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Related Concept Videos

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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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
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The structure, function, and evolution of plant centromeres.

Matthew Naish1, Ian R Henderson2

  • 1Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom.

Genome Research
|March 14, 2024
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Summary
This summary is machine-generated.

Plant centromeres feature diverse repetitive DNA sequences and retrotransposons, with CENH3 histone variant guiding kinetochore formation. Epigenetic states and recombination drive rapid centromere evolution across eukaryotes.

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Area of Science:

  • Genetics and Molecular Biology
  • Epigenetics
  • Evolutionary Biology

Background:

  • Centromeres are crucial for chromosome segregation, forming kinetochores that attach to spindle microtubules.
  • Centromeric DNA sequences are highly diverse, predominantly repetitive (satellites, transposons), and marked by CENH3 histone variant loading.
  • Plant centromeres often consist of methylated satellite arrays and retrotransposons, which can be sites of CENH3 loading.

Approach:

  • Review of plant centromere structures (monocentric, holocentric, metapolycentric) and their kinetochore site variations.
  • Discussion on how CENH3 loading variations influence genome elimination in plant embryogenesis.
  • Exploration of epigenetic influences on centromere identity and evolutionary models for rapid sequence changes.

Key Points:

  • Centromere DNA sequences are diverse and repetitive, yet functionally conserved for chromosome segregation.
  • CENH3 histone variant is central to kinetochore formation and its loading is dynamically regulated.
  • Plant centromeres exhibit varied architectures, epigenetic modifications, and are shaped by retrotransposon activity and recombination.

Conclusions:

  • Epigenetic states and recombination play significant roles in the rapid evolution of centromere sequences.
  • Understanding plant centromere diversity provides insights into eukaryote-wide centromere structure and function.
  • Variation in CENH3 loading can impact genome stability and evolutionary trajectories in plants.