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Related Experiment Videos

Triplex targeted genomic crosslinks enter separable deletion and base substitution pathways.

Sally Richards1, Su-Ting Liu, Alokes Majumdar

  • 1Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, 5600 Nathan Shock Dr, Baltimore, MD 21224, USA.

Nucleic Acids Research
|September 28, 2005
PubMed
Summary

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Triple helix forming oligonucleotides (TFOs) create targeted psoralen (pso) crosslinks, leading to mutations. DNA repair pathways, particularly nucleotide excision repair (NER), influence whether these crosslinks cause base substitutions or deletions.

Area of Science:

  • Molecular Biology
  • Genetics
  • DNA Repair Mechanisms

Background:

  • Triple helix forming oligonucleotides (TFOs) can be engineered to target specific DNA sequences.
  • Psoralen (pso) crosslinks are DNA adducts that can be introduced site-specifically using TFOs.
  • Understanding the cellular response to targeted DNA damage is crucial for therapeutic applications.

Purpose of the Study:

  • To investigate the mutagenic outcomes of site-specific psoralen (pso) interstrand crosslinks induced by TFOs in mammalian cells.
  • To identify the DNA repair pathways involved in processing these targeted crosslinks.
  • To determine if specific repair deficiencies alter mutation patterns.

Main Methods:

  • Synthesis of psoralen-conjugated TFOs for site-specific DNA crosslinking.

Related Experiment Videos

  • Introduction of pso-TFOs into mammalian cells with varying DNA repair proficiencies.
  • Analysis of mutation types (base substitutions and deletions) at the targeted genomic site.
  • Assessment of the roles of non-homologous end joining, mismatch repair, nucleotide excision repair (NER), and transcription-coupled repair (TCR) pathways.

    • Main Results:

    • Mutagenesis of pso-TFO crosslinks resulted in both base substitutions and deletions.
    • Deficiencies in non-homologous end joining and mismatch repair did not affect mutation patterns.
    • Base substitution frequency was dependent on ERCC1/XPF and polymerase zeta activity.
    • Deletion frequency increased in NER/TCR deficient cells, suggesting these pathways normally prevent deletions.

    Conclusions:

    • Targeted psoralen-TFO crosslinks can be processed through distinct mutagenic pathways leading to either base substitutions or deletions.
    • Nucleotide excision repair (NER) and transcription-coupled repair (TCR) pathways play a role in mitigating deletion formation from pso-TFO crosslinks.
    • The findings provide insights into the cellular metabolism of interstrand crosslinks and the development of TFO-based therapeutic strategies.