ArticleInternational journal of oral science2026
Gli2 and Gli3 synergistically mediate HH-TGF-β crosstalk in mesenchymal progenitor cells to orchestrate tooth root morphogenesis.
Article in International journal of oral science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Hedgehog (HH) signaling is essential in directing the fate determination of postmigratory cranial neural crest cells (CNCCs) to ensure proper craniofacial development. Gli transcription factors (TFs) are established as primary effectors of HH signaling, yet their distinct roles and regulatory mechanisms in governing cell commitment and differentiation of postmigratory CNCCs remain poorly understood. Here, using tooth root as a model, we combined transgenic mouse models with bioinformatic analyses to interrogate the functions of Gli2 and Gli3 in CNCC-derived root progenitor cells of the mouse molar. We revealed that loss of Gli3 alone in dental mesenchymal root progenitor cells caused shortened roots and that concurrent loss of Gli2 and Gli3 exacerbated root malformations, concomitant with profound impairments in cell proliferation and multilineage differentiation, suggesting a synergistic interaction between Gli2 and Gli3 during tooth root development. Mechanistically, Gli2 and Gli3 cooperatively regulated the transcription of Acvr2b, thereby modulating the activity of TGF-β/SMAD signaling within the dental mesenchyme. This Gli2/Gli3-TGF-β signaling cascade was critical for the lineage specification of tooth root progenitor cells during molar morphogenesis. Collectively, this work uncovers synergistic interactions of Gli2 and Gli3 in orchestrating tooth root morphogenesis and provides a novel insight into HH-TGF-β crosstalk in cell fate decisions of postmigratory CNCCs.
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