Role of Cellular Systems in Modifying the Response to Chemical Mutagens

  • B. Strauss
  • K. N. Ayres
  • K. Bose
  • P. Moore
  • R. Sklar
  • K. Tatsumi
Part of the Basic Life Sciences book series (BLSC, volume 15)


Neocarzinostatin (NCS) produces apurinic/apyrimidinic (AP) sites in DNA which are repaired by the AP excision repair system. Survival after NCS treatment is not determined exclusively by this repair system, presumably because of the production of other, lethal, lesions. MNNG also produces multiple lesions which may be handled by cells in different ways. In E. coli, MNNG treatment results in rapid induction of a system which removes O6-methylguanine. Inhibition of this induction with chloramphenicol results in a large increase in mutation frequency. Induction of an enzyme which removes O6-methylguanine probably accounts for the enrichment of mutations near DNA growing points. MNNG also induces multiple closely linked mutations. The production of multiple mutations but not of single-site mutations is blocked in rec A and uvr E strains. The exact nucleotide site at which DNA synthesis is blocked in vitro by reaction with mutagens can be observed in a øX174 system in which the nucleotide sequence is known. DNA polymerase I catalyzed synthesis is blocked one nucleotide before the reacted base on the template strand. In contrast, with some damaged templates, AMV reverse transcriptase can insert a base at the level of the reacted nucleotide on the template.


Xeroderma Pigmentosum Repair Synthesis Single Site Mutation Dose Reduction Factor MNNG Treatment 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • B. Strauss
    • 1
  • K. N. Ayres
    • 1
  • K. Bose
    • 1
  • P. Moore
    • 1
  • R. Sklar
    • 1
  • K. Tatsumi
    • 1
  1. 1.Department of MicrobiologyThe University of ChicagoChicagoUSA

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