在Drosophila胚胎中,自和副信号传递有不同的途径
1Department of Cellular and Structural Biology, University of Colorado Health Sciences Center, Denver 80262.
Nature
|December 1, 1994
概括
在Drosophila胚胎中,无翼 (Wg) 和刺 (Hh) 信号相互依赖. 这项研究将这种循环解,揭示了直接Wg自我调节与Wg向邻近细胞发送信号的独特遗传要求.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 无翼 (Wg) 和刺 (Hh) 是分泌的蛋白质,对于Drosophila胚胎的细胞命运决定至关重要.
- 这些信号通路表现出相互依赖,其中Wg稳定了Hh表达,Hh稳定了Wg表达.
- 这种积极反循环对于胚胎发育至关重要,但掩盖了直接的Wg自我调节.
研究的目的:
- 通过使用zeste-white3 (zw3) 和patched (ptc) 突变物来遗传分离Wg-Hh正反循环.
- 为了研究与偏性Wg信号相比,自身隐性Wg信号的独特遗传成分.
- 分析早期的Wg自我调节的时间差异,Hh依赖的阶段与后来的发育阶段.
主要方法:
- 在Drosophila胚胎中使用了zeste-white3 (zw3) 和patched (ptc) 突变背景.
- 采用基因操纵来隔离和研究自克林无翼信号.
- 在不同的信号条件下,比较了Wg自我调节的遗传要求.
主要成果:
- 直接Wg自我调节显示了与zw3和 (手臂) 相比,对融合 (fu),光滑 (smo) 和肘部中断 (ci) 等基因的差异依赖.
- 在早期的Hh依赖阶段的Wg自我调节与后来的自我调节不同.
- 果 (gsb) 不参与早期的Wg自我调节,与后期不同.
结论:
- 自分泌Wg信号具有独特的遗传基础,与其分泌功能分开.
- 在胚胎发育过程中,Wg自我调节的遗传控制发生了演变.
- 了解这些独特的调节机制,可以了解发育信号的强度.
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