冷震域蛋白LIN-28控制了C. elegans的发育时间,并由lin-4RNA调节
1Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA.
Cell
|March 7, 1997
概括
在C. eleganslin-28基因的突变通过跳过幼虫阶段来加速发育. LIN-28蛋白在转录后调节中起作用,由lin-4RNA控制,以确保适当的发育时间.
科学领域:
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 在C. elegans中,异常基因lin-28调节了发育时间.
- 林-28中的突变导致早期发育,跳过特定的幼虫阶段事件.
- LIN-28是一种细胞质蛋白质,其域表明了转录后调节功能.
研究的目的:
- 研究林-28在C. elegans发育中的作用.
- 阐明lin-4微RNA通路对lin-28调节的机制.
- 了解lin-28如何控制特定阶段的细胞命运.
主要方法:
- 对lin-28突变及其发育表型的分析.
- 在lin-28 3'UTR.中的监管要素的识别和描述.
- 研究lin-4RNA与lin-28基因之间的相互作用.
主要成果:
- 参与转录后调节的LIN-28蛋白具有冷冲击域和CCHC指纹图案.
- 林-28 3'UTR 含有一种保护元素 (LCE),可以补充林-4 调控RNA.
- lin-4活动和LCE都对lin-28.8的特定阶段调节至关重要.
- 删除LCE会导致占主导地位的功能获取等位基因,导致发育迟缓.
结论:
- 在控制特定发育阶段的细胞命运方面,LIN-28起到关键的作用.
- 这种lin-4/LCE相互作用对于lin-28的适当时间调节至关重要.
- LIN-28的活性受到严格控制,以确保C. elegans的正确发育进展.
相关概念视频
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Translational Regulation
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...


