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Related Concept Videos

The Replisome03:01

The Replisome

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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.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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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.
Many Proteins Work Together to Replicate the Chromosome
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Coordination of Gene Expression Processes in Bacteria01:29

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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Translesion DNA Polymerases02:10

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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DNA Bacteriophages01:26

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Visualizing Single-molecule DNA Replication with Fluorescence Microscopy
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Speed variations of bacterial replisomes.

Deepak Bhat1,2, Samuel Hauf3, Charles Plessy4

  • 1Biological Complexity Unit, Okinawa Institute of Science and Technology, Onna, Japan.

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|July 25, 2022
PubMed
Summary

Researchers developed a new method to study DNA replication dynamics in bacteria. This technique revealed how replisome speed changes with temperature and along the genome in Escherichia coli.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Replisomes are essential multi-protein complexes responsible for genome replication.
  • Understanding the in vivo dynamics of replisomes is crucial but remains challenging.

Purpose of the Study:

  • To develop a novel method for inferring replisome dynamics from DNA abundance distributions.
  • To investigate the impact of temperature on replisome speed in Escherichia coli.
  • To explore variations in replisome speed along the genome.

Main Methods:

  • Measuring DNA abundance distribution in growing bacterial populations using deep sequencing.
  • Developing computational approaches to infer replisome speed from DNA abundance data.
  • Experimentally analyzing Escherichia coli populations at different growth temperatures.

Main Results:

  • The average replisome speed in Escherichia coli increases significantly with temperature (nearly fivefold from 17 °C to 37 °C).
  • Wave-like variations in replisome speed were observed along the genome.
  • These speed variations correlate with known variations in mutation rates, suggesting a shared underlying mechanism.

Conclusions:

  • The developed method allows sensitive detection of replisome speed variations in vivo.
  • Replication dynamics are temperature-dependent and exhibit spatial heterogeneity across the genome in E. coli.
  • The findings suggest a link between replication dynamics and mutation rate variations, opening avenues for studying bacterial mutants and other species.