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Spatial control of mitosis by the GTPase Ran.

M Ciciarello1, R Mangiacasale, P Lavia

  • 1Institute of Molecular Biology and Pathology, CNR National Research Council, c/o University La Sapienza, Via degli Apuli 4, 00185 Rome, Italy.

Cellular and Molecular Life Sciences : CMLS
|May 8, 2007
PubMed
Summary
This summary is machine-generated.

Mitosis errors can destabilize cells. The small GTPase Ran protein regulates mitosis, with complex, specific roles in mammalian somatic cells, ensuring accurate genetic identity transmission.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitosis is crucial for transmitting genetic identity; errors lead to aneuploidy and genomic instability.
  • The small GTPase Ran is a key regulator of mitotic processes.
  • Early studies in amphibians highlighted Ran's role in spindle assembly, but its function in somatic cells is more complex.

Purpose of the Study:

  • To review the current understanding of Ran's control over mitosis.
  • To highlight the specific mechanisms of Ran in mammalian somatic cells.
  • To emphasize the spatiotemporal regulation of Ran network components during mitosis.

Main Methods:

  • Literature review of studies on Ran GTPase and mitotic regulation.
  • Analysis of data from amphibian oocytes and mammalian somatic cells.
  • Focus on newly identified Ran target factors and their specificities.

Main Results:

  • Ran, particularly in its GTP-bound form, influences spindle assembly and dynamics.
  • Ran exhibits higher specificity and complexity in mitotic control within somatic cells.
  • Mitotic progression depends on the precise spatial and temporal localization of Ran network components.

Conclusions:

  • Ran is essential for accurate chromosome segregation during mitosis.
  • Specific Ran effectors and their precise localization are critical for controlled mitotic progression in mammalian somatic cells.
  • Understanding Ran's complex regulatory network is key to preventing aneuploidy and associated diseases.