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Developmental differences in genome replication program and origin activation.

Cathia Rausch1, Patrick Weber1, Paulina Prorok1

  • 1Department of Biology, Technical University of Darmstadt, 64287 Darmstadt, Germany.

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|December 2, 2020
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Summary
This summary is machine-generated.

Mouse embryonic stem cells replicate DNA differently than differentiated cells, with unique timing for heterochromatin and more active origins. This highlights key developmental differences in genome replication and origin activation in pluripotent cells.

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Area of Science:

  • Cell Biology
  • Genetics
  • Epigenetics

Background:

  • DNA replication ensures accurate duplication of genetic material.
  • Replication timing is crucial for cell type and developmental stage.
  • Mouse embryonic stem (mES) cells possess unique characteristics due to their pluripotency.

Purpose of the Study:

  • To investigate the spatio-temporal DNA replication program in undifferentiated and differentiated mES cells.
  • To understand the molecular properties and origin activation patterns of DNA replication in pluripotent cells.

Main Methods:

  • Single-molecule and super-resolution microscopy.
  • Molecular combing and genome-wide origin mapping.
  • Analysis of DNA replication timing, chromatin condensation, and acetylation.

Main Results:

  • Telomeres replicate throughout S-phase; pericentromeric heterochromatin replicates mid-S in mES cells, switching to late-S upon differentiation.
  • Replication timing reversal correlates with increased chromatin condensation and decreased acetylation.
  • mES cells activate twice as many origins, spaced at half the distance compared to somatic cells.
  • Each replication nanofocus corresponds to an individual replicon, with up to 25% being unidirectional forks.

Conclusions:

  • Pluripotent mES cells exhibit distinct DNA replication programs compared to differentiated cells.
  • Developmental changes significantly alter replication timing and chromatin structure.
  • mES cells utilize a unique origin activation strategy, with a higher density of origins.