 1Department of Molecular Biology, Odense University, Denmark. kgerdes@molbiol.ou.dk

Annual Review of Genetics
|January 1, 1997
PubMed
Summary
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Eubacterial killer genes, part of the hok gene family, stabilize plasmids by eliminating plasmid-free cells. This review details their genetics, molecular biology, and evolution, focusing on complex RNA regulation.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Eubacterial plasmids and chromosomes utilize killer genes from the hok gene family for plasmid stabilization.
  • These killer genes function by eliminating cells that lack the plasmid, ensuring its propagation.

Purpose of the Study:

  • To review the genetics, molecular biology, and evolution of the hok gene family.
  • To elucidate the intricate RNA-based regulatory mechanisms controlling killer mRNA translation.

Main Methods:

  • Detailed description of the antisense RNA-regulated control loop.
  • Analysis of nucleotide covariations in mRNAs to identify metastable stem-loop structures.
  • Investigation of conserved mRNA folding pathways and RNA rearrangements.

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Main Results:

  • Identified metastable stem-loop structures at mRNA 5' ends that prevent premature translation and antisense RNA binding.
  • Provided evidence for a phylogenetically conserved mRNA folding pathway involving dynamic RNA rearrangements.
  • Elucidated a complex mechanism for conditional activation of translation for antisense RNA-regulated mRNAs.

Conclusions:

  • The hok gene family employs sophisticated post-transcriptional and post-segregational regulation for conditional translation activation.
  • Understanding these mechanisms is crucial for comprehending plasmid stabilization and bacterial evolution.
  • Phylogenetic analysis reveals complex relationships between plasmid- and chromosome-encoded hok systems.