NEUROD2 function is dispensable for human pancreatic β cell specification.

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Endocrinology

Background:

• Human pancreatic endocrine cell development involves complex molecular programs.
• The role of neurogenic differentiation factor 2 (NEUROD2) in human endocrinogenesis is not well understood.

Purpose of the Study:

• To investigate the spatiotemporal expression and function of NEUROD2 during human endocrine cell development.
• To determine if NEUROD2 is essential for human beta cell formation.

Main Methods:

• Generated a CRISPR-Cas9 gene-edited human induced pluripotent stem cell (iPSC) line (NEUROD2^{nVenus/nVenus}) to track NEUROD2 expression and function.
• Differentiated iPSCs in vitro to model human endocrine cell development.

Main Results:

• Identified transient NEUROD2 mRNA and reporter expression during human endocrine progenitor formation.
• Observed conserved NEUROD2 expression patterns between human and mouse endocrinogenesis.
• Found no significant impact of NEUROD2 loss on endocrine cell induction or the generation of insulin-producing beta cells and glucagon-secreting alpha cells.

Conclusions:

• NEUROD2 is dispensable for in vitro human beta cell formation.
• The study provides insights into the conserved roles of NEUROD2 in mammalian endocrinogenesis.