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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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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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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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DNA excision repair at telomeres.

Pingping Jia1, Chengtao Her2, Weihang Chai3

  • 1Elson S. Floyd College of Medicine, United States.

DNA Repair
|October 1, 2015
PubMed
Summary

DNA damage can cause genomic instability and cancer. Mammalian cells use DNA repair mechanisms, including base excision repair (BER), nucleotide excision repair (NER), and mismatch repair (MMR), to maintain telomere stability and prevent genome instability.

Keywords:
Base excision repairGenome stabilityMismatch repairNucleotide excision repairTelomere

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • DNA damage arises from internal cellular processes and external agents.
  • Unrepaired DNA damage can lead to genomic instability and cancer.
  • Mammalian cells possess conserved DNA repair mechanisms to preserve genomic integrity.

Purpose of the Study:

  • To review the role of excision repair pathways in telomere maintenance.
  • To focus on base excision repair (BER), nucleotide excision repair (NER), and mismatch repair (MMR) in telomeres.
  • To highlight current knowledge and identify research gaps in telomere DNA repair.

Main Methods:

  • Literature review of DNA repair pathways.
  • Focus on excision repair mechanisms (BER, NER, MMR).
  • Analysis of telomere maintenance and DNA damage.

Main Results:

  • Telomeres are susceptible to DNA damage due to their unique sequence.
  • Excision repair pathways are crucial for maintaining telomere integrity.
  • Specific roles of BER, NER, and MMR in telomere repair are discussed.

Conclusions:

  • Understanding DNA repair at telomeres is vital for preventing genome instability.
  • Further research is needed to fully elucidate excision repair processes at telomeres.
  • These repair mechanisms are critical for overall genome stability and cancer prevention.