Sister-Chromated Exchanges as a Measure of Damage Produced by Visible Light on BrdUrd-Substituted Chromosomes

  • C. Gutiérrez
  • J. B. Schvartzman
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 40)


We have studied the effect of visible light irradiation on BrdUrd-substituted chromosomes in Allium cepa L. meristem cells by measuring the yields of SCEs. The efficiency of this treatment in provoking SCEs is clearly dependent on the cell cycle time in which damage occurs, having obtained the highest frequencies when VL exposure coincides with the initiation of the S phase. Nitrogen atmosphere during irradiation reduces SCE frequencies, suggesting that some oxidizing radical species could be involved in the chemical reactions producing lesions that ultimately lead to SCE formation. These results are discussed with respect to the hypothesis that SCEs arise as a consequence of the passage of a damaged DNA through the replication process.



sister-chromatid exchanges




visible light




fluorescence plus Giemsa


xeroderma pigmentosum


Chinese hamster ovary


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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • C. Gutiérrez
    • 1
  • J. B. Schvartzman
    • 1
  1. 1.Instituto de Biologia CelularMadrid-6Spain

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