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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Mismatch Repair01:20

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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In vitro programmable DNA cleavage by a eukaryotic Argonaute.

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Video Experimental Relacionado

Updated: Jan 13, 2026

A Nonsequencing Approach for the Rapid Detection of RNA Editing
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Edición de ARN mediada por Argonaute para reparar selectivamente mutaciones puntuales

Zhiwei Zhang1, Jinyue Wang1, Tongyu Guo1

  • 1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei 430062, China.

Nucleic acids research
|January 7, 2026
PubMed
Resumen

Este estudio presenta McAgo, una nucleasa programable para la reducción y edición de ARN en células de mamíferos. Ofrece un control preciso de la expresión génica sin alterar el ADN, ampliando las funciones de las proteínas Argonaute.

Palabras clave:
ARNedición de ARNArgonauteMcAgoreducción de ARNterapias basadas en ARNbiotecnologíabiología molecularregulación génica

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Área de la Ciencia:

  • Biología Molecular
  • Regulación Génica
  • Biotecnología

Sus antecedentes:

  • La edición de ARN ofrece una regulación génica dinámica sin cambios genómicos permanentes.
  • Las proteínas Argonaute son clave en las vías de interferencia de ARN.

Objetivo del estudio:

  • Caracterizar McAgo de Monosporascus cannonballus para la orientación de ARN.
  • Evaluar el potencial de McAgo para la reducción y edición de ARN en células de mamíferos.

Principales métodos:

  • Caracterización de la actividad nucleasa de McAgo guiada por pequeños ARN.
  • Administración de complejos de ribonucleoproteínas (RNP) de McAgo en células de mamíferos.
  • Ensayos de edición de ARN in vitro utilizando un mutante de McAgo catalíticamente inactivo conjugado a la desaminasa hADAR2.

Principales resultados:

  • McAgo demostró una actividad robusta de clivaje de ARN a temperaturas fisiológicas.
  • Los complejos RNP de McAgo lograron una reducción de ARN endógeno >90% en células de mamíferos con baja respuesta inmune.
  • Un conjugado dMcAgo-hADAR2dd logró una eficiencia de edición de ARN de hasta el 90% in vitro.

Conclusiones:

  • McAgo se dirige eficazmente al ARN endógeno en células de mamíferos.
  • Este trabajo amplía la utilidad de las proteínas Argonaute para la reducción y edición de ARN.
  • Los hallazgos allanan el camino para nuevas estrategias terapéuticas basadas en ARN.