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Genome wide mapping of histone mark and transcription factor binding in the context of replicative senescence in IMR90 cells.

ABSTRACT: Genome wide mapping of histone mark and transcription factor binding in the context of replicative senescence in IMR90 cells.

PROVIDER: PRJNA610867 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11255759.fastq.gz	Fastqsanger.gz
	SRR11255760.fastq.gz	Fastqsanger.gz
	SRR11255761.fastq.gz	Fastqsanger.gz
	SRR11255762.fastq.gz	Fastqsanger.gz
	SRR11255763.fastq.gz	Fastqsanger.gz

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Genome wide mapping of histone mark and transcription factor binding in the context of replicative senescence in IMR90 cells.

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Changes in gene expression of Imr90 cells with age and senescence under 3% and 20% oxygen growth conditions

Project description:Senescent is an irreversible form of cell cycle arrest initiated by damaged cell constituents and subsequent pro-oncogenic signaling. Replicative senescence in vitro can be considered a model for human aging. When fibroblasts are cultured under atmospheric oxygen conditions of 20%, typical of normal tissue culture procedure, fibroblasts generally reach their replicative capacity at 50-60 population doublings (PDs). When fibroblasts are cultured under normal physiological oxygen conditions of 3%, PDs increase about 30% relative to atmospheric levels. Hence while oxygen is a requirement for normal aerobic respiration, it can contribute to the total amount of oxidative stress to which cells are exposed to, leading to a long-term adverse effect in vitro. Inasmuch, cultures maintained under hyperoxic and hypoxic conditions provide a convenient model system for assessing the relationship between oxygen/oxidative stress and senescence. We used microarrays to profile the changes in global gene expression during aging and senescence of Imr90 cells under growth oxygen conditions of 3% and 20%. Imr90 cells at various population doubling timepoints (young, old, and senescent) grown separately under 3 and 20% oxygen growth conditions were selected for RNA extraction and hybridization on Affymetrix microarrays. Timepoints from cells grown under 3% and 20% oxygen conditions were age matched via population doublings to ensure accurate cross sample comparison.

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