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© Research
Publication : Developmental biology

Mesodermal Tbx1 is required for patterning the proximal mandible in mice

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Developmental biology - 23 May 2010

Aggarwal VS, Carpenter C, Freyer L, Liao J, Petti M, Morrow BE

Link to Pubmed [PMID] – 20501333

Dev. Biol. 2010 Aug;344(2):669-81

Defects in the lower jaw, or mandible, occur commonly either as isolated malformations or in association with genetic syndromes. Understanding its formation and genetic pathways required for shaping its structure in mammalian model organisms will shed light into the pathogenesis of malformations in humans. The lower jaw is derived from the mandibular process of the first pharyngeal arch (MdPA1) during embryogenesis. Integral to the development of the mandible is the signaling interplay between Fgf8 and Bmp4 in the rostral ectoderm and their downstream effector genes in the underlying neural crest derived mesenchyme. The non-neural crest MdPA1 core mesoderm is needed to form muscles of mastication, but its role in patterning the mandible is unknown. Here, we show that mesoderm specific deletion of Tbx1, a T-box transcription factor and gene for velo-cardio-facial/DiGeorge syndrome, results in defects in formation of the proximal mandible by shifting expression of Fgf8, Bmp4 and their downstream effector genes in mouse embryos at E10.5. This occurs without significant changes in cell proliferation or apoptosis at the same stage. Our results elucidate a new function for the non-neural crest core mesoderm and specifically, mesodermal Tbx1, in shaping the lower jaw.

https://www.ncbi.nlm.nih.gov/pubmed/20501333