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- W1963330390 abstract "Dlx homeodomain transcription factors are expressed in neural crest-derived mesenchyme of the pharyngeal arches and are required for patterning of the craniofacial skeleton. However, the cellular and molecular mechanisms by which Dlx factors control skeletogenesis in the facial primordia are unclear. We have investigated the function of Dlx2 and Dlx5 by sustained misexpression in ovo. We find that RCAS-Dlx2- and RCAS-Dlx5-infected avian embryos exhibit very similar patterns of local, stereotypical changes in skeletal development in the upper jaw. The changes include ectopic dermal bone along the jugal arch, and ectopic cartilages that develop between the quadrate and the trabecula. The ectopic cartilage associated with the trabecula is reminiscent of a normally occurring element in this region in some bird taxa. Analysis of the distribution of RCAS-Dlx2-infected cells suggests that Dlx2 induces aggregation of undifferentiated mesenchyme, which subsequently develops into the ectopic skeletal elements. Comparison of infected embryos with restricted or widespread misexpression, and of embryos in which Dlx genes were delivered to migratory or postmigratory neural crest, indicate that there are limited regions of competence in which the ectopic elements can arise. The site-specific differentiation program that the aggregates undergo may be dependent on local environmental signals. Our results suggest that Dlx factors mediate localization of ectomesenchymal subpopulations within the pharyngeal arches and in doing so define where skeletogenic condensations will arise. Consequently, variation in Dlx expression or activity may have influenced the morphology of jaw elements during vertebrate evolution." @default.
- W1963330390 created "2016-06-24" @default.
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- W1963330390 date "2010-09-23" @default.
- W1963330390 modified "2023-09-25" @default.
- W1963330390 title "Role of Dlx genes in craniofacial morphogenesis: Dlx2 influences skeletal patterning by inducing ectomesenchymal aggregation in ovo" @default.
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- W1963330390 doi "https://doi.org/10.1111/j.1525-142x.2010.00432.x" @default.
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