Correlation of Post-UV Colony-Forming Abilities of Xeroderma Pigmentosum Fibroblasts with DNA Incision Reactions Catalyzed by Cell-Free Extracts

  • Heinz Walter Thielmann
  • Adonis Georgiades
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 40)


Xeroderma pigmentosum is an autosomal recessive genodermatosis which is characterized by abnormal dryness, atrophy, pigmentation abnormalities, and early carcinomas of the skin if exposed to sunlight (1). Cultivated XP fibroblasts show lower levels of DNA excision repair after exposure to UV irradiation or UV-like carcinogens such as (Ac)2 ONFln. There are currently 7 excision repair-deficient forms, classified as complementation groups A-G (2), which suggests that several gene products are involved in excision repair of UV-damaged DNA. It seems generally accepted that XP cells of all complementation groups are defective at the level of DNA incision (2,3). However, our knowledge regarding the precise enzymic deficiency by which a particular complementation group is characterized is still incomplete.



Xeroderma pigmentosum



UV light

ultraviolet light

AP sites

apurinic/apyrimidinic sites.


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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • Heinz Walter Thielmann
    • 1
  • Adonis Georgiades
    • 1
  1. 1.Institute of BiochemistryGerman Cancer Research CenterHeidelbergGermany

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