Tbx1 controls the morphogenesis of pharyngeal pouch epithelia through mesodermal Wnt11r and Fgf8a.

Tbx1 controls the morphogenesis of pharyngeal pouch epithelia through mesodermal Wnt11r and Fgf8a.
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DOI:
10.1242/dev.111740
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发表时间:
2014-09
期刊:
Development (Cambridge, England)
影响因子:
--
通讯作者:
Crump JG
Crump JG
中科院分区:
其他
文献类型:
--
作者:
Choe CP;Crump JG

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咽囊是一系列节段性的上皮结构,组成了脊椎动物胚胎的面部。在携带DiGeorge综合征基因TBX1同源基因突变的小鼠和斑马鱼中,缺乏眼袋与严重的头面部缺陷有关,但TBX1如何控制眼袋发育尚不清楚。通过对斑马鱼的突变和转基因挽救实验,我们证明了TBX1在中胚层通过wnt11r和Fgf8a的表达促进内囊形成内胚层的形态发生。一直以来,wnt11r和Fgf8a的复合缺失以及Wnt11r和Fgf8a的中胚层特异性修复可以拯救TBX1突变的囊袋。时间推移成像进一步显示,Fgf8a作为Wnt11r依赖的指导信号迁移眼袋细胞。因此,我们提出了一个两步模型,在该模型中,TBX1协调袋形成细胞的Wnt依赖的上皮不稳定,使它们集体迁移到表达Fgf8a的中胚层导柱。
The pharyngeal pouches are a segmental series of epithelial structures that organize the embryonic vertebrate face. In mice and zebrafish that carry mutations in homologs of the DiGeorge syndrome gene TBX1, a lack of pouches correlates with severe craniofacial defects, yet how Tbx1 controls pouch development remains unclear. Using mutant and transgenic rescue experiments in zebrafish, we show that Tbx1 functions in the mesoderm to promote the morphogenesis of pouch-forming endoderm through wnt11r and fgf8a expression. Consistently, compound losses of wnt11r and fgf8a phenocopy tbx1 mutant pouch defects, and mesoderm-specific restoration of Wnt11r and Fgf8a rescues tbx1 mutant pouches. Time-lapse imaging further reveals that Fgf8a acts as a Wnt11r-dependent guidance cue for migrating pouch cells. We therefore propose a two-step model in which Tbx1 coordinates the Wnt-dependent epithelial destabilization of pouch-forming cells with their collective migration towards Fgf8a-expressing mesodermal guideposts.
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