Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA139271 | ENA |
REPOSITORIES: ENA
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Project description:Chromosomal instability in early cancer stages is caused by stress on DNA replication. The molecular basis for replication perturbation in this context is currently unknown. We studied the replication dynamics in cells in which a regulator of S-phase entry and cell proliferation, the Rb-E2F pathway, is aberrantly activated. Aberrant activation of this pathway by HPV-16 E6/E7 or cyclin E oncogenes, significantly decreased the cellular nucleotide levels in the newly transformed cells. Exogenously supplied nucleosides rescued the replication stress and DNA damage, and dramatically decreased oncogene-induced transformation. Increased transcription of nucleotide biosynthesis genes, mediated by expressing the transcription factor c-Myc, increased the nucleotide pool and also rescued the replication-induced DNA damage. Our results suggest a model for early oncogenesis in which uncoordinated activation of factors regulating cell proliferation leads to insufficient nucleotides that fail to support normal replication and genome stability. In order to understand the molecular basis for the low nucleotide pool in cells enforced to proliferate by oncogene expression, we performed unbiased whole transcriptome analysis of BJ cells in comparison to BJ cells expressing cyclin E, c-Myc and cells co-expressing both oncogenes. Our results suggest that Rb-E2F aberrant activation enforces cell proliferation but fails to activate the nucleotide biosynthesis pathway leading to insufficient pool of nucleotides required for normal replication. We analyzed two sets of BJ cells infected with empty pBabe, Cyclin E, c-Myc or coexpression of Cyclin E and c-Myc
2011-03-31 | E-GEOD-28266 | biostudies-arrayexpress
Project description:Expression data from BJ-hTERT cells expressing shRNA control vector or shRNA against p53.
| PRJNA359683 | ENA
Project description:We generated H3K9me3 profile of reads and peaks of BJ fibroblasts expressing hTERT and SV40 early region (BJ-HELT cell line).
2018-08-04 | GSE102278 | GEO
Project description:Limited data exists regarding changes of microRNA (miRNA) expression during senescence in human cells and no reports correlate telomerase expression with regulation of senescence-related miRNAs. We used miRNA microarrays to provide a detailed account of miRNA profiles for early passage and senescent human foreskin (BJ) fibroblasts as well as early and late passage immortalized fibroblasts (BJ-hTERT) that stably express the human telomerase reverse transcriptase subunit hTERT. The revelation that miRNA expression changes with extended passaging in BJ-hTERT cells will contribute to a comprehensive understanding of the connections between telomerase expression, senescence and processes of cellular aging.
2010-06-05 | GSE22134 | GEO
Project description:Chromosomal instability in early cancer stages is caused by stress on DNA replication. The molecular basis for replication perturbation in this context is currently unknown. We studied the replication dynamics in cells in which a regulator of S-phase entry and cell proliferation, the Rb-E2F pathway, is aberrantly activated. Aberrant activation of this pathway by HPV-16 E6/E7 or cyclin E oncogenes, significantly decreased the cellular nucleotide levels in the newly transformed cells. Exogenously supplied nucleosides rescued the replication stress and DNA damage, and dramatically decreased oncogene-induced transformation. Increased transcription of nucleotide biosynthesis genes, mediated by expressing the transcription factor c-Myc, increased the nucleotide pool and also rescued the replication-induced DNA damage. Our results suggest a model for early oncogenesis in which uncoordinated activation of factors regulating cell proliferation leads to insufficient nucleotides that fail to support normal replication and genome stability. In order to understand the molecular basis for the low nucleotide pool in cells enforced to proliferate by oncogene expression, we performed unbiased whole transcriptome analysis of BJ cells in comparison to BJ cells expressing cyclin E, c-Myc and cells co-expressing both oncogenes. Our results suggest that Rb-E2F aberrant activation enforces cell proliferation but fails to activate the nucleotide biosynthesis pathway leading to insufficient pool of nucleotides required for normal replication.
2011-03-31 | GSE28266 | GEO
Project description:Gene expression profiling was performed by use of serial analysis of gene expression (SAGE) on BJ normal human skin fibroblasts, A-T cells, and BJ and A-T cells transduced with hTERT cDNA and expressing telomerase activity. Keywords = telomere Keywords = telomerase Keywords = TERT Keywords = ataxia telangiectasia mutated Keywords = ATM Keywords = serial analysis of gene expression Keywords = SAGE Keywords = fibroblast Keywords: parallel sample
2004-01-17 | GSE953 | GEO
Project description:Gene expression profiling was performed by use of serial analysis of gene expression (SAGE) on BJ normal human skin fibroblasts, A-T cells, and BJ and A-T cells transduced with hTERT cDNA and expressing telomerase activity. Keywords = telomere Keywords = telomerase Keywords = TERT Keywords = ataxia telangiectasia mutated Keywords = ATM Keywords = serial analysis of gene expression Keywords = SAGE Keywords = fibroblast Keywords: parallel sample
2004-01-16 | E-GEOD-953 | biostudies-arrayexpress
Project description:Gene expression profiling of immortalized human mesenchymal stem cells with hTERT/E6/E7 transfected MSCs. hTERT may change gene expression in MSCs. Goal was to determine the gene expressions of immortalized MSCs.
2010-09-25 | GSE24338 | GEO
Project description:In this study we investigated changes in gene expression induced by HDAC4 and RAS in BJ/hTERT LT/ST cells, 48h after the seeding. The goal of the experiment is: a) to find a common signature of transformation between RAS and HDAC4 over-expressing cells; b) to find the peculiarities of the two oncogenic responses.
2019-03-14 | GSE120040 | GEO
Project description:Measles virus vector expressing the 4 reprogramming factors, OCT4, SOX2, KLF4 and cMYC was produced and used to derived iPSC from neonatal human fibroblasts (BJ). We used microarrays to compare the global gene expression in the derived MV-iPSC and compare it to the parental human neonatal fibroblast (BJ) and human embryonic stem cell (GSM551202)
2019-09-26 | GSE122790 | GEO