Genomic localization of Cockayne syndrom B protein upon genotoxic stresses
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE50925 | GEO | 2015/11/09
SECONDARY ACCESSION(S): PRJNA219382
REPOSITORIES: GEO
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Project description:Cockayne syndrome is an inherited premature aging syndrome associated with developmental and neurological disorders. Mutations in the genomic locus encoding CSB are associated with 80% Cockayne syndrome cases. CSB is invovled in relieving UV-induced and oxidative stree. To gain more insights into the fucntion of CSB under these stress, we use ChIP-seq to determine the genomic localization of CSB 1 hour after UV irradiation and menadione treatment. Genomic localization of CSB and remodeling deficient CSBâN1
2015-11-09 | E-GEOD-50925 | biostudies-arrayexpress
Project description:Cockayne syndrome (CS) is a rare genetic neurodevelopmental disorder, characterized by a deficiency in the transcription-coupled nucleotide excision repair pathway. Mutation of Cockayne syndrome B (CSB) affects basal transcription which is considered a major cause of CS neurological dysfunction. Here, we generated a rat model by mimicking a nonsense mutation in the CSB(ERCC6) gene of CS-B patients. CSB-deficient rats exhibit the well-known CS repair characteristics: inability to resume RNA synthesis from stalled RNA polymerase II (RNAP II) and persistent gamma H2AX overexpression after UV damage. In contrast to that of the Csb-/- mouse models, the cerebella of the CSB-deficient rats are more profoundly affected. Both the molecular and the granular layers of the cerebellum cortex showed significant atrophy. The white matter of the cerebellum demonstrated high GFAP staining indicative of reactive astrogliosis. RNA-seq analysis of CSB-deficient rat cerebella revealed that even in the absence of UV damage, CSB affects the expression of hundreds of genes, many of which are neuronal genes, suggesting that transcription dysregulation could contribute to the neurological features in CSB rat models.
2019-02-05 | GSE126032 | GEO
Project description:Cockayne syndrome is an inherited premature aging syndrome associated with developmental and neurological disorders. Mutations in the genomic locus encoding CSB are associated with 80% Cockayne syndrome cases. Transcription profiling assays reveal the association of mis-regulation of gene expression with Cockayne syndrome, highlighting the importance of CSB in transcription regulation. However, many questions remain unanswered as how CSB regulates transcription. In this study, we dissect the mechanisms by which CSB regulates transcription during normal growth. By anti-CSB chromatin immunoprecipitation followed by deep sequencing, we found CSB is enriched at genomic regions containing TGASTCA motifs, to which the immediate early gene product C-Jun binds specifically. We further demonstrate that c-Jun co-immunoprecipitates with CSB. In addition, the targeting of CSB to genomic region containing TGASTCA motifs was drastically reduced in cells treated c-Jun shRNA. Reverse transcription followed by quantitative PCR indicates that CSB can regulate gene expression nearby its binding sites, both in activation and repression. The remodeling defective CSBM-bM-^HM-^FN1 mutant is also targeted to TGASTCA motifs, but cannot always substitute CSB function in transcription regulating, suggesting the importance of remodeling by CSB in transcription regulation. Notably, the Cockayne syndrome related mutation encoding protein CSBR670W, which is defective in ATP hydrolysis but is targeted to TGASTCA motifs efficiently, indicating that ATP hydrolysis is dispensable for c-Jun mediated CSB targeting, in sharp contrast to the ATP-dependent targeting mechanism by which CSB is relocated to DNA lesion stalled transcription. Together, these results reveal a second CSB targeting mechanism in which DNA sequence specific transcription factor c-Jun targets CSB to specific genomic region and regulate gene expression. Genomic localization of CSB and remodeling deficient CSBM-bM-^HM-^FN1
2014-03-06 | E-GEOD-50171 | biostudies-arrayexpress
Project description:Cockayne syndrome (CS) is a rare genetic disorder caused by mutation of the DNA repair and chromatin remodelling proteins CSA or CSB. Increasing evidences indicate that the progeroid phenotype of CS cannot be solely ascribed to impaired DNA repair, and UV-sensitivity syndrome (UVSS) patients that are also mutated for CSA or CSB do not age prematurely. Epigenetic modifications constitute a hallmark of ageing. We assessed genome-wide DNA methylation (DNAm) at single-nucleotide resolution on fibroblasts derived from CS versus UVSS patients and healthy donors.
2023-12-24 | GSE163840 | GEO
Project description:Cockayne syndrome (CS) is a rare genetic disorder caused by mutation of the DNA repair and chromatin remodelling proteins CSA or CSB. Increasing evidences indicate that the progeroid phenotype of CS cannot be solely ascribed to impaired DNA repair, and UV-sensitivity syndrome (UVSS) patients that are also mutated for CSA or CSB do not age prematurely. Epigenetic modifications constitute a hallmark of ageing. We assessed genome-wide DNA methylation (DNAm) at single-nucleotide resolution on fibroblasts derived from CS versus UVSS patients and healthy donors.
2023-12-24 | GSE163839 | GEO
Project description:Cockayne syndrome B (CSB) protein is a member of the SWI/SNF family and has DNA-dependent ATPase and ATP-dependent chromatin remodeling activities. The CSB protein is missing or altered in CS-B cells. CS-B cells are hypersensitive to UV light and defective in transcription-coupled DNA repair (TCR). TCR efficiently removes a variety of lesions from the transcribed strand of active genes. It has been shown that lesions specifically in the transcribed strand of active genes trigger the induction of apoptosis following UV irradiation. Several DNA damage signaling cascades, including the ATR/Chk1, p38 kinase, p53, and jun N-terminal kinase pathways are activated following UV irradiation. However, the role of TCR in cellular global transcriptional responses to UV irradiation remains to be elucidated. Using oligonucleotide microarray technology, we analyzed the time course of responses of CS-B cells (CS-B) and CS-B cells complemented with wild-type CSB cDNA (CS-B wt). Experiment Overall Design: In order to investigate the global transcriptional responses to UV damage in TCR-proficient or TCR-deficient cells, CS-B wt and CS-B cells were irradiated with 10 J/m2 of UV light and incubated for 2 or 12 hours. All experiments were performed in triplicate.
2008-06-17 | E-GEOD-8939 | biostudies-arrayexpress
Project description:Cockayne syndrome is an inherited premature aging syndrome associated with developmental and neurological disorders. Mutations in the genomic locus encoding CSB are associated with 80% Cockayne syndrome cases. Transcription profiling assays reveal the association of mis-regulation of gene expression with Cockayne syndrome, highlighting the importance of CSB in transcription regulation. However, many questions remain unanswered as how CSB regulates transcription. In this study, we dissect the mechanisms by which CSB regulates transcription during normal growth. By anti-CSB chromatin immunoprecipitation followed by deep sequencing, we found CSB is enriched at genomic regions containing TGASTCA motifs, to which the immediate early gene product C-Jun binds specifically. We further demonstrate that c-Jun co-immunoprecipitates with CSB. In addition, the targeting of CSB to genomic region containing TGASTCA motifs was drastically reduced in cells treated c-Jun shRNA. Reverse transcription followed by quantitative PCR indicates that CSB can regulate gene expression nearby its binding sites, both in activation and repression. The remodeling defective CSB∆N1 mutant is also targeted to TGASTCA motifs, but cannot always substitute CSB function in transcription regulating, suggesting the importance of remodeling by CSB in transcription regulation. Notably, the Cockayne syndrome related mutation encoding protein CSBR670W, which is defective in ATP hydrolysis but is targeted to TGASTCA motifs efficiently, indicating that ATP hydrolysis is dispensable for c-Jun mediated CSB targeting, in sharp contrast to the ATP-dependent targeting mechanism by which CSB is relocated to DNA lesion stalled transcription. Together, these results reveal a second CSB targeting mechanism in which DNA sequence specific transcription factor c-Jun targets CSB to specific genomic region and regulate gene expression.
2014-03-06 | GSE50171 | GEO
Project description:Cockayne syndrome (CS) is a severe disorder with no effective treatment. The Cockayne syndrome group B (CSB) gene is one gene responsible for CS and also causes UV sensitive syndrome (UVSS), a disorder that causes mild symptoms. How the CSB gene determines a patient’s fate is unknown, but one intriguing point is that in UVSS patient cell, there are nonsense mutations in both alleles at the same position in each upstream region of the PiggyBac transposable element derived 3 (PGBD3) inserted region. In contrast, in CS patient cells, there is at least one allele with several mutations downstream of the PGBD3 inserted region, or there are homozygous mutations in exon 1. Here, we designed and synthesized 24 splice switching oligonucleotides (SSOs) to skip exon 3 in CSB mRNA. Use of these SSOs induced a frame shift in order to generate an alternative stop codon at the upstream region of the PGBD3 invasion site. As a result, a reduction of mitochondrial membrane potential following H2O2 treatment in CS cell was recovered. It was demonstrated that up-regulation of several gene expression brought about by SSOs are related to mitochondrial dysfunction in CS cells.
2018-04-09 | GSE111989 | GEO
Project description:Cockayne syndrome (CS) is an inherited neurodevelopmental disorder with progeroid features. Although the genes responsible for CS have been implicated in a variety of DNA repair- and transcription-related pathways, the nature of the molecular defect in CS remains mysterious. We sought to define this defect by expression analysis of cells lacking functional CSB, a SWI/SNF-like ATPase that is responsible for most CS cases. Keywords: primary disease rescue
2006-07-14 | GSE3407 | GEO
Project description:The rare genetic disease Cockayne syndrome (CS) results in mutations in CSA and CSB. Upon UV irradiation, RNA synthesis was arrested: RNA-seq showed 70% of down-regulated genes in common between CSA and CSB deficient cells. ATF3, the product of an immediate early gene was overexpressed and bound to its CRE/ATF site to inhibit its responsive genes. ChIP experiments showed that CSA/CUL4A/DDB1 together with CSB and MDM2, target ATF3. In vivo and in vitro experiments showed that ATF3 was ubiquitilated by a concerted action of CSA and MDM2 ubiquitin-ligases and was further eliminated by the proteasome concomitantly with the recruitment of RNA polymerase II to restart transcription. In CS cells, dysfunctional CSA or CSB were unable to assemble the ubiquitin/proteasome complex, thereby maintaining the ATF3-dependent transcription arrested. Though, in addition to their function in DNA repair, CSA and CSB might thus regulate the timing of DNA binding factors on its specific target site via the ubiquitin/proteasome machinery.
2017-12-01 | GSE87562 | GEO