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Nonreplicative functions of the origin recognition complex.

Varvara V Popova1, Alexander V Brechalov1, Sofia G Georgieva1

  • 1a Department of Transcription Regulation and Chromatin Dynamics , Institute of Gene Biology, Russian Academy of Sciences , Moscow , Russia.

Nucleus (Austin, Tex.)
|September 11, 2018
PubMed
Summary
This summary is machine-generated.

The Origin Recognition Complex (ORC) is crucial for DNA replication and also plays vital roles in chromosome organization, cell division, and mRNA export in eukaryotes.

Keywords:
HP1ORCOrigin recognition complexSIRTREX-2centrosomescohesinmRNA exportmRNPsister chromatids

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The Origin Recognition Complex (ORC) is a key regulator of DNA replication initiation in eukaryotes.
  • Emerging evidence suggests ORC has diverse non-replicative functions beyond its canonical role.
  • These functions are conserved across various model organisms, including yeast, flies, frogs, and mammals.

Purpose of the Study:

  • To consolidate and present the non-replicative functions of the Origin Recognition Complex (ORC).
  • To highlight the diverse roles of ORC in cellular processes beyond DNA replication.
  • To underscore the evolutionary expansion of ORC functions with increasing organismal complexity.

Main Methods:

  • Review of recent scientific literature and experimental data.
  • Analysis of ORC-DNA interactions and their functional consequences.
  • Investigation of ORC's involvement in chromatin structure and cell division.

Main Results:

  • ORC and its subunits are involved in heterochromatin formation, chromosome condensation, and segregation.
  • ORC plays a role in cell division control, including centrosome duplication and cytokinesis.
  • ORC interacts with messenger ribonucleoprotein particles (mRNPs), facilitating mRNA nuclear export.

Conclusions:

  • ORC exhibits multifaceted functions essential for eukaryotic cell biology.
  • ORC-DNA interactions are critical for many of its non-replicative roles.
  • The complexity of ORC functions has evolved alongside organismal complexity, with emerging roles for sub-complexes and individual subunits.