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Characterization of thermosensitive mutants of Physarum polycephalum a plasmodial screening method for cell cycle
M Wright1, L Del Castillo, M L Oustrin
1Laboratoire de Pharmacologie et de Toxicologie Fondamentales, CNRS, 205 route de Narbonne, F-31078, Toulouse Cedex, France.
Abstract:
A screening procedure for cell cycle mutants among is mutants of Physarum has been developed for unsynchronized microplasmodia. The synchronization of the microplasmodia and the ratio of pre- to post-mitotic nuclei were evaluated after a transient shift-up to the non-permissive temperature. In contrast with wild type and is mutants not blocked in a cell cycle event, putative cell cycle mutants were synchronized. Among them, three strains which showed a reduction of DNA synthesis had an abnormally increased ratio of pre- to post-mitotic nuclei. Thus, this methodology seems to be efficient and more rapid than the previously published procedures for detecting cell-cycle mutants of Physarum.
Insights
A new method efficiently screens for cell cycle mutants in Physarum using temperature shifts. It identifies mutants by observing synchronized microplasmodia and altered DNA synthesis, speeding up mutant detection.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Identifying cell cycle mutants is crucial for understanding eukaryotic cell division.
- Physarum offers a unique model system for studying cell cycle regulation.
- Existing methods for Physarum cell cycle mutant screening can be time-consuming.
Purpose of the Study:
- To develop an efficient and rapid screening procedure for cell cycle mutants in Physarum.
- To validate a new methodology for detecting synchronized microplasmodia and altered nuclear ratios.
Main Methods:
- Developed a screening procedure for is mutants of Physarum using unsynchronized microplasmodia.
- Utilized a transient shift-up to a non-permissive temperature for synchronization.
- Evaluated microplasmodia synchronization and the ratio of pre- to post-mitotic nuclei.
Main Results:
- Putative cell cycle mutants synchronized in response to temperature shift, unlike wild type.
- Three strains with reduced DNA synthesis showed an increased pre- to post-mitotic nuclei ratio.
- The new methodology proved efficient and faster than previous procedures.
Conclusions:
- The developed temperature-shift method is effective for screening Physarum cell cycle mutants.
- This approach allows for rapid identification of mutants affecting DNA synthesis and nuclear division.
- The methodology enhances the study of cell cycle regulation in Physarum.
