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Related Concept Videos

Proofreading01:31

Proofreading

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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Proofreading01:43

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Mismatch Repair01:36

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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
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Sanger Sequencing01:57

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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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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.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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Rare Event Detection Using Error-corrected DNA and RNA Sequencing
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Rare Event Detection Using Error-corrected DNA and RNA Sequencing

Published on: August 3, 2018

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Mapping DNA polymerase errors by single-molecule sequencing.

David F Lee1, Jenny Lu1, Seungwoo Chang2

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.

Nucleic Acids Research
|May 18, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel high-throughput sequencing assay for precisely mapping DNA polymerase errors at the single-molecule level. The method accurately quantifies error spectra and lesion bypass fidelity, advancing genomic integrity research.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Genomic integrity is crucial and threatened by DNA polymerase replication errors.
  • Quantifying DNA polymerase error spectra is difficult due to the rarity and detection challenges of errors.

Purpose of the Study:

  • To develop a high-throughput sequencing assay for mapping in vitro DNA replication errors at single-molecule resolution.
  • To overcome limitations of previous methods in detecting and quantifying polymerase errors across diverse template substrates.

Main Methods:

  • A novel high-throughput sequencing assay was developed to map DNA replication errors.
  • A barcoding strategy was employed to tag and amplify individual replication products, enabling error correction of sequencing reads.
  • The assay allows for base-resolution error detection without quantification bias.

Main Results:

  • The assay successfully mapped in vitro DNA replication errors at the single-molecule level.
  • It demonstrated the ability to characterize average error rates, identify error hotspots, and assess lesion bypass fidelity for various DNA polymerases.
  • The barcoding strategy effectively mitigated high-throughput sequencing errors.

Conclusions:

  • The developed assay provides a robust and unbiased method for characterizing DNA polymerase fidelity.
  • This advancement facilitates a deeper understanding of mutation processes and genomic instability.
  • The assay is applicable to any template substrate, offering broad utility in molecular biology research.