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RNA Interference01:23

RNA Interference

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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.
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...
24.4K
Experimental RNAi02:15

Experimental RNAi

6.5K
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...
6.5K
siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

13.4K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
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Small interfering RNAs (siRNA)02:30

Small interfering RNAs (siRNA)

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Translational Regulation01:29

Translational Regulation

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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,...
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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Video Experimental Relacionado

Updated: May 6, 2026

MISSION esiRNA for RNAi Screening in Mammalian Cells
15:31

MISSION esiRNA for RNAi Screening in Mammalian Cells

Published on: May 12, 2010

18.8K

Modificadores de cadenas guía de ARN de interferencia corta provenientes del cribado computacional.

Kazumitsu Onizuka1, Jason G Harrison, Alexi A Ball-Jones

  • 1Department of Chemistry, University of California, Davis , One Shields Ave, Davis, California 95616, United States.

Journal of the American Chemical Society
|October 25, 2013
PubMed
Resumen
Este resumen es generado por máquina.

Las modificaciones químicas a los ARN de interferencia corta (siARN) mejoran su potencial farmacológico. Los investigadores descubrieron nuevas modificaciones funcionales para las hebras guía de siRNA, mejorando la eficiencia del silenciamiento de genes.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Descubrimiento de Drogas Descubrimiento de Drogas

Sus antecedentes:

  • Los ARN de interferencia corta (siRNA) son potentes agentes terapéuticos dirigidos a diversas enfermedades.
  • Las estructuras de ARN nativo presentan limitaciones para el desarrollo de fármacos de siRNA, lo que requiere modificaciones químicas.
  • La proteína humana Argonaute 2 (hAgo2) es central para la eficacia de la vía de interferencia de ARN (RNAi).

Objetivo del estudio:

  • Descubrir modificaciones químicas funcionales para el 5o extremo de las hebras guía del siRNA.
  • Para utilizar la detección computacional y los datos estructurales de hAgo2 para guiar el descubrimiento de modificaciones.
  • Ampliar la gama de análogos de nucleótidos para terapias mejoradas de siRNA.

Principales métodos:

  • Evaluación computacional guiada por la estructura de las posibles modificaciones del siRNA.
  • Utilizando la estructura de alta resolución del humano Ago2 (hAgo2).
  • Síntesis y prueba de bases 1,2,3-triazol-4-il y derivados de purinas en el ARN.

Principales resultados:

  • El nucleótido 5 eal-end de las hebras guía del siRNA requiere una complementariedad de forma adecuada en el sitio de unión hAgo2, no necesariamente en la unión H de Watson-Crick.
  • Las bases 1,2,3-Triazol-4-il, sintetizadas a través de la reacción CuAAC, son modificaciones efectivas en el siRNA 5 al final.
  • Se encontró que los derivados de purina con caras Hoogsteen modificadas o sustituyentes de N2 no eran adecuados para la modificación final.
  • Una base 1,2,3-triazol-4-il que carece de la capacidad de enlace H de Watson-Crick mostró eficacia en la posición 12 de la hebra guía.

Conclusiones:

  • Las modificaciones funcionales del siRNA se pueden descubrir a través de enfoques computacionales guiados por la estructura.
  • Los nuevos análogos de nucleótidos, como las bases 1,2,3-triazol-4-il, ofrecen nuevas posibilidades para el diseño de fármacos con siRNA.
  • Comprender las interacciones de hAgo2-siRNA es clave para desarrollar terapias de siRNA más efectivas.