DNA repair diseases
Monday 20 June 2005
Human genetic diseases can be caused by defective DNA repair mechanisms. This was first discovered by Cleaver (1968), who showed that cells from patients with xeroderma pigmentosum (XP) were defective for the ability to remove ultraviolet (UV)-induced lesions from their genome.
1. Nucleotide excision repair diseases (NER diseases)
Lesions that cause gross distortions on the DNA double helix, such as pyrimidine dimers induced by UV irradiation, are recognized and excised from DNA by a complex mechanism known as nucleotide excision repair.
Three human genetic disorders are associated with defects on nucleotide excision repair:
Human DNA repair diseases: From genome instability to cancer. Carlos R. Machado and Carlos F.M. Menck. Brazilian Journal of Genetics. ISSN 01008455