Calyculin A speeds up chromosome movement during anaphase
Author Information
Author(s): Fabian Lacramioara, Joanna Troscianczuk, Arthur Forer
Primary Institution: Department of Biology, York University, Toronto, Ontario, Canada
Hypothesis
Does Calyculin A enhance myosin activity to accelerate anaphase chromosome movement?
Conclusion
Calyculin A accelerates anaphase chromosome movements and causes unexpected backward movements after chromosomes reach the poles.
Supporting Evidence
- Calyculin A treatment resulted in an average chromosome separation velocity of 2.35 μm/min, compared to 1.26 μm/min before treatment.
- Backward movements of chromosomes were observed after they reached the poles, indicating a mechanical process rather than a myosin or actin-driven one.
- Immunofluorescence staining showed increased phosphorylation of myosin regulatory light chain after Calyculin A treatment.
Takeaway
Calyculin A makes chromosomes move faster during cell division and sometimes even makes them move backward after they reach the ends.
Methodology
Living crane-fly spermatocytes were treated with Calyculin A and observed using phase-contrast microscopy.
Limitations
The effects of Calyculin A may vary with concentration and timing of application.
Participant Demographics
Crane-fly spermatocytes (Nephrotoma suturalis Loew).
Digital Object Identifier (DOI)
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