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G(1) to S transition: more than a cell cycle engine switch
Crisanto Gutierrez1, Elena Ramirez-Parra, M Mar Castellano
1Centro de Biologia Molecular 'Severo Ochoa', Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain. cgutierrez@cbm.uam.es
Abstract:
CDK-cyclin complexes are the universal drivers of cell cycle transitions. Progression through G(1) and transition to S-phase, thereby initiating genome duplication, requires the concerted action of cyclin-dependent kinase (CDK)-cyclin complexes on specific targets. These targets belong to at least two major regulatory networks: the retinoblastoma-related (RBR)/E2F pathway and complexes that are responsible for the initiation of DNA replication. The G(1) phase is central to the integration of signals that regulate both the exit from the cell division cycle to differentiation and the reactivation of cell proliferation. Cellular factors that are involved in these pathways play a role in regulating cell size and number, and organogenesis. As a consequence, they are also involved in determining plant architecture.
Insights
Cyclin-dependent kinase (CDK)-cyclin complexes drive cell cycle transitions, including G1 to S-phase, essential for DNA replication. These pathways regulate plant growth, cell size, and overall architecture.
Area of Science:
- Plant Biology
- Molecular Biology
- Cell Biology
Background:
- Cell cycle progression is tightly regulated by cyclin-dependent kinase (CDK)-cyclin complexes.
- These complexes are crucial for transitions between cell cycle phases, particularly G1 to S-phase, initiating DNA replication.
Purpose of the Study:
- To elucidate the role of CDK-cyclin complexes in regulating cell cycle transitions.
- To understand how these complexes influence DNA replication initiation and plant development.
Main Methods:
- The study focuses on the molecular mechanisms of CDK-cyclin action.
- Analysis of regulatory networks, including the retinoblastoma-related (RBR)/E2F pathway and DNA replication initiation complexes.
Main Results:
- CDK-cyclin complexes are universal drivers of cell cycle transitions, governing G1 to S-phase progression.
- Key targets are involved in DNA replication initiation and the RBR/E2F pathway.
- These factors regulate cell size, number, and organogenesis, ultimately influencing plant architecture.
Conclusions:
- CDK-cyclin complexes are central regulators of cell cycle progression and DNA replication.
- The G1 phase integrates signals for differentiation and proliferation, impacting plant development and architecture.