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Related Concept Videos

Replication in Eukaryotes01:29

Replication in Eukaryotes

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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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Telomeres and Telomerase02:41

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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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The Replisome03:01

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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DNA Replication02:40

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...
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Replication in Prokaryotes01:32

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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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Chromosome Replication02:31

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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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Updated: Jun 10, 2025

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How to write an ending: Telomere replication as a multistep process.

Max E Douglas1

  • 1Telomere Biology Laboratory, The Institute of Cancer Research, 237 Fulham Road, London SW3 6JB, UK.

DNA Repair
|October 19, 2024
PubMed
Summary
This summary is machine-generated.

Telomeres, protective caps on eukaryotic chromosomes, are maintained by a complex replication process involving the eukaryotic replisome. This review details the mechanistic steps and coordination required for telomere replication and 3' overhang generation.

Keywords:
Chromosome BiologyDNA replicationDNA resectionTelomere

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Telomeres are essential nucleoprotein structures protecting eukaryotic chromosome ends.
  • Maintaining telomere length is critical for chromosomal stability and cell proliferation.

Purpose of the Study:

  • To review the mechanistic details of telomere replication.
  • To explore the coordination of individual steps in telomere maintenance.

Main Methods:

  • Literature review of telomere replication mechanisms.
  • Analysis of the eukaryotic replisome's role in navigating repetitive telomeric DNA.
  • Examination of protein interactions and regulatory factors.

Main Results:

  • Telomere replication involves navigating a complex repetitive template.
  • A 5' resection step generates a crucial 3' overhang.
  • Coordination between replisome progression and protein binding is vital.

Conclusions:

  • Understanding telomere replication mechanics is key to comprehending chromosomal stability.
  • The intricate coordination of telomere replication ensures proper chromosome end protection.
  • Further research into these mechanisms can illuminate aging and cancer biology.