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Updated: Aug 6, 2026
Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay
Published on: January 12, 2022
The fringe molecules induce endocrine differentiation in embryonic endoderm by activating cMyt1/cMyt3
Yanwen Xu1, Sui Wang, Jia Zhang
1Vanderbilt University, Department of Cell and Developmental Biology, Nashville, TN 37232, USA.
Abstract:
Endocrine differentiation in the early embryonic pancreas is regulated by Notch signaling. Activated Notch signaling maintains pancreatic progenitor cells in an undifferentiated state, whereas suppression of Notch leads to endocrine cell differentiation. Yet it is not known what mechanism is employed to inactivate Notch in a correct number of precursor cells to balance progenitor proliferation and differentiation. We report that an established Notch modifier, Manic Fringe (Mfng), is expressed in the putative endocrine progenitors, but not in exocrine pancreatic tissues, during early islet differentiation. Using chicken embryonic endoderm as an assaying system, we found that ectopic Mfng expression is sufficient to induce endodermal cells to differentiate towards an endocrine fate. This endocrine-inducing activity depends on inactivation of Notch. Furthermore, ectopic Mfng expression induces the expression of basic helix-loop-helix gene, Ngn3, and two zinc finger genes, cMyt1 and cMyt3. These results suggest that Mfng-mediated repression of Notch signaling could serve as a trigger for endocrine islet differentiation.
Insights
Manic Fringe (Mfng) protein triggers endocrine cell differentiation in the embryonic pancreas by suppressing Notch signaling. This discovery reveals a key mechanism balancing progenitor cell proliferation and differentiation for proper islet development.
Area of Science:
- Developmental Biology
- Cell Signaling
- Endocrinology
Background:
- Notch signaling is crucial for pancreatic development, maintaining progenitor cells in an undifferentiated state.
- Suppression of Notch signaling promotes endocrine cell differentiation, but the precise inactivation mechanism remains unclear.
- Balancing progenitor proliferation and differentiation is essential for correct islet formation.
Purpose of the Study:
- To investigate the mechanism of Notch signaling inactivation during early pancreatic endocrine differentiation.
- To identify factors involved in regulating the balance between pancreatic progenitor proliferation and differentiation.
- To explore the role of Manic Fringe (Mfng) in endocrine islet development.
Main Methods:
- Utilizing chicken embryonic endoderm as an experimental system.
- Analyzing the expression patterns of Manic Fringe (Mfng) during early islet differentiation.
- Performing ectopic Mfng expression experiments in endodermal cells.
- Assessing the impact of Mfng on Notch signaling activity and key gene expression (Ngn3, cMyt1, cMyt3).
Main Results:
- Manic Fringe (Mfng) is specifically expressed in putative endocrine progenitors, not exocrine tissues.
- Ectopic Mfng expression in endodermal cells induced endocrine differentiation.
- Mfng-induced endocrine differentiation was dependent on Notch signaling inactivation.
- Mfng promoted the expression of Ngn3, cMyt1, and cMyt3 genes.
Conclusions:
- Manic Fringe (Mfng) acts as a crucial regulator in pancreatic endocrine differentiation.
- Mfng-mediated repression of Notch signaling serves as a trigger for endocrine islet development.
- Understanding Mfng's role provides insights into controlling progenitor cell fate and balancing proliferation with differentiation.
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