Global tissue revolutions in a morphogenetic movement controlling elongation.

Global tissue revolutions in a morphogenetic movement controlling elongation.
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DOI:
10.1126/science.1199424
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发表时间:
2011-02-25
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Bilder D
Bilder D
中科院分区:
其他
文献类型:
--
作者:
Haigo SL;Bilder D

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极化细胞行为驱动动物胚胎中轴的伸长,但许多组织伸长的潜在机制仍不清楚。果蝇卵在卵子发生过程中经历从球形到椭圆形的伸长过程。在这里,我们使用卵泡(发育中的卵子)的实时成像来阐明卵子伸长的细胞基础。我们发现,延长卵泡经历了反复的轮周向旋转围绕其长轴。整合素或IV型胶原蛋白的卵泡上皮突变体不能旋转和伸长,导致卵圆形。我们提出的证据表明,极化旋转是建立一个极化,纤维状细胞外基质(ECM),约束组织形状所必需的。因此,全局组织旋转是一种新的形态发生行为,其使用ECM中的平面极性信息来控制组织伸长。
Polarized cell behaviors drive axis elongation in animal embryos, but the mechanisms underlying elongation of many tissues remain unknown. Eggs of Drosophila undergo elongation from a sphere to an ellipsoid during oogenesis. Here, we use live imaging of follicles (developing eggs) to elucidate the cellular basis of egg elongation. We find that elongating follicles undergo repeated rounds of circumferential rotation around their long axes. Follicle epithelia mutant for Integrin or Collagen IV fail to rotate and elongate, resulting in round eggs. We present evidence that polarized rotation is required to build a polarized, fibrillar extracellular matrix (ECM) that constrains tissue shape. Thus, global tissue rotation is a novel morphogenetic behavior that uses planar polarity information in the ECM to control tissue elongation.
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