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DNA replication and cell cycle in plants: learning from geminiviruses.

C Gutierrez1

  • 1Centro de Biología Molecular 'Severo Ochoa', Consejo Superior de Investigaciones Cientificas (CSIC)-Universidad Autónoma de Madrid (UAM), Cantoblanco, 28049 Madrid, Spain. cgutierrez@cbm.uam.es

The EMBO Journal
|March 4, 2000
PubMed
Summary

Geminiviruses avoid plant meristems but induce cell cycle functions for replication. Geminivirus proteins interfere with the retinoblastoma-related (RBR) pathway, influencing cell cycle and growth.

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Area of Science:

  • Plant virology
  • Molecular biology
  • Cell cycle regulation

Background:

  • Plant cell proliferation is confined to meristems.
  • Geminiviruses are DNA viruses that rely on host cell factors for replication.
  • Viral infection is typically excluded from meristematic tissues.

Purpose of the Study:

  • To review the mechanisms by which geminiviruses manipulate the plant cell cycle.
  • To explore how geminiviruses induce cellular states permissive for viral DNA replication.
  • To discuss the role of retinoblastoma-related (RBR) pathway interference.

Main Methods:

  • Literature review of geminivirus-host interactions.
  • Analysis of molecular mechanisms controlling plant cell cycle.
  • Examination of viral protein effects on host gene expression and DNA replication.

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Main Results:

  • Geminiviruses induce S-phase-like conditions for replication, despite being excluded from meristems.
  • Viral proteins interfere with the plant RBR pathway, affecting G(1)-S transition.
  • Geminiviruses can induce abnormal cell proliferation and growth.

Conclusions:

  • Geminivirus replication is tightly coupled to the host cell cycle.
  • Interference with the RBR pathway is a key mechanism for viral DNA replication and host manipulation.
  • Further research is needed to understand the broader effects of geminiviruses on cellular processes.