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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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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Effects of base damages on DNA replication.

H Ide1, Y Kimura, A Murakami

  • 1Department of Polymer Science and Engineering, Faculty of Textile Science, KyotoInstitute of Technology, Matsugasaki, Sakyo-ku, Japan.

Nucleic Acids Symposium Series
|September 28, 2018
PubMed
Summary

DNA polymerase

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Cellular response to genotoxic agents is crucial for survival.
  • DNA polymerase interaction with damaged DNA templates determines cell fate.
  • Understanding these interactions is key to assessing lethal and mutagenic events.

Purpose of the Study:

  • To investigate DNA polymerase's response to thymine damages in DNA templates.
  • To evaluate the impact of different thymine damage structures on DNA synthesis.
  • To determine how DNA polymerase activity influences DNA repair and replication.

Main Methods:

  • In vitro DNA synthesis using M13 (or f1) DNA templates with four types of thymine damages.
  • Quantification of DNA synthesis inhibition via [3H] dTMP incorporation.

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  • Analysis of newly synthesized DNA on sequencing gels to identify DNA synthesis termination sites.

    • Main Results:

    • Differential inhibition of DNA synthesis was observed based on the type of thymine damage.
    • DNA synthesis termination sites were found to be dependent on the specific damage structures.
    • The 3'-5' exonuclease activity of the DNA polymerase significantly influenced termination site selection.

    Conclusions:

    • The structure of thymine DNA damage dictates the inhibitory effect on DNA synthesis.
    • DNA polymerase's exonuclease activity plays a critical role in navigating DNA lesions.
    • These findings provide insights into cellular mechanisms for handling genotoxic stress and DNA repair.