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Related Experiment Videos

Bowhead NEIL1: molecular cloning, characterization, and enzymatic properties.

Signe Holm1, Rikke Møller Larsen1, Camilla Myrup Holst1

  • 1Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, DK-8000, Aarhus C, Denmark.

Biochimie
|November 5, 2022
PubMed
Summary

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Bowhead whale Nei Like DNA Glycosylase 1 (NEIL1) shows similar DNA repair activity to humans, not supporting the cancer resistance hypothesis. Further research is needed to explore NEIL1

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Nei Like DNA Glycosylase 1 (NEIL1) is crucial for repairing oxidative DNA damage via base excision repair.
  • NEIL1 removes oxidized pyrimidines caused by endogenous or exogenous agents.
  • NEIL1 possesses both glycosylase and AP-lyase activities for DNA backbone cleavage.

Purpose of the Study:

  • To investigate if enhanced NEIL1 activity or upregulation contributes to the cancer resistance observed in bowhead whales.
  • To characterize bowhead whale NEIL1, including its transcript variants and enzymatic function.

Main Methods:

  • Molecular cloning and characterization of bowhead whale NEIL1 transcript variants.
  • Differential expression analysis of NEIL1 mRNA in various bowhead whale tissues.
Keywords:
AgingBase excision repairBowheadNEIL1RNA editing

Related Experiment Videos

  • Investigation of A-to-I RNA editing in bowhead whale NEIL1.
  • Mass spectrometry to detect potential RNA editing-derived isoforms.
  • Expression and enzymatic activity assays of recombinant bowhead and human NEIL1.

    • Main Results:

    • Three bowhead whale NEIL1 transcript variants were identified, two homologous to human and one novel.
    • Differential NEIL1 mRNA expression was observed across bowhead whale tissues.
    • Conserved A-to-I editing occurred in the bowhead whale NEIL1, but no editing-derived isoform was detected via mass spectrometry.
    • Recombinant bowhead and human NEIL1 exhibited similar efficiency in removing 5-hydroxyuracil DNA lesions.

    Conclusions:

    • The study's findings do not support the hypothesis that increased NEIL1 activity or expression confers cancer resistance in bowhead whales.
    • The enzymatic activity of bowhead whale NEIL1 is comparable to human NEIL1.
    • While the hypothesis is not supported, it is not entirely refuted, suggesting other DNA repair mechanisms may be involved.