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Genome-wide CRISPR Screen Identifies Sec31A as a Key Regulator of Alpha Cell Survival
Kimitaka Shibue1,2, Sevim Kahraman1, Jorge Ivan Castillo-Quan1
1Islet Cell and Regenerative Biology, Joslin Diabetes Center, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA.
Nature Communications
|October 15, 2025
Summary
Sec31A protein regulates survival in pancreatic alpha cells under stress. Loss of Sec31A enhances stress resistance, offering new insights into diabetes and alpha cell function.
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- Pancreatic alpha cells secrete glucagon, crucial for blood glucose homeostasis.
- Alpha cell dysfunction in diabetes impairs glucose regulation.
- Mechanisms of alpha cell stress resistance are not well understood.
Purpose of the Study:
- To identify key regulators of alpha cell survival under stress.
- To investigate the role of Sec31A in alpha cell stress response.
- To explore the link between ER stress, Sec31A, and insulin signaling in alpha cells.
Main Methods:
- Genome-wide CRISPR screening in mouse alpha cells.
- Stress assays in mouse alpha cells and C. elegans.
- Analysis of human islets under inflammatory and ER stress.
- Functional studies in lab-grown human islet clusters.
Main Results:
- Sec31A was identified as a key regulator of alpha cell survival.
- Loss of Sec31A enhanced survival in stressed mouse alpha cells and C. elegans.
- SEC31A expression increased in human alpha cells under inflammatory stress, linked to ER stress.
- Distinct alpha and beta cell responses to Sec31A suppression were observed.
- Sec31A interacts with the insulin receptor.
Conclusions:
- Sec31A plays a critical role in alpha cell stress adaptation.
- Modulating Sec31A may offer therapeutic strategies for diabetes-related alpha cell dysfunction.
- Sec31A links endoplasmic reticulum stress, inflammation, and insulin signaling in alpha cells.
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