MLL4 regulates palatal salivary gland development

MLL4 (KMT2D) is essential for palatal salivary gland morphogenesis in Osr2-Cre–mediated Mll4 conditional knockout mice, where glands are hypoplastic from birth and ectopic cartilage forms.

• Why it matters: Palatal glands are important for oral lubrication and defense, and they are a common site of minor salivary gland tumors, yet the developmental molecular programs are poorly defined.
• What they did: Using Mll4fl/fl;Osr2-Cre mice, the study combined RNA-seq with in situ hybridization, immunofluorescence, and Ki67 staining to assess mesenchymal–epithelial signaling and proliferation.
• The result: Mll4 loss downregulated salivary development, branching morphogenesis, and FGF/WNT-linked programs while reducing mesenchymal Fgf10 and epithelial SOX9/Edar, and it decreased epithelial proliferation without changing apoptosis, implicating MLL4 in coordinated signaling and proper soft-palate developmental programs.

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