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Thymine dimer repair in fibroblasts of patients with dysplastic naevus syndrome (DNS)

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Summary

Dysplastic naevus syndrome (DNS) is frequently observed in association with familial melanoma and xeroderma pigmentosum (XP), but the role of UV-light in the development of DNS has not been elucidated. Previous work has shown that UV-induced unscheduled DNA synthesis is associated with the early loss of antigenicity observed in immunoassays using a monoclonal antibody specific for thymine-thymine dimers. We now show that the rate of loss of antigenicity, which reflects the relative amount of bound antibody, observed during the first 60 min following 10 Jm−2 UVC irradiation is significantly reduced (p=0.02) in cultures of fibroblasts from 7 out of 8 DNS patients compared with the results from cells of a group of 30 healthy volunteers. This observation suggests an early event in excision repair is altered in the majority of DNS patients.

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Roth, M., Boyle, J.M. & Müller, H. Thymine dimer repair in fibroblasts of patients with dysplastic naevus syndrome (DNS). Experientia 44, 169–171 (1988). https://doi.org/10.1007/BF01952205

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