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CRISPR-based genome editing in primary human pancreatic islet cells
Romina J Bevacqua1, Xiaoqing Dai2, Jonathan Y Lam1
1Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA, USA.
Nature Communications
|April 24, 2021
Summary
This study successfully used CRISPR genome editing in human islets to study diabetes. It identified genetic links between non-coding DNA variants and type 2 diabetes risk, improving our understanding of the disease.
Area of Science:
- Endocrinology
- Genetics
- Molecular Biology
Background:
- Understanding diabetes pathogenesis requires gene targeting in primary human islets.
- Previous studies lacked efficient genome editing tools for human islet cells.
Purpose of the Study:
- To demonstrate successful genome editing in primary human islets using CRISPR-Cas9.
- To investigate the role of specific gene mutations and non-coding variants in beta-cell function and diabetes.
- To link regulatory elements to type 2 diabetes (T2D) genetic susceptibility.
Main Methods:
- Utilized CRISPR-Cas9 technology for genome editing in primary human islets.
- Targeted protein-coding exons of key regulators (PDX1, KIR6.2) and non-coding DNA with T2D risk variants.
- Assessed changes in gene expression and beta-cell function post-editing.
Main Results:
- Achieved efficient mutation of protein-coding exons, leading to loss of PDX1 and KIR6.2.
- Observed impaired beta-cell regulation and function following gene targeting.
- Demonstrated altered expression of ABCC8, SIX2, and SIX3, and impaired beta-cell function upon targeting non-coding DNA with T2D risk variants.
- Linked regulatory elements to T2D genetic susceptibility.
Conclusions:
- Established a paradigm for genetic studies in human islet cells using CRISPR-Cas9.
- Revealed regulatory and genetic mechanisms connecting non-coding variants to human diabetes risk.
- Provided insights into beta-cell dysfunction in diabetes pathogenesis.
