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Related Concept Videos

Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Related Experiment Video

Updated: May 9, 2025

Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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Do Ternary DNA-Cr(III)-Small Molecule Adducts Form?

Sydney Marchi1, Katie Repke1, Gracie Sunde1

  • 1Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, AL, 35487-0336, USA.

Biological Trace Element Research
|May 1, 2025
PubMed
Summary

Ternary DNA-chromium adducts, implicated in cancer, may not form biologically. Studies suggest DNA-small molecule adducts are organic, not involving chromium(III).

Keywords:
AscorbateCancerChromiumDNAGlutathioneTernary adducts

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Area of Science:

  • Environmental Science
  • Biochemistry
  • Molecular Biology

Background:

  • Chromium(VI) complexes are linked to cancer and mutations.
  • This is thought to occur via ternary DNA-Cr(III)-small molecule adducts.
  • Direct characterization of these ternary adducts is lacking.

Purpose of the Study:

  • To investigate the formation and structure of DNA-Cr(III)-small molecule adducts.
  • To determine if ternary adducts form under biologically relevant conditions.
  • To elucidate the molecular mechanisms of chromium-induced DNA damage.

Main Methods:

  • Attempted synthesis of ternary DNA-Cr(III)-small molecule adducts using various reducing agents (ascorbate, cysteine, glutathione, dithiothreitol, NADH).
  • Spectroscopic techniques were employed for characterization (though not explicitly detailed, implied by the abstract).
  • Analysis of Cr(III)-guanine interactions and hydrogen bonding in binary adducts.

Main Results:

  • Despite extensive efforts, ternary DNA-Cr(III)-small molecule adducts could not be generated or characterized.
  • Analysis suggests Cr(III) interaction with guanine and hydrogen bonding are key in binary adduct formation.
  • The formation of ternary adducts under biological conditions appears unlikely.

Conclusions:

  • Ternary DNA-Cr(III)-small molecule adducts may not form in vivo.
  • Existing DNA-small molecule adducts in chromium toxicity might be solely organic.
  • This challenges current models of chromium carcinogenesis and mutagenicity.