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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Biphasic Ngn3 expression in the developing pancreas.

Alethia Villasenor1, Diana C Chong, Ondine Cleaver

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9148, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|October 17, 2008
PubMed
Summary
This summary is machine-generated.

Neurogenin 3 (Ngn3) expression in developing pancreatic islets occurs in two distinct waves, not continuously. This biphasic pattern correlates with embryonic endocrine cell differentiation and suggests post-transcriptional regulation.

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Area of Science:

  • Developmental biology
  • Endocrinology
  • Molecular biology

Background:

  • Neurogenin 3 (Ngn3) is a bHLH transcription factor essential for pancreatic endocrine cell development.
  • Previous studies indicated transient Ngn3 expression in mouse embryos during midgestation.
  • Ngn3-expressing cells are identified as progenitors for islet endocrine cells.

Purpose of the Study:

  • To comprehensively characterize Ngn3 transcript and protein expression during pancreatic development.
  • To identify and define previously unnoticed patterns of Ngn3 expression.
  • To investigate the correlation between Ngn3 expression dynamics and embryonic endocrine differentiation waves.

Main Methods:

  • Analysis of Ngn3 transcript and protein expression patterns throughout embryonic pancreatic development.
  • Temporal profiling of Ngn3 expression using molecular and cellular techniques.
  • Comparison of Ngn3 transcript distribution versus protein localization.

Main Results:

  • Ngn3 expression exhibits a previously unrecognized biphasic pattern, occurring in two distinct temporal waves (E8.5-E11.0 and starting E12.0).
  • This biphasic expression correlates with the "first" and "second" transitions of embryonic endocrine differentiation.
  • Ngn3 transcripts are more widely distributed in the pancreatic epithelium than Ngn3 protein.

Conclusions:

  • Developmental Ngn3 expression is not continuous but occurs in two distinct waves.
  • The biphasic Ngn3 expression pattern is tightly linked to the sequential waves of endocrine cell differentiation.
  • Post-transcriptional regulation likely plays a significant role in controlling Ngn3 function during pancreatic endocrine development.