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Xeroderma pigmentosum (XP) patients who lack the main damage recognition protein for global genome repair (GGR), XPC, have greatly increased skin cancer rates and elevated mutation frequencies originating from unrepaired ultraviolet photoproducts in the nontranscribed regions of the genome and in nontranscribed strands of expressed genes. But they show no increased mutations in transcribed strands...
Genome instability, defined as higher than normal rates of mutation, is a double-edged sword. As a source of genetic diversity and natural selection, mutations are beneficial for evolution. On the other hand, genomic instability can have catastrophic consequences for age-related diseases such as cancer. Mutations arise either from inactivation of DNA repair pathways or in a repair-competent background...
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