Ontology highlight
ABSTRACT:
PROVIDER: PRJNA487997 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR7757440.fastq.gz | Fastqsanger.gz | |||
| SRR7757441.fastq.gz | Fastqsanger.gz | |||
| SRR7757442.fastq.gz | Fastqsanger.gz | |||
| SRR7757443.fastq.gz | Fastqsanger.gz | |||
| SRR7757444.fastq.gz | Fastqsanger.gz |
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Similar Datasets
Project description:Elevated pyrimidine dimer formation at distinct genomic bases underlies promoter mutation hotspots in UV-exposed cancers
| PRJNA488607 | ENA
Project description:Sequencing of whole cancer genomes has revealed an abundance of recurrent mutations in gene-regulatory promoter regions, in particular in melanoma where strong mutation hotspots are observed adjacent to ETS-family transcription factor (TF) binding sites. While sometimes interpreted as functional driver events, these mutations are commonly believed to be due to locally inhibited DNA repair. Here, we first show that low-dose UV light induces mutations preferably at a known ETS promoter hotspot in cultured cells even in the absence of global or transcription-coupled nucleotide excision repair (NER). Further, by genome-wide mapping of cyclobutane pyrimidine dimers (CPDs) shortly after UV exposure and thus before DNA repair, we find that ETS-related mutation hotspots exhibit strong increases in CPD formation efficacy in a manner consistent with tumor mutation data at the single-base level. Analysis of a large whole genome cohort illustrates the widespread contribution of this effect to recurrent mutations in melanoma. While inhibited NER underlies a general increase in somatic mutation burden in regulatory elements including ETS sites, our data supports that elevated DNA damage formation at specific genomic bases is at the core of the prominent promoter mutation hotspots seen in skin cancers, thus explaining a key phenomenon in whole-genome cancer analyses.
2018-12-03 | GSE119249 | GEO
Project description:Noncoding mutation hotspots have been identified in melanoma and many of them occur at the binding sites of E26 transformation-specific (ETS) proteins; however, their formation mechanism and functional impacts are not fully understood. Here, we used UV damage sequencing data and analyzed cyclobutane pyrimidine dimer (CPD) formation, DNA repair, and CPD deamination in human cells at single-nucleotide resolution. Our data shows prominent CPD hotspots immediately after UV irradiation at ETS binding sites, particularly at sites with a conserved TTCCGG motif, which correlate with mutation hotspots identified in cutaneous melanoma. Additionally, CPDs are repaired slower at ETS binding sites than in flanking DNA. Cytosine deamination in CPDs to uracil is suggested as an important step for UV mutagenesis. However, we found that CPD deamination is significantly suppressed at ETS binding sites, particularly for the CPD hotspot on the 5’ side of the ETS motif, arguing against a role for CPD deamination in promoting ETS-associated UV mutations. Finally, we analyzed a subset of frequently mutated promoters, including the ribosomal protein genes RPL13A and RPS20, and found that mutations in the ETS motif can significantly reduce the promoter activity. Thus, our data identifies high UV damage and low repair, but not CPD deamination, as the main mechanism for ETS-associated mutations in melanoma and uncover new roles of often-overlooked mutation hotspots in perturbing gene transcription.
2023-12-01 | GSE235483 | GEO
Project description:Repair of UV damage from the transcribed strand (TS) of yeast genes is rapid due to the transcription coupled nucleotide excision repair (TC-NER) pathway. TC-NER is triggered when RNA polymerase stalls at UV damage, such as a UV-induced cyclobutane pyrimidine dimer (CPD). During transcription, the histone methyltransferase Set2 methylates histone H3K36, but it is not known if Set2 regulates TC-NER. Here, we report genome-wide repair maps of UV-induced cyclobutane pyrimidine dimers (CPDs) in yeast cells lacking Set2.
2022-02-21 | GSE179794 | GEO
Project description:We characterized the role of H3K36 methylation in regulating repair of UV damage from the transcribed strand (TS) of yeast genes by the transcription coupled nucleotide excision repair (TC-NER) pathway. TC-NER is triggered when RNA polymerase stalls at UV damage, such as a UV-induced cyclobutane pyrimidine dimer (CPD). During transcription, the histone methyltransferase Set2 methylates histone H3K36, but it is not known if H3K36 methylation regulates TC-NER. Here, we report genome-wide repair maps of UV-induced cyclobutane pyrimidine dimers (CPDs) in yeast cells containing mutants in histone H3K36 (or set2).
2022-02-21 | GSE194101 | GEO
Project description:Mutational signatures can reveal properties of underlying mutational processes and are important when assessing signals of selection in cancer. Here we describe the sequence characteristics of mutations induced by ultraviolet (UV) light, a major mutagen in several human cancers, in terms of extended (longer than trinucleotide) patterns as well as variability of the signature across chromatin states. Promoter regions display a distinct UV signature with reduced TCG>TTG transitions, and genome-wide mapping of UVB-induced DNA photoproducts (pyrimidine dimers) showed that this may be explained by decreased damage formation at hypomethylated promoter CpG sites. Further, an extended signature model encompassing additional information from longer contextual patterns improves modeling of UV mutations, which may enhance discrimination between drivers and passenger events. Our study presents a refined picture of the UV signature and underscores that the characteristics of a single mutational process may vary across the genome.
2019-09-11 | GSE127966 | GEO
Project description:The exposure of skin to ultraviolet (UV) radiation results in sunburn cell (SBC) and cyclobutane pyrimidine dimer (CPD) formation and local immune suppression. However, the pathways that regulate these events are poorly understood. Here, we exposed mice to UVB to study the early cytotoxic effects in absence of E3 ubiquitin protein ligase Cbl-b. We observed that Cbl-b-/- mice developed significantly less SBCs and CPDs compared to WT mice. In addition, microarray analysis revealed that loss of Cbl-b-induced cell tolerance genes rather than DNA repair genes. Taken together, our results suggest a novel role of Cbl-b in regulating UV cytotoxicity.
2018-08-15 | GSE79073 | GEO
Project description:Here, we used the cyclobutane pyrimidine dimer-sequencing (CPD-seq) method to map UV damage footprints associated with transcription factor binding to DNA in yeast. We analyzed CPD-seq data from UV-irradiated wild-type yeast cells that were immediately isolated and analyzed (0hr time point) and compared these data to isolated yeast genomic DNA that was UV-irradiated in vitro (naked DNA control). We analyze these data with a machine learning algorithm to identify binding sites of the Hap2/Hap3/Hap5 transcription factor complex across the yeast genome, based on their UV damage footprint. As a control, we UV-irradiated hap5 mutant cells, which renders the complex unable to bind DNA, and mapped UV damage patterns using CPD-seq.
2025-10-01 | GSE292650 | GEO
Project description:UV light is an initiating factor in the etiology of human melanoma due to its production of mutagenic DNA photoproducts, primarily cyclobutane pyrimidine dimers (CPDs) and 6-4 photoproducts. UV-induced mutations are heterogeneously distributed across melanoma genomes, being enriched, for example, in regions of compact heterochromatin and at active transcription factor binding sites (TFBS). Differential ability of nucleotide excision repair (NER) to remove UV-induced DNA lesions in these regions has been proposed as the primary factor establishing the observed regional differences in melanoma mutation density. However, it is not fully understood to what extent the binding of transcription factors and chromatin structure affect UV damage formation, nor how variations in initial damage levels contribute to mutagenesis. Here, we directly mapped sites of CPD formation across the genome in human cells, and show that variations in UV damage formation, due to primary chromatin structure and transcription factor binding, are strongly correlated with local differences in melanoma mutation density. Analysis of individual transcription factors revealed that the E26 transformation-specific (ETS) family is the major contributor to increased somatic mutation density at TFBS in melanoma, primarily because DNA binding by ETS family transcription factors stimulates the formation of CPD lesions, generating UV damage 'hotspots'. Moreover, many ETS binding sites, including those associated with known cancer genes, are recurrently mutated in human melanomas. These findings establish variable lesion formation as a key contributor to mutation heterogeneity in cancer.
2018-06-21 | GSE103487 | GEO
Project description:We used a high-throughput sequencing method known as CPD-seq to map the formation of UV-induced cyclobutane pyrimidine dimers (CPD) at single nucleotide resolution in UV-irradiated yeast genomic DNA (naked DNA) in the presence or absence of cytosine methylation at CpG sites by the methyltransferase M.SssI.
2023-08-15 | GSE235068 | GEO