Modulation of UV damage formation and repair in nucleosomes in distinct chromatin states in Drosophila
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ABSTRACT:
PROVIDER: PRJNA1109412 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR28972941.fastq.gz | Fastqsanger.gz | |||
| SRR28972942.fastq.gz | Fastqsanger.gz | |||
| SRR28972943.fastq.gz | Fastqsanger.gz | |||
| SRR28972944.fastq.gz | Fastqsanger.gz | |||
| SRR28972945.fastq.gz | Fastqsanger.gz |
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Project description:Here, we describe a new genome-wide map of UV-induced cyclobutane pyrimidine dimers (CPDs) in Drosophila S2 cells and a naked DNA control using CPD-seq. We used this data to analyze CPD formation in nucleosomes and different chromatin states across the Drosophila genome. We analyzed CPD formation alongside existing excision repair-sequencing (XR-seq) data to compare CPD damage and repair rates in five distinct chromatin types in Drosophila. This analysis revealed that CPD repair varied in different chromatin domains, while CPD formation was largely unaffected. Moreover, we observed distinct patterns of repair activity in nucleosomes in different chromatin types.
2024-12-03 | GSE267055 | GEO
Project description:UV-induced DNA lesions are an important contributor to mutagenesis and cancer, but it is not fully understood how the chromosomal landscape influences UV lesion formation and repair. We have used a novel high-throughput sequencing method to precisely map UV-induced cyclobutane pyrimidine dimers (CPDs) at nucleotide resolution throughout the yeast genome. Analysis of CPD formation reveals that nucleosomal DNA having an inward rotational setting is protected from CPD lesions. In strongly positioned nucleosomes, this nucleosome 'photofootprint' overrides intrinsic dipyrimidine sequence preferences for CPD formation. CPD formation is also inhibited by DNA-bound transcription factors, in effect protecting important DNA elements from UV damage. Analysis of CPD repair revealed a clear signature of efficient transcription-coupled nucleotide excision repair. Repair was less efficient at translational positions near a nucleosome dyad and at heterochromatic regions in the yeast genome. These findings define the roles of nucleosomes and transcription factors in UV damage formation and repair. UV mapping data was analyzed for yeast cells irradiated with 125J/m2 and allowed to repair for 0hr (2 samples), 20 minutes, 1 hour, or 2 hours. Data is also included for naked DNA irradiated with UV 60 or 90 J/m2
2016-08-19 | E-GEOD-79977 | biostudies-arrayexpress
Project description:UV-induced DNA lesions are an important contributor to mutagenesis and cancer, but it is not fully understood how the chromosomal landscape influences UV lesion formation and repair. We have used a novel high-throughput sequencing method to precisely map UV-induced cyclobutane pyrimidine dimers (CPDs) at nucleotide resolution throughout the yeast genome. Analysis of CPD formation reveals that nucleosomal DNA having an inward rotational setting is protected from CPD lesions. In strongly positioned nucleosomes, this nucleosome 'photofootprint' overrides intrinsic dipyrimidine sequence preferences for CPD formation. CPD formation is also inhibited by DNA-bound transcription factors, in effect protecting important DNA elements from UV damage. Analysis of CPD repair revealed a clear signature of efficient transcription-coupled nucleotide excision repair. Repair was less efficient at translational positions near a nucleosome dyad and at heterochromatic regions in the yeast genome. These findings define the roles of nucleosomes and transcription factors in UV damage formation and repair.
2016-08-19 | GSE79977 | GEO
Project description:Here, we describe a genome-wide map of photoreactivation repair of UV-induced cyclobutane pyrimidine dimers (CPDs) in yeast (Saccharomyces cerevisiae) by the endogenous yeast CPD photolyase. CPDs were mapped at single nucleotide resolution across the yeast genome using the CPD-seq method immediately after UV radiation (0min) and following 30 or 60min photoreactivation with UVA light. Photoreactivation repair by photolyase was mapped in both wild-type yeast and rad14∆ cells deficient in nucleotide excision repair (NER). We used these data to analyze CPD repair by photolyase in yeast genes, nucleosomes, and transcription factor binding sites.
2025-04-26 | GSE280082 | GEO
Project description:Background: Repair of DNA damage requires chromatin remodeling to permit removal of the lesions. How nucleosomes are remodelled to initiate repair of DNA damage remains largely unknown. Here, we describe how chromatin is altered during repair of UV-induced DNA damage at the level of the linear organisation of nucleosomes. Results: Using MNase-seq, we identified a subset of nucleosomes in the genome that are remodelled in UV-damaged wild-type yeast cells. We mapped the genomic location of these nucleosomes, showing that they contain the histone variant H2A.Z. The remodelling observed is consistent with histone exchange or eviction at these positions. This depends on the yeast SWI/SNF global genome nucleotide excision repair (GG-NER) chromatin-remodelling complex. Remarkably, we found that in the absence of DNA damage, the GG-NER complex occupies chromatin at nucleosome free regions separating adjacent nucleosomes. This establishes the nucleosome structure at these genomic locations, which we refer to as GG-NER complex binding sites (GCBS’s). We observed that these sites are frequently located precisely at certain boundary regions that delineate chromasomally interacting domains (CIDs). These boundaries define chromosomal domains of higher-order nucleosome-nucleosome interaction. We demonstrate that the GG-NER complex redistributes following remodelling of these nucleosomes after DNA damage taking up genomic positions located within the CIDs. This permits the efficient removal of DNA damage at these sites. Conclusions: We argue that organising DNA repair in the genome as described may define origins of DNA repair that greatly reduces the genomic search space for DNA damage recognition, thus ensuring the efficient repair of damage in chromatin.
2018-12-06 | E-MTAB-6569 | biostudies-arrayexpress
Project description:Rad16 is required for global genomic nucleotide excision repair (GG-NER) of UV-induced CPD lesions. Here we have used a novel high-throughput sequencing method known as CPD-seq to map the repair of UV-induced cyclobutane pyrimidine dimers (CPDs) at single nucleotide resolution across the yeast genome in rad16 mutant cells. Analysis of CPD repair indicates that rad16 is generally required for CPD repair in the non-transcribed strand (NTS) of yeast genes and non-transcribed genomic regions.
2019-11-27 | GSE131101 | GEO
Project description:UV-induced DNA damage is the major carcinogen of skin cancer. We developed HS-Damage-seq to map UV damage with unprecedented sensitivity and resolution in human cells. While the distribution of UV-induced damage are mainly determined by sequence context and essentially uniform throughout the genome, transcription factors can affect damage formation at specific positions. With time-course experiments, we observed changes in damage distribution at particular genomic loci and chromatin states, which reflects the nucleotide excision repair preferences and complements the repair maps by XR-seq. Our results demonstrated that while initial damage is uniformly distributed, they are heterogeneously repaired throughout the genome. The combination of damage and repair maps provides a holistic perspective of UV damage and repair in the human genome.
2017-06-27 | GSE98025 | GEO
Project description:We recently developed high-throughput sequencing approaches, eXcision Repair sequencing (XR-seq) and Damage-seq, to generate genome-wide mapping of DNA damage formation and excision repair, respectively, with single-nucleotide resolution. Here, we adopted time-course XR-seq data to profile UV-induced excision repair dynamics, paired with Damage-seq data to quantify the overall induced DNA damage. We identified genome-wide repair hotspots that are subject to exemplified amount of repair very soon after UV irradiation. We show that such repair hotspots do not result from hypersensitivity to DNA damage and are thus not damage hotspots. We find that the earliest repair occur preferentially in promoters and enhancers from open-chromatin regions. The repair hotspots are also significantly enriched for frequently interacting regions and super-enhancers, both of which are hotspots for local chromatin interactions. We further extend the interrogation of chromatin organization to DNA replication timing and conclude that early-repair hotspots are enriched for early-replication domains. Collectively, we report genome-wide early-repair hotspots of UV-induced damage, in association with chromatin states and epigenetic compartmentalization of the human genome.
2020-04-09 | GSE148303 | GEO
Project description:Exposure to ultraviolet (UV) light causes the formation of mutagenic cyclobutane pyrimidine dimers (CPDs) in cellular DNA. Previous studies have revealed that CPD formation in nucleosomes, the building blocks of chromatin, shows a striking ∼10 base pair (bp) periodic pattern. CPD formation is suppressed at positions where the DNA minor groove faces toward the histone octamer (minor-in) and elevated CPD formation at positions where the minor groove faces away from the histone octamer (minor-out). However, the molecular mechanism underlying this nucleosome photofootprint is unclear. Here, we analyzed ∼180 high-resolution nucleosome structures to characterize whether differences in DNA mobility or conformation are responsible for the CPD modulation in nucleosomes. Our results indicate that differences in DNA mobility cannot explain CPD modulation in nucleosome. Instead, we find that the sharp DNA bending around the histone octamer results in DNA conformations with structural parameters more susceptible to UV damage formation at minor-out positions and more resistant to CPD formation at minor-in positions. This analysis reveals the molecular mechanism responsible for periodic modulation of CPD formation and UV mutagenesis in nucleosomal DNA.
| S-EPMC9529667 | biostudies-literature
Project description:We have adapted the eXcision Repair-sequencing (XR-seq) method to generate single-nucleotide resolution dynamic repair maps of UV-induced cyclobutane pyrimidine dimers (CPDs) and (6-4) pyrimidine-pyrimidone photoproducts [(6-4)PPs] in the Saccharomyces cerevisiae genome. We find that these photoproducts are removed from the genome primarily by incisions 13-18 nucleotides 5’ and 6-7 nucleotides 3’ to the UV damage that generate 21-27 nt-long excision products. Analyses of the excision repair kinetics both in single genes and at the genome-wide level reveal strong transcription-coupled repair of the transcribed strand (TS) at early time points followed by predominantly non-transcribed strand (NTS) repair at later stages. We have also characterized the excision repair level as a function of transcription level. The availability of high-resolution and dynamic repair maps should aid in future repair and mutagenesis studies in this model organism.
2018-04-12 | GSE110621 | GEO