Reconstructing human pancreatic gene networks enhances stem cell-derived β cell induction.

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Regenerative Medicine

Background:

• Generating functional beta cells from stem cells is crucial for regenerative medicine but challenging due to incomplete in vitro recapitulation of human pancreatic development.
• Existing stem cell differentiation protocols often fail to replicate the complex gene co-expression networks (GCNs) observed during human pancreatic development.

Purpose of the Study:

• To map gene co-expression networks (GCNs) underlying human and mouse pancreatic lineage progression.
• To benchmark current differentiation protocols against in vivo data and identify limitations.
• To develop an improved protocol that reconstructs human pancreatic GCN dynamics for efficient stem cell-derived beta cell (SC-β cell) generation.

Main Methods:

• Integrated single-cell RNA sequencing (RNA-seq) datasets from human embryos (Carnegie stages 10-15) and mice to map GCNs.
• Benchmarked three common stem cell differentiation protocols against in vivo GCN data.
• Developed and tested a novel protocol designed to reconstruct human pancreatic GCN dynamics.

Main Results:

• Identified significant species-specific differences in GCN robustness and progenitor development.
• Demonstrated that current protocols do not reproduce human-like GCNs, limiting SC-β cell induction.
• The new protocol shortened induction to 19 days and achieved up to ~70% β cell content.
• Transplanted SC-islets alleviated diabetic symptoms in mice and maintained mature β cell function.

Conclusions:

• The developed protocol effectively reconstructs human pancreatic GCN dynamics, overcoming limitations of previous methods.
• This advancement significantly improves the efficiency and maturity of stem cell-derived beta cells.
• The findings bridge the gap between in vivo developmental mechanisms and in vitro differentiation, paving the way for improved stem cell-based therapies for diabetes.