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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Links between genome replication and chromatin landscapes.

Joana Sequeira-Mendes1, Crisanto Gutierrez1

  • 1Centro de Biologia Molecular Severo Ochoa, CSIC-UAM, Nicolas Cabrera 1, Cantoblanco, 28049, Madrid, Spain.

The Plant Journal : for Cell and Molecular Biology
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Summary

Plant organogenesis relies on precise cell division and genome replication. Chromatin landscape critically influences DNA replication timing and accuracy, ensuring genomic integrity during development.

Keywords:
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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Plant Science

Background:

  • Post-embryonic organogenesis in plants necessitates continuous cell production, expansion, and differentiation.
  • Genome replication is vital for cell cycle progression and maintaining genomic integrity during development.
  • Chromatin duplication involves coordinated DNA replication, histone deposition, and modification introduction.

Purpose of the Study:

  • To review current understanding of genome replication in plants, focusing on Arabidopsis.
  • To highlight the role of the chromatin landscape in regulating DNA replication.
  • To discuss the impact of genomic approaches on future research in this field.

Main Methods:

  • Literature review and synthesis of existing data on plant genome replication.
  • Analysis of chromatin accessibility and histone modifications in relation to replication origins.
  • Examination of re-replication avoidance mechanisms.

Main Results:

  • Chromatin accessibility is crucial for initiating DNA replication and specifying replication origins.
  • Histone modifications and chromatin signatures influence replication timing during S phase.
  • Specific histone modifications contribute to preventing heterochromatin re-replication.

Conclusions:

  • The chromatin landscape is a key regulator of genome replication in plants and animals.
  • Existing views on replication origins and epigenetic modifications require critical evaluation.
  • Genomic approaches promise significant advances in understanding genome replication.