Cell movements at Hensen's node establish left/right asymmetric gene expression in the chick.

Cell movements at Hensen's node establish left/right asymmetric gene expression in the chick.
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DOI:
10.1126/science.1172478
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发表时间:
2009-05-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Tabin CJ
Tabin CJ
中科院分区:
其他
文献类型:
--
作者:
Gros J;Feistel K;Viebahn C;Blum M;Tabin CJ

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在脊椎动物中,内脏明显的左-右(L/R)解剖不对称可以追溯到原肠形成时或接近原肠形成时发生的分子事件。然而,这一过程的最早步骤似乎并不是普遍保守的。特别是,这个轴是如何在雏鸡身上首次定义的,仍然是个问题。在这里,我们展示了不对称的细胞重排发生在鸡胚内,导致细胞在结节周围向左移动。正是表达Sonic hedgehog(Shh)和成纤维细胞生长因子8(Fgf8)的细胞的相对位移负责建立它们的不对称表达模式。作为细胞运动的消极影响,不对称表达结构域的创建代表了打破L/R基因活性对称性的另一种策略。
In vertebrates, the readily apparent left-right (L/R) anatomical asymmetries of the internal organs can be traced to molecular events initiated at or near the time of gastrulation. However, the earliest steps of this process do not seem to be universally conserved. In particular, how this axis is first defined in chicks has remained problematic. Here we show that asymmetric cell rearrangements take place within chick embryos, creating a leftward movement of cells around the node. It is the relative displacement of cells expressing Sonic hedgehog (Shh) and Fibroblast growth factor 8 (Fgf8) that is responsible for establishing their asymmetric expression patterns. The creation of asymmetric expression domains as a passive effect of cell movements represents an alternative strategy for breaking L/R symmetry in gene activity.
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