在Xenopus laevis发育中的中枢神经系统中,平面诱导前后背图案
T Doniach1, C R Phillips, J C Gerhart
1Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Science (New York, N.Y.)
|July 24, 1992
概括
平面信号,而不仅仅是垂直信号,可以在脊椎动物中枢神经系统中建立前后 (A-P) 模式. 这项研究表明,ectoderm可以通过侧对侧通信自我组织AP神经模式.
科学领域:
- 发育生物学是发展生物学.
- 神经科学是一个神经科学.
- 胚胎学 胚胎学
背景情况:
- 脊椎动物中枢神经系统的前后 (A-P) 模式对于发育至关重要.
- 传统上,人们认为背脊中皮层的垂直信号完全诱导背脊外皮层的AP模式.
研究的目的:
- 研究平面信号在建立AP神经模式中的作用.
- 为了确定是否与组织表面平行传输的信号可以诱导AP神经模式.
主要方法:
- 实验是使用早期Xenopus laevis gastrulae.的扩展物进行的.
- 背部外皮和中皮之间垂直接触被手术阻止.
- 这些组织之间保持平面接触.
主要成果:
- 分析了四个特定的神经标记 (engrailed-2,Krox-20,XlHbox 1和XlHbox 6) 的表达模式.
- 这些标记物以正确的AP序列在背部外皮表达,反映了完整胚胎中的模式.
- 这表明平面信号足以诱导AP神经模式.
结论:
- 脊椎动物胚胎前后 (A-P) 神经模式不仅仅依赖于垂直诱导信号.
- 平面信号与组织表面平行传输,可以独立建立AP神经模式.
- 这一发现挑战了之前的假设,并突出了神经发育中的替代机制.
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