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Rapid method for cell cycle analysis in a predatory marine dinoflagellate
A S Whiteley1, P H Burkill, M A Sleigh
1Plymouth Marine Laboratory, United Kingdom.
Cytometry
|November 1, 1993
Summary
This study developed a new method to analyze the cell cycle of the predatory dinoflagellate Oxyrrhis marina. Results show Oxyrrhis spends most of its cell cycle in G2+M, unlike other species.
Area of Science:
- Marine Biology
- Protistology
- Cell Biology
Background:
- Oxyrrhis marina is a predatory marine dinoflagellate.
- Understanding its cell cycle dynamics is crucial for ecological and biological studies.
- Existing methods struggle to differentiate predator from prey cells.
Purpose of the Study:
- To develop a rapid method for isolating and analyzing Oxyrrhis marina nuclei.
- To study the cell cycle dynamics of Oxyrrhis marina.
- To differentiate predator nuclei from prey nuclei during analysis.
Main Methods:
- Nuclei isolation using low salt buffer, detergent, and mechanical agitation.
- DNA staining with Hoechst 33258 in a one-step procedure.
- Flow cytometry for discrimination and cell cycle analysis.
Main Results:
- High efficiency (>95%) nuclear isolation from Oxyrrhis.
- Successful discrimination between Oxyrrhis and prey cell nuclei.
- Oxyrrhis spends approximately 50% of its cell cycle in G2+M during active division.
Conclusions:
- The developed method is effective for studying Oxyrrhis marina cell cycle dynamics.
- Oxyrrhis marina exhibits unique cell cycle partitioning, with a prolonged G2+M phase.
- Evidence suggests the presence of specific cell cycle control points in both G1 and G2 phases.