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Related Concept Videos

Replication in Eukaryotes01:29

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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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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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G2-seq: A High Throughput Sequencing-based Technique for Identifying Late Replicating Regions of the Genome
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Distinct and sequential re-replication barriers ensure precise genome duplication.

Yizhuo Zhou1, Pedro N Pozo2, Seeun Oh3

  • 1Department of Biochemistry and Biophysics, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United State of America.

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|August 26, 2020
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Summary
This summary is machine-generated.

Precise genome duplication is ensured by preventing DNA re-replication. This study reveals a new mechanism where Cdt1 hyperphosphorylation by Cyclin A/CDK1 inhibits MCM re-loading in G2 phase, ensuring replication occurs only once.

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Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Genomics

Background:

  • Accurate genome duplication requires preventing DNA re-replication.
  • Multiple mechanisms inhibit origin licensing after S phase begins.
  • Temporal relationships of these mechanisms, especially in G2/M phases, are unclear.

Purpose of the Study:

  • To identify novel mechanisms preventing DNA re-replication in human cells.
  • To elucidate the role of Cdt1 phosphorylation in regulating MCM helicase loading.
  • To define the temporal control of replication licensing inhibition through cell cycle phases.

Main Methods:

  • Utilized mutagenesis and biochemical assays.
  • Employed single-cell analyses in human cell lines.
  • Investigated Cdt1 phosphorylation and its interaction with MCM complexes.

Main Results:

  • Discovered Cdt1 hyperphosphorylation as a novel re-replication prevention mechanism.
  • Demonstrated Cyclin A/CDK1 phosphorylates Cdt1, inhibiting MCM re-loading in G2 phase.
  • Showed Cdt1 dephosphorylation at mitosis-to-G1 transition reactivates Cdt1 for subsequent cell cycles.

Conclusions:

  • A sequential relay of distinct licensing inhibition mechanisms ensures precise genome duplication.
  • Cdt1 hyperphosphorylation by Cyclin A/CDK1 acts as a critical G2 phase checkpoint.
  • Understanding these mechanisms is vital for comprehending cell cycle fidelity and preventing genomic instability.