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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...
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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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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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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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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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相关实验视频

Updated: May 5, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
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由于细胞微RNA/短毛RNA路径过度和,导致小鼠死亡.

Dirk Grimm1, Konrad L Streetz, Catherine L Jopling

  • 1Stanford University, School of Medicine, Department of Pediatrics, Stanford, California 94305, USA.

Nature
|May 26, 2006
PubMed
概括
此摘要是机器生成的。

在小鼠肝脏中,高水平的短发针RNA (shRNA) 表达会通过干扰microRNAs (miRNAs) 引起剂量依赖的损伤和死亡. 优化shRNA传递对于安全的RNA干扰 (RNAi) 疗法至关重要.

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学 是一个
  • 生物技术是生物技术.

背景情况:

  • RNA干扰 (RNAi) 是一种天然的基因沉默过程.
  • 短发针RNA (shRNA) 可以诱导RNAi用于研究和治疗.
  • 腺相关病毒8型 (AAV8) 载体可以将shRNA传递给肝细胞.

研究的目的:

  • 为了研究在老鼠肝脏中持续高水平的shRNA表达的长期影响.
  • 评估基于AAV8的shRNA传递系统的安全性和有效性.
  • 了解shRNA诱导的毒性背后的分子机制.

主要方法:

  • 系统评估49个不同的AAV/shRNA载体,针对成年小鼠的6个基因.
  • 用于shRNA输送的AAV8载体的静脉输注.
  • 在体外和体内传染研究以确定共享的细胞因子.

主要成果:

  • 在49个AAV/shRNA载体中,36个导致了剂量依赖的肝损伤,其中23个导致死亡.
  • 患病率与肝脏微RNAs (miRNAs) 的下调相关.
  • 埃克斯波丁-5被确定为由shRNA和miRNA通路和的细胞限制因素.

结论:

  • 持续高水平的shRNA表达可以通过干扰内源性miRNA处理引起显著的毒性.
  • 控制shRNA表达水平对于基于RNAi的疗法的安全性至关重要.
  • 优化的shRNA剂量和序列可以将风险降到最低,并使治疗应用成为可能,例如治疗乙型肝炎病毒.