Ultraviolet-damaged DNA (UV-DNA) (UV-DNA)

Ultraviolet-damaged DNA consists of molecular lesions in the genomic structure caused by the absorption of UV photons, primarily resulting in cyclobutane pyrimidine dimers (CPDs) and 6-4 photoproducts (6-4PPs) (NIH, 2023). These structural distortions interfere with essential cellular processes such as DNA replication and transcription, potentially leading to permanent mutations if the cell's repair machinery is bypassed (PubMed, 2021). The primary human defense against such damage is the nucleotide excision repair (NER) pathway, and its failure is a hallmark of diseases like Xeroderma pigmentosum and various skin cancers (StatPearls, 2023). In a therapeutic context, UV-damaged DNA is the target of exogenous repair enzymes like T4 endonuclease V and photolyases, which are delivered topically to enhance the rate of lesion removal (Journal of Investigative Dermatology, 2020). By reducing the persistence of these lesions, these treatments aim to prevent the progression of actinic keratosis to squamous cell carcinoma and mitigate the effects of photoaging.

Other names

UV-induced DNA lesionsCyclobutane pyrimidine dimersCPDs6-4 photoproducts6-4PPsDNA photolesionsSolar-damaged DNA

Therapeutic strategies involve the enzymatic repair of lesions through nucleotide excision repair (NER) or direct reversal by photolyases, as well as the prevention of lesion formation using UV-absorbing or reflecting agents (PubMed, 2021; NIH, 2023).