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Related Experiment Videos

Monofunctional alkylating agent-induced S-phase-dependent DNA damage.

J L Schwartz1

  • 1Department of Radiation and Cellular Oncology, University of Chicago, IL 60637.

Mutation Research
|April 1, 1989
PubMed
Summary

Alkylating agents cause DNA damage during replication. This study shows that DNA strand breaks arise from incomplete replication of alkylated DNA templates, likely due to lesions like 3-methyladenine.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Toxicology

Background:

  • Alkylating agents induce chromosome aberrations only after DNA replication.
  • DNA gaps from misreplication are implicated in aberration formation, but specific DNA lesions remain unidentified.

Purpose of the Study:

  • Quantify DNA strand break induction during replication of alkylated DNA.
  • Identify specific alkylated DNA lesions responsible for S-phase-dependent strand breakage.

Main Methods:

  • Chinese hamster ovary (CHO) cells were treated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) or methyl methanesulfonate (MMS) in G1 phase.
  • Cells were labeled with [14C]thymidine and then progressed through S phase with [3H]thymidine.
  • DNA strand breaks were analyzed at mitosis.

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Main Results:

  • S-phase-dependent DNA strand breaks occurred in the newly synthesized ([3H]thymidine-labeled) DNA strand.
  • Breaks likely resulted from incomplete replication of alkylated templates, forming DNA gaps.
  • 3-methyladenine may cause replication failure and subsequent breaks.

Conclusions:

  • Replication of alkylated DNA templates generates DNA gaps and strand breaks.
  • Lesions such as 3-methyladenine and potentially O6-methylguanine contribute to S-phase-dependent DNA breakage.