Genetic analysis of Laminin A in Drosophila: extracellular matrix containing laminin A is required for ocellar axon pathfinding.

Genetic analysis of Laminin A in Drosophila: extracellular matrix containing laminin A is required for ocellar axon pathfinding.
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果蝇层粘连蛋白 A 的遗传分析:眼轴突寻路需要含有层粘连蛋白 A 的细胞外基质。

DOI:
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发表时间:
1996
期刊:
影响因子:
4.6
通讯作者:
C. Goodman
C. Goodman
中科院分区:
生物学2区
文献类型:
--
作者:
L. Garcia;R. Fetter;C. Goodman

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对果蝇层粘连蛋白A(LamA)基因的遗传分析表明,不同类别的感觉轴突对含有层粘连蛋白A的细胞外基质(ECM)与上皮细胞表面具有不同的要求。在眼-触角成虫盘中,从三只单眼(单眼)到大脑的神经是由一群短暂的单眼神经元开创的,单眼神经元的轴突在覆盖并连接盘上皮和大脑的ECM上延伸。来自邻近的机械感觉(刚毛)神经元的轴突在ECM下延伸,与椎间盘细胞的表面直接接触,并开辟了在不同位置进入大脑的不同轴突通路。在LamA突变体中,单眼先驱轴突显示出惊人的寻路缺陷,而邻近的刚毛轴突似乎正常;单眼先驱通常在适当的方向延伸,粘附在上皮细胞上,有时与机械感觉轴突成束,但它们总是无法到达大脑。
Genetic analysis of the Laminin A (LamA) gene in Drosophila reveals that distinct classes of sensory axons have different requirements for extracellular matrix (ECM) containing laminin A versus epithelial cell surfaces. In the eye-antenna imaginal disc, the nerve from the three simple eyes (ocelli) to the brain is pioneered by a population of transient ocellar neurons whose axons extend on an ECM that covers and connects the disc epithelium and brain. Axons from neighboring mechanosensory (bristle) neurons extend under the ECM in direct contact with the surface of the disc cells, and pioneer a different axon pathway that enters the brain in a different location. In LamA mutants, the ocellar pioneer axons display striking pathfinding defects, while neighboring bristle axons appear normal; the ocellar pioneers usually extend in the proper direction, adhering to the epithelium and sometimes fasciculating with mechanosensory axons, but they invariably fail to reach the brain.
DOI: 10.1073/pnas.87.9.3264
发表时间: 1990-05-01
影响因子: 11.1
作者:
EHRIG, K;LEIVO, I;ENGVALL, E
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