Mesenchymal SLMAP coordinates with MST3 to govern gut elongation during development

Area of Science:

• Developmental biology
• Molecular biology
• Gastroenterology

Background:

• Gut elongation in mice is rapid during late embryogenesis but slows postnatally.
• The molecular mechanisms governing this dynamic gut morphogenesis are not fully understood.

Purpose of the Study:

• To identify the key regulators of gut elongation during mouse development.
• To elucidate the molecular pathways controlling YAP activity in intestinal fibroblasts.

Main Methods:

• Single-cell RNA-sequencing analysis was used to identify key molecular players.
• Gene deletion studies (Slmap, Mst3) in mouse models were performed.
• YAP activity and cell proliferation were assessed in genetically modified mice.

Main Results:

• YAP activity in intestinal fibroblasts is crucial for gut elongation.
• Sarcolemma membrane-associated protein (SLMAP) regulates YAP activity by controlling MST3 kinase.
• Deletion of Slmap leads to a short gut and reduced cell proliferation, while Mst3 depletion enhances gut length.

Conclusions:

• SLMAP and MST3 kinase interaction regulates mesenchymal YAP activity, a key driver of dynamic gut elongation.
• This pathway is critical for both embryonic and postnatal gut development in mice.