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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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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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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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A Rapid and Facile Pipeline for Generating Genomic Point Mutants in C. elegans Using CRISPR/Cas9 Ribonucleoproteins
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CRISPR muy rápido bajo demanda

Yang Liu1, Roger S Zou2, Shuaixin He3

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University, Baltimore, MD, USA. tjha@jhu.edu bwu20@jhu.edu.

Science (New York, N.Y.)
|June 13, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Desarrollamos muy rápidamente CRISPR (vfCRISPR), una herramienta de edición de genoma activada por luz. Este método controla con precisión las rupturas de doble cadena de ADN para estudios de alta resolución de la dinámica de reparación del ADN.

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • Biotecnología

Sus antecedentes:

  • Los sistemas CRISPR-Cas son potentes herramientas de edición del genoma.
  • Se necesita un control temporal preciso de la escisión del ADN para estudios detallados de los mecanismos de reparación del ADN.

Objetivo del estudio:

  • Desarrollar un sistema CRISPR-Cas9 inducible por luz para el análisis espacio-temporal de alta resolución de la reparación del ADN.
  • Para investigar la cinética y los eventos moleculares de la reparación de la ruptura de doble cadena de ADN.

Principales métodos:

  • Desarrolló una estrategia de ARN enjaulado para la unión y escisión de Cas9 activado por luz (vfCRISPR).
  • Se utilizaron imágenes de fluorescencia de una sola célula para controlar los focos de reparación del ADN (por ejemplo, 53BP1) y la dinámica de las proteínas (por ejemplo, MRE11).
  • Se midió la propagación de la fosforilación H2AX como marcador de la respuesta al daño del ADN.

Principales resultados:

  • vfCRISPR permite la inducción rápida y sincronizada de ruptura de doble cadena de ADN en las escalas de segundo y submicrómetro.
  • Respuestas celulares observadas al daño del ADN en cuestión de minutos, incluida la retención de MRE11 después de la ligadura.
  • Caracterizó la cinética de la propagación de la fosforilación H2AX y la dinámica de los focos de reparación 53BP1.
  • Manipulación genómica de un solo alelo guiada por imágenes.

Conclusiones:

  • vfCRISPR proporciona una resolución espacial sin precedentes para el estudio de la reparación del ADN.
  • El sistema permite un análisis cinético detallado de las vías de respuesta al daño del ADN.
  • Permite la manipulación genómica precisa para la investigación biológica avanzada.