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Kinetochore staining in multicentric chromosomes of murine cancer cell lines
1Department of Cell Biology, University of Texas M. D. Anderson Hospital and Tumor Institute, Houston 77030.
Abstract:
The production of multicentric chromosomes is a common event in neoplastic or evolutionary change. If these compound chromosomes are to remain intact, the microtubule-binding ability of one of the kinetochores must be inactivated. This inactivation could occur by an actual deletion of chromosome material, or by some conformational change which would serve to interrupt microtubule binding. To answer this question, staining techniques are required which are specific for structural elements contained in the kinetochore. Stable compound chromosomes were studied in two murine cancer cell lines to see if there is concordance among the currently available light microscope techniques reported to stain the kinetochore. It was discovered that many commonly used approaches give no direct information about the presence of kinetochore activity or kinetochore structural elements. This information is available, however, using antikinetochore antibody immunofluorescence. The method demonstrates that kinetochore inactivation is a complex and gradual event, involving the loss of at least some of the kinetochore-specific proteins.
Insights
Multicentric chromosome production requires kinetochore inactivation. Antikinetochore antibody immunofluorescence reveals this inactivation is gradual, involving loss of kinetochore proteins, not just structural deletion.
Area of Science:
- Cell Biology
- Cancer Research
- Genetics
Background:
- Multicentric chromosomes are common in cancer and evolution.
- Kinetochore inactivation is essential for stable multicentric chromosome formation.
- Mechanisms of kinetochore inactivation (deletion vs. conformational change) are unclear.
Purpose of the Study:
- To investigate the mechanism of kinetochore inactivation in stable compound chromosomes.
- To evaluate the efficacy of different staining techniques for kinetochore analysis.
- To determine if kinetochore inactivation involves structural deletion or protein loss.
Main Methods:
- Studied stable compound chromosomes in two murine cancer cell lines.
- Compared various light microscope staining techniques for kinetochore structural elements.
- Utilized antikinetochore antibody immunofluorescence for detailed kinetochore analysis.
Main Results:
- Many standard light microscopy techniques failed to provide direct information on kinetochore activity or structure.
- Antikinetochore antibody immunofluorescence effectively visualized kinetochore components.
- Kinetochore inactivation was shown to be a complex, gradual process, not a simple deletion.
Conclusions:
- Kinetochore inactivation involves the progressive loss of specific kinetochore proteins.
- Antikinetochore antibody immunofluorescence is a superior method for studying kinetochore dynamics.
- Understanding kinetochore inactivation is crucial for comprehending neoplastic and evolutionary chromosomal changes.