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相关概念视频

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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...
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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...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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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...
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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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.
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miRNA模块用于精确,可调节的基因表达控制.

Rongrong Du1, Michael J Flynn1, Karan Mahe1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.

Molecular cell
|December 20, 2025
PubMed
概括

研究人员开发了基于miRNA的新型电路,称为DIMMERs,用于精确控制转基因表达. 这些调节器确保在不同基因剂量中均的蛋白质水平,推动基因疗法和生物技术研究.

关键词:
剂量补偿剂量补偿剂量补偿基因治疗的基因疗法这是一个微型RNA.多种规范性的法规.精确的基因表达控制.合成生物学 合成生物学

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科学领域:

  • 生物技术是生物技术.
  • 分子生物学分子生物学
  • 合成生物学 合成生物学

背景情况:

  • 精确控制转基因表达对于研究和治疗应用至关重要.
  • 基于微RNA (miRNA) 的调节电路为增强转基因控制提供了潜力.
  • 缺乏对miRNA电路设计原则和性能限制的系统理解.

研究的目的:

  • 介绍和描述基于miRNA的电路模块,称为"剂量不变miRNA介导表达调节器" (DIMMER).
  • 建立跨多种细胞类型的转基因表达的精确和可调节的控制.
  • 探索成像,基因编辑和基因治疗中的应用.

主要方法:

  • 结合计算建模和实验验证.
  • 在转基因电路内设计的多价值miRNA调节相互作用.
  • 测试了不同细胞类型和基因剂量的电路性能.

主要成果:

  • 尽管基因剂量有两个数量级的变化,但DIMMERs实现了几乎均的,可调节的蛋白质表达.
  • 电路在多种细胞类型中表现出功能,并使多重复合成为独立的基因调节.
  • DIMMERs成功地减少了非目标CRISPR基编辑,改善了单分子成像,并启用了AAV传递的转基因的实时跟踪.

结论:

  • DIMMERs为精确和可调节的转基因表达控制提供了一个强大的平台.
  • 这些调节电路在研究,生物技术和基因治疗中具有广泛的适用性.
  • DIMMERs克服了当前转基因表达调节方法的局限性.