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- W2022853418 abstract "The neural crest is a multipotent, migratory cell population that contributes to a variety of tissues and organs during vertebrate embryogenesis. Here, we focus on the function of Msx1 and Msx2, homeobox genes implicated in several disorders affecting craniofacial development in humans. We show that Msx1/2mutants exhibit profound deficiencies in the development of structures derived from the cranial and cardiac neural crest. These include hypoplastic and mispatterned cranial ganglia, dysmorphogenesis of pharyngeal arch derivatives and abnormal organization of conotruncal structures in the developing heart. The expression of the neural crest markers Ap-2α, Sox10 and cadherin 6 (cdh6) in Msx1/2mutants revealed an apparent retardation in the migration of subpopulations of preotic and postotic neural crest cells, and a disorganization of neural crest cells paralleling patterning defects in cranial nerves. In addition, normally distinct subpopulations of migrating crest underwent mixing. The expression of the hindbrain markers Krox20 and Epha4 was altered in Msx1/2 mutants, suggesting that defects in neural crest populations may result, in part, from defects in rhombomere identity. Msx1/2 mutants also exhibited increased Bmp4expression in migratory cranial neural crest and pharyngeal arches. Finally,proliferation of neural crest-derived mesenchyme was unchanged, but the number of apoptotic cells was increased substantially in neural crest-derived cells that contribute to the cranial ganglia and the first pharyngeal arch. This increase in apoptosis may contribute to the mispatterning of the cranial ganglia and the hypoplasia of the first arch." @default.
- W2022853418 created "2016-06-24" @default.
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- W2022853418 date "2005-11-15" @default.
- W2022853418 modified "2023-10-17" @default.
- W2022853418 title "Combined deficiencies of<i>Msx1</i>and<i>Msx2</i>cause impaired patterning and survival of the cranial neural crest" @default.
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- W2022853418 doi "https://doi.org/10.1242/dev.02072" @default.
- W2022853418 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16221730" @default.
- W2022853418 hasPublicationYear "2005" @default.
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