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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Centromeres.

Lisa E Kursel1, Harmit S Malik2

  • 1Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, WA 98195, USA.

Current Biology : CB
|June 22, 2016
PubMed
Summary

Centromeres ensure accurate chromosome segregation during cell division. Despite their essential role, the defining features and commonalities across diverse eukaryotic centromeres remain largely unexplained, presenting a perplexing biological puzzle.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Centromeres are critical chromosomal regions essential for eukaryotic cell division.
  • They physically link chromosomes to the spindle apparatus, ensuring accurate genetic material distribution.
  • Understanding centromere function is fundamental to comprehending genome stability.

Purpose of the Study:

  • To define the characteristics of a functional centromere.
  • To identify common features shared by centromeres across different species.
  • To explore the diversity in centromere structure and function.

Main Methods:

  • Review of existing literature on centromere biology.
  • Analysis of data concerning centromere size and architecture.
  • Examination of studies on centromeric DNA sequences and proteins.

Main Results:

  • Centromeres exhibit significant diversity in size, DNA sequence, and protein composition across eukaryotes.
  • Despite variations, all functional centromeres mediate spindle attachment.
  • No single universal feature defines all centromeres, leading to a perplexing lack of explanation for their diversity.

Conclusions:

  • Centromere form and function display remarkable variation among different organisms.
  • The underlying principles governing this diversity remain largely enigmatic.
  • Further research is needed to reconcile the essential role of centromeres with their observed heterogeneity.