Evolution of leftward flow

被引:47
作者
Blum, Martin [1 ]
Weber, Thomas [1 ]
Beyer, Tina [1 ]
Vick, Philipp [1 ]
机构
[1] Univ Hohenheim, Inst Zool, D-70593 Stuttgart, Germany
关键词
Left-right asymmetry; Evolution; Nodal; Cilia; Superficial mesoderm; LEFT-RIGHT ASYMMETRY; LEFT-RIGHT AXIS; LEFT-RIGHT DIFFERENCE; NODAL-RELATED GENE; SEA-URCHIN EMBRYO; KUPFFERS VESICLE; VERTEBRATE EMBRYO; NOTOCHORDAL PLATE; RABBIT EMBRYO; CHICK-EMBRYOS;
D O I
10.1016/j.semcdb.2008.11.005
中图分类号
Q2 [细胞生物学];
学科分类号
071013 [干细胞生物学];
摘要
The asymmetric Nodal signaling cascade as a prerequisite for asymmetric body plan specification is conserved among deuterostomes. In this review we argue that symmetry breakage by cilia-driven leftward flow presents an ancestral character of vertebrates, likely the chordate phylum and maybe all deuterostomes. In vertebrates, leftward flow occurs in a transient structure, a monociliated epithelium, which is derived from superficial mesoderm and localizes to the archenteron roof during gastrulation. The chick as an example for the highly derived birds lacks superficial mesoderm and flow. This loss should be secondary, as flow is present from fish and amphibians to mammals. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:464 / 471
页数:8
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