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Related Experiment Videos

Budding yeast chromosome structure and dynamics during mitosis.

C G Pearson1, P S Maddox, E D Salmon

  • 1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA. cgpearso@email.unc.edu

The Journal of Cell Biology
|March 21, 2001
PubMed
Summary

Sister centromeres in budding yeast oscillate before anaphase B. DNA

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Sister chromatid cohesion is crucial for accurate chromosome segregation during cell division.
  • The dynamics of centromeres and chromosome arms before anaphase remain incompletely understood.

Purpose of the Study:

  • To investigate the behavior of sister centromeres and chromosome arms prior to anaphase onset in budding yeast.
  • To elucidate the role of DNA elasticity in chromosome segregation dynamics.

Main Methods:

  • Utilized green fluorescent protein (GFP) probes for live-cell imaging.
  • Employed rapid acquisition of high-resolution fluorescence microscopy to track centromere and chromatin movement.
  • Analyzed movement rates in relation to microtubule dynamics and spindle elongation.

Main Results:

  • Sister centromeres oscillate between spindle poles before anaphase B, with movement rates mirroring microtubule dynamics.
  • Pre-anaphase centromere separation is variable, with occasional reassociations; chromosome arms are neither aligned nor separated.
  • During anaphase A, centromere-to-pole movement is synchronous and coincides with spindle pole separation (anaphase B).
  • Stretched chromatin proximal to centromeres shows rapid elastic recoil, moving faster than centromeres, suggesting a role in arm segregation.

Conclusions:

  • Pre-anaphase centromere dynamics involve oscillations and variable separation.
  • Chromosome arm segregation is influenced by elastic properties of DNA, contributing to poleward movement.
  • Findings reveal a previously uncharacterized role for DNA elasticity in chromosome segregation mechanics.

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