Branching morphogenesis is an important process in shaping the arborized structures of several organs. However, the driving force that directs this process from progenitor pools remains incompletely understood. In this lineage tracing study, we investigated the role of Id2+ embryonic progenitor cells in branching organs such as the pancreas, kidney, mammary gland, thyroid gland, and salivary gland. We found that a subset of Id2+ distal progenitor cells in the embryonic pancreas and kidney can give rise to multiple lineages of progeny cells during branching morphogenesis. Id2-labeled cells also supported the postnatal development of the mammary glands. However, Id2+ cells did not contribute to the development of the salivary and thyroid glands. We found the Id2+ cells located in the tip progenitor pools of pancreas and kidney have self-renewal potential and contribute descendants to multiple epithelial cell lineages. Our findings enrich the current model of distal progenitor pools driving branching morphogenesis and provide a new marker to investigate the regularity of branching in these organs.
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