调节微RNA池组成的竞争影响.
Sofia B Raak1, Jonathan G Hanley1, Cian O'Donnell2,3
1School of Biochemistry, University of Bristol, University Walk, Clifton, Bristol BS8 1TD, UK.
Journal of the Royal Society, Interface
|February 18, 2025
概括
对Dicer酶的竞争影响了微RNA (miRNA) 的表达. 结合Dicer的预miRNA有效地超越其他,影响最终成熟的miRNA池. 这项研究建模并验证了这种竞争机制.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 微RNAs (miRNAs) 是通过抑制mRNA翻译的基因表达的关键调节者.
- 在成熟过程中,前-miRNAs争夺Dicer酶,这是一个关键资源.
- 这种竞争对成熟miRNA表达水平的影响在很大程度上仍未被描述.
研究的目的:
- 调查Dicer的前miRNA竞争如何影响成熟miRNA的表达.
- 开发和验证一个计算模型,用于预-miRNA成熟动态.
- 探索前-miRNA-Dicer相互作用效率和TRBP协会在竞争中的作用.
主要方法:
- 使用体外Drosophila S2细胞数据开发了前-miRNA成熟的计算模型.
- 重新分析了ex vivo小鼠条纹体数据,Dicer1表达减少.
- 计算了对TRBP的miRNA前亲和力作为Dicer相互作用效率的代理.
主要成果:
- 有效的Dicer相互作用的前小RNA在Dicer稀缺下超过其他.
- TRBP关联强度准确地预测了小鼠条体数据中的成熟miRNA水平.
- 具有强烈TRBP关联的前miRNA在竞争场景中过度代表.
- 低成熟率的前miRNA也可以通过竞争影响成熟的miRNA池.
结论:
- 对于Dicer而言,预miRNA竞争是调节成熟miRNA组成的重要因素.
- 由TRBP介导的Dicer加载影响了前-miRNAs之间的竞争动态.
- 了解这些竞争机制对于破译miRNA调节至关重要.
相关概念视频
01:22MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
01:23RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:24Regulation 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...
01:22MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
01:22MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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...