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- W2264171024 abstract "Homozygous Mnx1 mutation causes permanent neonatal diabetes in humans, but via unknown mechanisms. Our systematic and longitudinal analysis of Mnx1 function during murine pancreas organogenesis and into the adult uncovered novel stage-specific roles for Mnx1 in endocrine lineage allocation and β-cell fate maintenance. Inactivation in the endocrine-progenitor stage shows that Mnx1 promotes β-cell while suppressing δ-cell differentiation programs, and is crucial for postnatal β-cell fate maintenance. Inactivating Mnx1 in embryonic β-cells (Mnx1Δbeta) caused β-to-δ-like cell transdifferentiation, which was delayed until postnatal stages. In the latter context, β-cells escaping Mnx1 inactivation unexpectedly upregulated Mnx1 expression and underwent an age-independent persistent proliferation. Escaper β-cells restored, but then eventually surpassed, the normal pancreatic β-cell mass, leading to islet hyperplasia in aged mice. In vitro analysis of islets isolated from Mnx1Δbeta mice showed higher insulin secretory activity and greater insulin mRNA content than in wild-type islets. Mnx1Δbeta mice also showed a much faster return to euglycemia after β-cell ablation, suggesting that the new β-cells derived from the escaper population are functional. Our findings identify Mnx1 as an important factor in β-cell differentiation and proliferation, with the potential for targeting to increase the number of endogenous β-cells for diabetes therapy." @default.
- W2264171024 created "2016-06-24" @default.
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- W2264171024 date "2015-11-01" @default.
- W2264171024 modified "2023-09-26" @default.
- W2264171024 title "Inactivating the permanent neonatal diabetes gene <i>Mnx1</i> switches insulin-producing β-cells to a δ-like fate and reveals a facultative proliferative capacity in aged β-cells" @default.
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- W2264171024 doi "https://doi.org/10.1242/dev.126011" @default.
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