The cell cycle of Chlamydomonas reinhardtii: the role of the commitment point
Language English Country United States Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
17571796
DOI
10.1007/bf02932138
Knihovny.cz E-resources
- MeSH
- Cell Division MeSH
- Cell Cycle physiology MeSH
- Time Factors MeSH
- Chlamydomonas reinhardtii cytology growth & development physiology MeSH
- DNA Replication MeSH
- Light MeSH
- Temperature MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Chlamydomonas reinhardtii cells can double their size several times during the light period before they enter the division phase. To explain the role of the commitment point (defined as the moment in the cell cycle after which cells can complete the cell cycle independently of light) and the moment of initiation of cell division we investigated whether the timing of commitment to cell division and cell division itself are dependent upon cell size or if they are under control of a timer mechanism that measures a period of constant duration. The time point at which cells attain commitment to cell division was dependent on the growth rate and coincided with the moment at which cells have approximately doubled in size. The timing of cell division was temperature-dependent and took place after a period of constant duration from the onset of the light period, irrespective of the light intensity and timing of the commitment point. We concluded that at the commitment point all the prerequisites are checked, which is required for progression through the cell cycle; the commitment point is not the moment at which cell division is initiated but it functions as a checkpoint, which ensures that cells have passed the minimum cell size required for the cell division.
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