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Researchers developed synthetic nucleosides to detect DNA adducts, enabling colorimetric identification of damage and amplification of alkylated DNA for disease risk assessment.

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Area of Science:

  • Chemical Biology
  • Molecular Biology
  • Synthetic Chemistry

Background:

  • Chemical damage to DNA, particularly O6-alkylguanine (O6-alkylG) adducts, disrupts genetic code reading and can initiate carcinogenesis.
  • The low abundance of these adducts limits understanding of their biological impact and disease risk.
  • Novel tools are critically needed to detect and study the biological role of DNA alkylation adducts.

Purpose of the Study:

  • To create and apply synthetic nucleosides for detecting and studying DNA adducts.
  • To develop methods for visualizing and quantifying DNA damage.
  • To understand the mechanistic role of DNA adducts in polymerase activity and DNA repair.

Main Methods:

  • Synthesis of nucleosides with altered structures to complement O6-alkylG adducts.
  • Utilizing synthetic nucleosides to stabilize damaged DNA templates for detection.
  • Developing gold nanoparticle-based colorimetric assays for distinguishing damaged DNA.
  • Employing synthetic nucleosides as mechanistic probes for DNA polymerase bypass studies.
  • Engineering a polymerase and synthetic triphosphate for amplifying alkylated DNA.

Main Results:

  • Developed synthetic nucleosides, including the perimidinone-derived nucleoside Per, that specifically stabilize O6-alkylG adducts in DNA duplexes.
  • Established structure-stability relationships for adduct-containing DNA duplexes.
  • Created a colorimetric detection strategy using gold nanoparticles to differentiate damaged from undamaged DNA.
  • Demonstrated that synthetic nucleosides can elucidate chemical determinants influencing DNA polymerase bypass efficiency and fidelity.
  • Achieved the first amplification of alkylated DNA using an engineered polymerase and synthetic triphosphate, enabling sensitive detection of DNA damage.

Conclusions:

  • Adduct-directed synthetic nucleosides offer novel strategies for interrogating DNA alkylation.
  • These tools facilitate the study of DNA adducts' levels, locations, and biological consequences.
  • The developed methods enable sensitive detection and characterization of DNA damage, aiding in understanding disease initiation and risk assessment.