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Updated: Jun 1, 2026

Roller Microneedle Combined with Tranexamic Acid Solution in Treating Melasma
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Published on: January 19, 2024

Mind the gap: keeping UV lesions in check.

Daniele Novarina1, Flavio Amara, Federico Lazzaro

  • 1Dipartimento di Scienze Biomolecolari e Biotecnologie, Università degli Studi di Milano. Via Celoria 26, 20133 Milano, Italy.

DNA Repair
|May 24, 2011
PubMed
Summary

Cells activate DNA damage checkpoints and repair pathways in response to genotoxic stress. Recent models show Nucleotide Excision Repair (NER) and exonucleolytic activities sequentially trigger checkpoints, especially when repair is inefficient.

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Last Updated: Jun 1, 2026

Roller Microneedle Combined with Tranexamic Acid Solution in Treating Melasma
04:12

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Published on: January 19, 2024

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cells possess surveillance mechanisms to detect and repair DNA damage.
  • DNA damage checkpoints and repair pathways are crucial for genomic stability.
  • The interplay between DNA repair and checkpoint activation is complex and cell cycle-dependent.

Purpose of the Study:

  • To elucidate the mechanisms of cellular response to UV-induced DNA lesions.
  • To model the sequential roles of Nucleotide Excision Repair (NER) and exonucleolytic activities in checkpoint activation.
  • To differentiate the cellular response to UV damage during different cell cycle phases.

Main Methods:

  • Review and synthesis of recent findings on DNA damage response pathways.
  • Modeling of sequential repair and checkpoint activation mechanisms.
  • Analysis of cell cycle-specific responses to UV lesions.

Main Results:

  • In non-replicating cells, sequential Nucleotide Excision Repair (NER) and exonucleolytic activities lead to checkpoint activation.
  • Problematic repair intermediates that are not efficiently resolved by NER are critical triggers.
  • In S phase, blocked replicative polymerases create single-stranded DNA (ssDNA) gaps downstream of UV lesions, activating checkpoint kinases if not repaired.

Conclusions:

  • The cellular response to UV damage involves a coordinated effort between repair and checkpoint pathways.
  • The nature of DNA damage intermediates and cell cycle phase dictate the checkpoint activation mechanism.
  • Efficient resolution of ssDNA gaps is critical for preventing checkpoint activation in S phase cells.