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• W4377233035 abstract "<p>The loss of pancreatic β-cell identity emerges as an important feature of type 2 diabetes development, but the molecular mechanisms are still elusive. Here, we explore the cell-autonomous role of the cell cycle regulator and transcription factor E2F1 in the maintenance of β-cell identity, insulin secretion and glucose homeostasis. We show that the β-cell-specific loss of <em>E2f1 </em>function in mice triggers glucose intolerance associated with defective insulin secretion, an altered endocrine cell mass, a downregulation of many β-cell genes and a concomitant increase of non-β-cell markers. Mechanistically, the epigenomic profiling of promoters of these non-β-cell upregulated genes identified an enrichment of bivalent H3K4me3/H3K27me3 or H3K27me3 marks. Conversely, promoters of downregulated genes were enriched in active chromatin H3K4me3 and H3K27ac histone marks. We find that specific E2f1 transcriptional, cistromic and epigenomic signatures are associated with these β-cell dysfunctions, with E2F1 directly regulating several β-cell genes at the chromatin level. Finally, the pharmacological inhibition of E2F transcriptional activity in human islets also impairs insulin secretion and the expression of β-cell identity genes. Our data suggest that E2F1 is critical for maintaining β-cell identity and function through a sustained control of β-cell and non β-cell transcriptional programs. </p>" @default.
• W4377233035 created "2023-05-23" @default.
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• W4377233035 date "2023-05-22" @default.
• W4377233035 modified "2023-10-18" @default.
• W4377233035 title "<strong>β-cell specific</strong> <em><strong>E2f1 </strong></em><strong>deficiency impairs glucose homeostasis, β-cell</strong> <strong>identity and insulin secretion</strong>" @default.
• W4377233035 doi "https://doi.org/10.2337/figshare.22906517.v1" @default.
• W4377233035 hasPublicationYear "2023" @default.
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