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• W4378782008 abstract "Abstract The genetic disorder, ataxia‐telangiectasia (A‐T), is caused by loss of the homeostatic protein kinase, ATM, and combines genome instability, tissue degeneration, cancer predisposition, and premature aging. Primary fibroblasts from A‐T patients exhibit premature senescence when grown at ambient oxygen concentration (21%). Here, we show that reducing oxygen concentration to a physiological level range (3%) dramatically extends the proliferative lifespan of human A‐T skin fibroblasts. However, they still undergo senescence earlier than control cells grown under the same conditions and exhibit high genome instability. Comparative RNA‐seq analysis of A‐T and control fibroblasts cultured at 3% oxygen followed by cluster analysis of differentially expressed genes and functional enrichment analysis, revealed distinct transcriptional dynamics in A‐T fibroblasts senescing in physiological oxygen concentration. While some transcriptional patterns were similar to those observed during replicative senescence of control cells, others were unique to the senescing A‐T cells. We observed in them a robust activation of interferon‐stimulated genes, with undetected expression the interferon genes themselves. This finding suggests an activation of a non‐canonical cGAS‐STING‐mediated pathway, which presumably responds to cytosolic DNA emanating from extranuclear micronuclei detected in these cells. Senescing A‐T fibroblasts also exhibited a marked, intriguely complex alteration in the expression of genes associated with extracellular matrix (ECM) remodeling. Notably, many of the induced ECM genes encode senescence‐associated secretory phenotype (SASP) factors known for their paracrine pro‐fibrotic effects. Our data provide a molecular dimension to the segmental premature aging observed in A‐T patients and its associated symptoms, which develop as the patients advance in age." @default.
• W4378782008 created "2023-06-01" @default.
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• W4378782008 date "2023-05-30" @default.
• W4378782008 modified "2023-09-30" @default.
• W4378782008 title "Accelerated replicative senescence of ataxia‐telangiectasia skin fibroblasts is retained at physiologic oxygen levels, with unique and common transcriptional patterns" @default.
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• W4378782008 doi "https://doi.org/10.1111/acel.13869" @default.
• W4378782008 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37254625" @default.
• W4378782008 hasPublicationYear "2023" @default.
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