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Related Concept Videos

Transcription Elongation Factors02:35

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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Related Experiment Video

Updated: Dec 14, 2025

Determination of S-Phase Duration Using 5-Ethynyl-2'-deoxyuridine Incorporation in Saccharomyces cerevisiae
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E2F-dependent transcription determines replication capacity and S phase length.

Betheney R Pennycook1,2, Eva Vesela1, Silvia Peripolli1

  • 1MRC Laboratory for Molecular Cell Biology, University College London, Gower street, London, WC1E 6BT, UK.

Nature Communications
|July 16, 2020
PubMed
Summary
This summary is machine-generated.

E2F-dependent transcription controls a cell's DNA replication capacity by regulating fork speed. This mechanism influences S-phase duration and genome duplication, impacting cell cycle progression.

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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA replication timing is crucial for cell cycle progression and is tightly regulated during S-phase.
  • S-phase duration is determined by DNA synthesis rate, influenced by replication fork number and velocity.

Purpose of the Study:

  • To investigate the role of E2F-dependent transcription in determining cellular DNA replication capacity.
  • To elucidate how E2F6 influences replication rates and S-phase length.

Main Methods:

  • Analysis of E2F-dependent transcription during S-phase.
  • Measurement of DNA synthesis rates and replication fork velocity.
  • Assessment of DNA damage and cell cycle progression.

Main Results:

  • E2F-dependent transcription, specifically via E2F6, dictates maximal DNA synthesis rate (replication capacity).
  • Modulating E2F-dependent transcription alters replication rates by changing fork speed, not fork number.
  • Increased fork speed elevates DNA damage, leading to cell cycle arrest.

Conclusions:

  • E2F-dependent transcription is a key determinant of cellular replication capacity.
  • Regulation of replication fork speed by E2F transcription factors controls S-phase duration.
  • This mechanism links transcriptional control to genome duplication fidelity and cell cycle regulation.