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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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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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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Kinetochore mutations and histone phosphorylation pattern changes accompany holo- and macro-monocentromere evolution.

Yi-Tzu Kuo1, Pavel Neumann2, Jianyong Chen3

  • 1Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben, Corrensstrasse 3, Seeland, Germany. kuo@ipk-gatersleben.de.

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Centromeres, crucial for cell division, can be monocentric or holocentric. This study reveals divergent evolution of holocentromeres through unique histone patterns and gene mutations, not linked by macro-monocentromeres.

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Area of Science:

  • Genetics and Epigenetics
  • Cell Biology
  • Evolutionary Biology

Background:

  • Centromeres are vital for chromosome segregation during cell division.
  • Most species have monocentric chromosomes (one centromere), but holocentric chromosomes (centromere along the length) exist in some lineages.
  • The evolution of holocentricity is thought to occur independently multiple times.

Purpose of the Study:

  • To investigate the evolutionary divergence of centromere types by comparing two related genera with distinct centromere organizations.
  • To understand the molecular and epigenetic mechanisms underlying the transition from monocentric to holocentric chromosomes.

Main Methods:

  • Comparative genomics and epigenomics of Chamaelirium luteum (macro-monocentromeric) and Chionographis japonica (holocentric).
  • Kinetochore protein analysis and histone phosphorylation pattern assessment.
  • Analysis of synteny and satellite DNA amplification.

Main Results:

  • Both species display unique chromosome-wide histone phosphorylation patterns.
  • Kinetochore analysis revealed conserved and divergent protein compositions between the genera.
  • Evidence suggests de novo holocentromere formation in Chionographis japonica.

Conclusions:

  • Macro-monocentromeres do not appear to be a direct evolutionary intermediate between mono- and holocentromeres.
  • Divergent evolution of holocentromeres likely involves kinetochore gene mutations, altered histone phosphorylation, and satellite DNA amplification.
  • This study provides a model for understanding the independent evolution of holocentric chromosomes.