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Related Concept Videos

Replication in Eukaryotes01:29

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Do organellar genomes function as long-term redox damage sensors?

Alan F Wright1, Michael P Murphy, Douglass M Turnbull

  • 1Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, Edinburgh EH4 2XU, UK. alan.wright@hgu.mrc.ac.uk

Trends in Genetics : TIG
|June 2, 2009
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Organellar genomes encode essential electron transfer proteins, acting as cellular sensors for redox damage and energy status. This function influences cell survival and organismal health through signaling pathways.

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Area of Science:

  • Mitochondrial and chloroplast biology
  • Cellular signaling
  • Genomics and proteomics

Background:

  • Organellar genomes encode core electron transfer complex proteins, indicating functional importance.
  • Organellar genomes are metabolically expensive and prone to mutations.

Purpose of the Study:

  • To propose that organellar genomes function as sensors of long-term cellular health.
  • To elucidate the role of organellar genomes in cell lineage selection and organismal survival.

Main Methods:

  • Analysis of conserved protein components encoded by organellar genomes.
  • Hypothesizing signaling pathways linking organellar status to nuclear responses.
  • Investigating potential mechanisms of gain-of-function signaling.

Main Results:

  • Organellar genomes may act as sensors of redox damage and bioenergetic competence.
  • These genomes influence retrograde and anterograde signaling pathways.
  • Defective complex assembly could mediate signaling mechanisms.

Conclusions:

  • Organellar proteomes provide feedback on cellular energy and genomic status.
  • This feedback facilitates selection of "fittest" cells and removal of compromised cells.
  • Organellar function is critical for organismal survival and integrity.