A multipotent progenitor domain guides pancreatic organogenesis

Area of Science:

• Developmental Biology
• Genetics
• Cell Biology

Background:

• The mammalian pancreas arises from multipotent progenitors during embryogenesis.
• The precise identity and function of these pancreatic progenitors are not fully understood.

Purpose of the Study:

• To identify distinct progenitor cell populations in the developing pancreas through genome-wide transcription factor analysis.
• To define the characteristics and behavior of pancreatic progenitor cells during embryogenesis.

Main Methods:

• Genome-wide transcription factor expression analysis of the developing pancreas.
• Genetic lineage-tracing experiments in vivo.
• Identification of gene expression domains and cell markers (Pdx1, Ptf1a, cMyc, Cpa1).

Main Results:

• Five discrete gene expression domains were identified in the developing pancreas.
• A specific domain at the pancreatic tree tip harbors multipotent progenitors.
• These progenitors (Pdx1(+)Ptf1a(+)cMyc(High)Cpa1(+)) generate exocrine, endocrine, and duct cells.
• Outgrowth of tip cells leads to differentiation and formation of the pancreatic trunk.

Conclusions:

• A distinct multipotent progenitor compartment exists at the pancreatic tip.
• A model for coordinated branching and cell-type specification is proposed.
• Over 1,100 transcription factors were analyzed, identifying potential regulators of pancreas development and disease.