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© Aline Bonnet, Institut Pasteur
Coupe transversale d’embryon de caille transgénique mbGFP à 18somites, au niveau du futur bourgeon de membre antérieur avec un marquage noyaux (bleu), GFP (vert) et actine (rouge) / Transversal section of a mbGFP transgenic quail embryo at 18-somite stage, at forelimb level, with nuclei (blue), GFP (green) and actin (red) labelling
Publication : Development (Cambridge, England)

The Dlx5-FGF10 signaling cascade controls cranial neural crest and myoblast interaction during oropharyngeal patterning and development.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Development (Cambridge, England) - 01 Nov 2017

Sugii H, Grimaldi A, Li J, Parada C, Vu-Ho T, Feng J, Jing J, Yuan Y, Guo Y, Maeda H, Chai Y

Link to Pubmed [PMID] – 28982687

Link to DOI – 10.1242/dev.155176

Development 2017 Nov; 144(21): 4037-4045

Craniofacial development depends on cell-cell interactions, coordinated cellular movement and differentiation under the control of regulatory gene networks, which include the distal-less (Dlx) gene family. However, the functional significance of Dlx5 in patterning the oropharyngeal region has remained unknown. Here, we show that loss of Dlx5 leads to a shortened soft palate and an absence of the levator veli palatini, palatopharyngeus and palatoglossus muscles that are derived from the 4th pharyngeal arch (PA); however, the tensor veli palatini, derived from the 1st PA, is unaffected. Dlx5-positive cranial neural crest (CNC) cells are in direct contact with myoblasts derived from the pharyngeal mesoderm, and Dlx5 disruption leads to altered proliferation and apoptosis of CNC and muscle progenitor cells. Moreover, the FGF10 pathway is downregulated in Dlx5-/- mice, and activation of FGF10 signaling rescues CNC cell proliferation and myogenic differentiation in these mutant mice. Collectively, our results indicate that Dlx5 plays crucial roles in the patterning of the oropharyngeal region and development of muscles derived from the 4th PA mesoderm in the soft palate, likely via interactions between CNC-derived and myogenic progenitor cells.