通过RNA局部化对纳米的翻译调节
1Whitehead Institute for Biomedical Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge 02142.
Nature
|May 26, 1994
概括
在Drosophila胚胎中的RNA局部化对发育至关重要. 非局部化纳米 (nos) RNA被转化抑制,后部局部化缓解了镇压,揭示了一个新的转化调节机制.
科学领域:
- 发展生物学 发展生物学
- 分子遗传学 分子遗传学
- 基因组学就是基因组学.
背景情况:
- 纳米 (nos) RNA和蛋白质的适当的空间调节对于Drosophila胚胎发育,特别是腹部形成至关重要.
- 母性合成的鼻RNA局部存在于后极,形成一个梯度,通过抑制巴和比科伊德的翻译来调节基因表达.
- 我们的RNA局部或功能的缺陷会导致严重的胚胎模式缺陷,包括腹部异常.
研究的目的:
- 研究Drosophila胚胎生成期间控制纳米 (nos) RNA活动的调控机制.
- 确定RNA局部化在我们mRNA的翻译控制中的作用.
- 阐明我们的RNA的后部局部化如何确保适当的胚胎发育.
主要方法:
- 从女性携带突变后部组基因影响我们的RNA定位的Drosophila胚胎的分析.
- 在局部和非局部群体中检查我们的RNA稳定性和翻译状态.
- 对第3'未翻译区域 (3'UTR) 的实验性操纵和用异质序列替换.
主要成果:
- 后组突变胚胎中的非局部化 nos RNA 尽管稳定,但在翻译上被抑制.
- 3'UTR被认为是这种翻译抑制的调解者.
- 诺斯RNA的转化抑制可以通过后部定位或通过用其他序列取代诺斯3'UTR来缓解.
结论:
- RNA局部化作为Drosophila胚胎生成中翻译调节的新机制.
- 我们RNA的后部定位不仅对空间分布至关重要,而且对激活其翻译也至关重要.
- 这项研究揭示了RNA局部化和转化控制在建立发育模式中的复杂相互作用.
相关概念视频
01:23Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
01:53RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
02:22Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
02:22Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
01:23Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
01:29Translational Regulation
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