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Las nuevas variantes de CRISPR-Cas9 (SpCas9-HF1 y eSpCas9 ((1.1)) muestran una reducción de los efectos fuera del objetivo. Se desarrolló una nueva variante hiperprecisa (HypaCas9), que mejora la especificidad de la edición del genoma sin perder actividad en el objetivo.

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • La bioquímica

Sus antecedentes:

  • El sistema CRISPR-Cas9 de Streptococcus pyogenes (SpCas9) es una herramienta poderosa para la edición del genoma.
  • Las variantes de alta fidelidad existentes (SpCas9-HF1, eSpCas9(1.1) reducen la escisión fuera del objetivo, pero sus mecanismos de discriminación del objetivo siguen sin estar claros.
  • Se necesitan mejoras adicionales en la especificidad de Cas9 para la ingeniería genómica precisa.

Objetivo del estudio:

  • Aclarar el mecanismo subyacente a la discriminación de objetivos en las variantes SpCas9.
  • Diseñar una nueva variante de Cas9 con mayor especificidad y actividad mantenida en el objetivo.
  • Desarrollar un modelo refinado para el reconocimiento de objetivos Cas9 y la activación de la nucleasa.

Principales métodos:

  • Se emplearon experimentos de transferencia de energía de resonancia de Förster (smFRET) de una sola molécula para estudiar las variantes de SpCas9.
  • Se utilizaron técnicas biofísicas para analizar la unión al objetivo y los cambios conformacionales.
  • Se diseñó y probó una nueva variante de Cas9, HypaCas9, para la especificidad de todo el genoma y la actividad en el objetivo.

Principales resultados:

  • SpCas9-HF1 y eSpCas9(1.1) adoptan estados inactivos cuando se unen objetivos de ADN no coincidentes.
  • El dominio REC3 de Cas9 juega un papel crítico en el reconocimiento de la complementariedad del objetivo y el control de la actividad de la nucleasa.
  • La variante HypaCas9 recientemente diseñada exhibe una especificidad superior en todo el genoma y una robusta edición en el objetivo en células humanas.

Conclusiones:

  • El dominio REC3 es un regulador clave de la competencia catalítica de Cas9 basado en la coincidencia del ADN objetivo.
  • La comprensión de este mecanismo permite el diseño racional de herramientas CRISPR-Cas9 más precisas.
  • HypaCas9 representa un avance significativo en las tecnologías de edición de genoma de precisión.