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Kinetochore size variation in mammalian chromosomes: an image analysis study with evolutionary implications
L M Cherry1, A J Faulkner, L A Grossberg
1Department of Psychiatry and Behavioral Sciences, University of Texas Mental Sciences Institute, Houston 77030.
Journal of Cell Science
|February 1, 1989
Summary
Kinetochore size variation was measured using immunofluorescence and image analysis. Results show reproducible estimates correlating with electron microscopy, suggesting a minimum kinetochore size is crucial for chromosome stability.
Area of Science:
- Cell Biology
- Genetics
- Microscopy
Background:
- The kinetochore is essential for spindle microtubule attachment to chromosomes during cell division.
- Understanding kinetochore size variation is key to comprehending chromosome stability and evolution.
Purpose of the Study:
- To assess kinetochore surface area variation using immunofluorescence and computer-assisted image analysis.
- To validate these measurements against electron micrograph data.
- To investigate kinetochore size differences across species, sexes, and cell types.
Main Methods:
- Utilized anti-kinetochore indirect immunofluorescence to visualize kinetochores.
- Employed computer-assisted image analysis to measure kinetochore surface areas.
- Compared measurements with those obtained from electron micrographs.
Main Results:
- Developed a reproducible system for estimating kinetochore size.
- Demonstrated a strong correlation (r = 0.95) between immunofluorescence and electron micrograph measurements.
- Observed measurable kinetochore size differences between human cell lines, with leptokurtotic and positively skewed distributions.
Conclusions:
- Mammalian chromosomes likely require a minimum kinetochore size for stable spindle attachment.
- Larger kinetochores appear functional, suggesting plasticity that supports chromosomal evolutionary adaptability.
- Kinetochore size variation provides insights into chromosome mechanics and evolution.