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Updated: Aug 27, 2025
09:35
A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
Published on: July 16, 2016
11.2K
Dynamic Ins2 Gene Activity Defines β-Cell Maturity States.
Chieh Min Jamie Chu1, Honey Modi1, Cara Ellis1
1Diabetes Focus Team, Life Sciences Institute, Departments of Cellular and Physiological Sciences and Surgery, University of British Columbia, Vancouver, Canada.
Diabetes
|September 28, 2022
Summary
Insulin gene activity in pancreatic beta cells is dynamic, not fixed. This cellular heterogeneity in insulin production reflects changing gene activity states, impacting beta cell function and viability.
Area of Science:
- Endocrinology
- Cell Biology
- Genetics
Background:
- Pancreatic beta cells exhibit functional specialization.
- Beta cell heterogeneity in insulin production is well-documented.
- The stability of this heterogeneity (stable vs. dynamic states) remains unclear.
Purpose of the Study:
- To investigate the temporal dynamics of endogenous insulin gene activity in beta cells.
- To determine if beta cell heterogeneity arises from stable differences or dynamic cellular states.
- To correlate insulin gene activity levels with beta cell maturity and viability.
Main Methods:
- Live cell imaging of insulin gene (Ins2) activity in Ins2GFP knockin mice.
- Fluorescence-activated cell sorting (FACS) for Ins2(GFP) expression levels.
- Single-cell RNA sequencing (scRNA-seq) of beta cells.
- Autocorrelation analysis to identify oscillating gene activity.
Main Results:
- Approximately 25% of beta cells showed high Ins2 gene activity at any given time.
- Live imaging revealed dynamic, oscillating Ins2 gene activity with a mean period of 17 hours.
- Increased glucose stimulated more cells to oscillate and raised average Ins2 gene activity.
- Ins2(GFP)HIGH cells displayed markers of maturity but had reduced viability, especially under stress.
Conclusions:
- Beta cell heterogeneity in insulin production is driven by dynamic, oscillating states of insulin gene activity.
- These dynamic states are influenced by glucose levels.
- High insulin gene activity is linked to beta cell maturity but also to decreased viability.
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