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| Item Type: | Article |
|---|---|
| Title: | Insm1 cooperates with Neurod1 and Foxa2 to maintain mature pancreatic β-cell function |
| Creators Name: | Jia, S., Ivanov, A., Blasevic, D., Müller, T., Purfürst, B., Sun, W., Chen, W., Poy, M.N., Rajewsky, N. and Birchmeier, C. |
| Abstract: | Key transcription factors control the gene expression program in mature pancreatic {beta}-cells, but their integration into regulatory networks is little understood. Here, we show that Insm1, Neurod1 and Foxa2 directly interact and together bind regulatory sequences in the genome of mature pancreatic {beta}-cells. We used Insm1 ablation in mature {beta}-cells in mice and found pronounced deficits in insulin secretion and gene expression. Insm1-dependent genes identified previously in developing {beta}-cells markedly differ from the ones identified in the adult. In particular, adult mutant {beta}-cells resemble immature {beta}-cells of newborn mice in gene expression and functional properties. We defined Insm1, Neurod1 and Foxa2 binding sites associated with genes deregulated in Insm1 mutant {beta}-cells. Remarkably, combinatorial binding of Insm1, Neurod1 and Foxa2 but not binding of Insm1 alone explained a significant fraction of gene expression changes. Human genomic sequences corresponding to the murine sites occupied by Insm1/Neurod1/Foxa2 were enriched in single nucleotide polymorphisms associated with glycolytic traits. Thus, our data explain part of the mechanisms by which {beta}-cells maintain maturity: Combinatorial Insm1/Neurod1/Foxa2 binding identifies regulatory sequences that maintain the mature gene expression program in {beta}-cells, and disruption of this network results in functional failure. |
| Keywords: | Development, Differentiation, Insm1, Maturation, Metabolisms, Pancreatic beta Cells, Animals, Mice |
| Source: | EMBO Journal |
| ISSN: | 0261-4189 |
| Publisher: | EMBO Press / Wiley |
| Volume: | 34 |
| Number: | 10 |
| Page Range: | 1417-1433 |
| Date: | 12 May 2015 |
| Official Publication: | https://doi.org/10.15252/embj.201490819 |
| PubMed: | View item in PubMed |
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