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NEIL1 Recoding due to RNA Editing Impacts Lesion-Specific Recognition and Excision.

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A-to-I RNA editing modifies the NEIL1 DNA repair enzyme, creating distinct isoforms. These isoforms show varied efficiency in removing different oxidative DNA lesions, impacting DNA repair pathways.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • A-to-I RNA editing is common in humans but rare in coding regions outside the nervous system.
  • The base excision DNA repair enzyme NEIL1 is unusually targeted for recoding by ADAR1.
  • This editing converts lysine to arginine in NEIL1's lesion recognition loop, altering its substrate specificity.

Purpose of the Study:

  • To investigate how A-to-I RNA editing affects NEIL1's DNA repair activity.
  • To understand the chemical and structural features influencing isoform-specific repair of oxidatively damaged DNA bases.

Main Methods:

  • Enzyme activity assays comparing unedited (UE) and edited (Ed) NEIL1 isoforms.
  • Evaluation of repair efficiency on various oxidatively modified DNA bases.
  • Gas-phase calculations to analyze base lesion properties.

Main Results:

  • UE NEIL1 shows higher activity against oxidized pyrimidines (e.g., thymine glycol, uracil glycol).
  • Ed NEIL1 is more efficient at removing 5-hydroxycytosine and guanidinohydantoin.
  • Excision rates correlate with base tautomer stability and proton affinity.

Conclusions:

  • NEIL1 editing creates functional isoforms with distinct substrate specificities.
  • Tautomerization and N3 protonation are key in NEIL1's catalytic mechanism for pyrimidine lesions.
  • Complex NEIL1 activity suggests roles in DNA repair and epigenetic regulation.