Abstract
Living organisms exposed to sunlight have developed mechanisms to repair the damage that UVR induces in their DNA. These DNA repair systems are present in most life forms including bacteria, yeast, rodents, and mammals. Three rare human genetic diseases have defects in the DNA repair system called nucleotide excision repair (NER). Patients with xeroderma pigmentosum (XP) have defective NER and a more than 10,000-fold increased frequency of skin cancer, whereas patients with Cockayne syndrome (CS) or with trichothiodystrophy (TTD) have NER defects without increase in cancer. These are strikingly different clinical phenotypes (Figure 1). The dramatic differences in their manifestations reflect the complexity of DNA repair and the broad scope and central role of DNA repair on preservation of diverse biological functions. This article will review the major milestones in our understanding of DNA repair and skin cancer (Table 1). These include recognition of the clinical diseases, understanding the types of damage sunlight causes in the DNA, recognition of DNA repair in different organisms, discovery of defective DNA repair in humans, cloning of multiple human DNA repair genes, and identification of UV-type mutations in skin cancer.
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