Cited by 95DNA Repair MechanismsCarcinogens and Genotoxicity AssessmentSkin Protection and Aging

Genomic sites hypersensitive to ultraviolet radiation

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Premi, Sanjay, Han, Lynn, Mehta, Sameet, Knight, James, Zhao, Dejian, Palmatier, Meg A., Kornacker, Karl, Brash, Douglas E.·2019·Proceedings of the National Academy of Sciences

Abstract

If the genome contains outlier sequences extraordinarily sensitive to environmental agents, these would be sentinels for monitoring personal carcinogen exposure and might drive direct changes in cell physiology rather than acting through rare mutations. New methods, adductSeq and freqSeq, provided statistical resolution to quantify rare lesions at single-base resolution across the genome. Primary human melanocytes, but not fibroblasts, carried spontaneous apurinic sites and TG sequence lesions more frequent than ultraviolet (UV)-induced cyclobutane pyrimidine dimers (CPDs). UV exposure revealed hyperhotspots acquiring CPDs up to 170-fold more frequently than the genomic average; these sites were more prevalent in melanocytes. Hyperhotspots were disproportionately located near genes, particularly for RNA-binding proteins, with the most-recurrent hyperhotspots at a fixed position within 2 motifs. One motif occurs at ETS family transcription factor binding sites, known to be UV targets and now shown to be among the most sensitive in the genome, and at sites of mTOR/5′ terminal oligopyrimidine-tract translation regulation. The second occurs at A 2–15 TTCTY, which developed “dark CPDs” long after UV exposure, repaired CPDs slowly, and had accumulated CPDs prior to the experiment. Motif locations active as hyperhotspots differed between cell types. Melanocyte CPD hyperhotspots aligned precisely with recurrent UV signature mutations in individual gene promoters of melanomas and with known cancer drivers. At sunburn levels of UV exposure, every cell would have a hyperhotspot CPD in each of the ∼20 targeted cell pathways, letting hyperhotspots act as epigenetic marks that create phenome instability; high prevalence favors cooccurring mutations, which would allow tumor evolution to use weak drivers.

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  • A study of CPD hyperhotspots found a DNA sequence motif specific to melanocytes at which CPDs were present before the experiment began and at which dCPDs appeared over time and were poorly repaired, as if generated by melanogenesis during prior cell culture.

    “a study of “CPD hyperhotspots”, sites at which UVB or UVC induces CPDs more than 100-fold more frequently than the genomic average, encountered a DNA sequence motif specific to melanocytes at which CPDs were present before the experiment began and at which dCPDs appeared over time and were poorly repaired, as if dCPDs had been generated by melanogenesis during prior cell culture”

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  1. [27]27. S. Premi et al., AdductSeq data for "Genomic sites hypersensitive to ultraviolet ra- diation." Gene Expression Omnibus. https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi? acc=GSE137226. Deposited 10 September 2019.

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Authors
Premi, S., Han, L., Mehta, S., Knight, J., Zhao, D., Palmatier, M. A., Kornacker, K., & Brash, D. E.
Affiliations
  • Yale University (US)
  • Karl Kornacker & Associates, LLC, Worthington, OH 43085;
  • Yale Cancer Center (US)
Venue
Proceedings of the National Academy of Sciences
Published
2019-11-13
Volume
116
Issue
48
Pages
24196-24205
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2983095819
Cited by
95
References
76
Citations by year
2026: 8 · 2025: 8 · 2024: 13 · 2023: 24 · 2022: 15 · 2021: 12 · 2020: 12 · 2019: 3
FWCI
3.47
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • HHS | NIH | National Cancer Institute (P50CA121974, 2P30CA016359-34)
  • HHS | NIH | National Institute of Environmental Health Sciences (1R01ES030562)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
  • Health Sciences › Medicine › Dermatology › Skin Protection and Aging
Keywords
ultraviolet radiation, cyclobutane pyrimidine dimers, DNA adducts, melanocytes, melanoma, DNA repair, RNA-binding proteins, tumor evolution
MeSH terms
Cells, Cultured, DNA Damage, Fibroblasts, Gene Expression Regulation, Humans, Melanocytes, Melanoma, Mutation, Promoter Regions, Genetic, Pyrimidine Dimers, Pyrimidine Nucleotides, Skin Neoplasms, Protein Biosynthesis, Ultraviolet Rays, Genome, Human, 5' Untranslated Regions, TOR Serine-Threonine Kinases, High-Throughput Nucleotide Sequencing

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