Addition of UV Endonuclease to Permeable XP Cells to Analyze the Relation of Poly(ADPR) Synthesis to DNA Repair

  • Nathan A. Berger
  • Georgina W. Sikorski
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 40)


Poly(adenosine diphosphoribose) is synthesized from NAD+ by poly(ADPR) polymerase, which is a tightly bound chromosomal enzyme whose activity is stimulated when cells are treated with various DNA-damaging agents.1–4 The rapid synthesis and degradation of ADP ribose polymers has the potential for causing drastic but reversible alterations in chromatin conformation. Since poly(ADPR) synthesis increases in response to DNA damage, it was proposed that poly(ADPR) might be involved in the DNA repair process, altering chromatin structure so as to make DNA-damaged regions more readily accessible to the enzymes of DNA repair.2–5 Part of this proposal has been confirmed by the demonstration that inhibitors of poly(ADPR) synthesis interfere with the ability of cells to recover and proliferate following DNA damage.6 In addition, cells made NAD+-deficient by nicotinamide starvation are unable to carry out unscheduled DNA synthesis after treatment with N-methyl-N'-nitro-N-nitroso-guanidine (MNNG); they are also unable to reseal DNA strand breaks after treatment with dimethyl sulfate.6,7


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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Nathan A. Berger
    • 1
  • Georgina W. Sikorski
    • 1
  1. 1.The Hematology/Oncology Division of the Department of MedicineWashington University School of Medicine at The Jewish Hospital of St. LouisSt. LouisUSA

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