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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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SnapShot: Sistemas CRISPR-Cas de clase 2

Kira S Makarova1, Feng Zhang2, Eugene V Koonin1

  • 1National Center for Biotechnology Information, National Institutes of Health, Bethesda, MD 20894, USA.

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Los sistemas CRISPR-Cas de clase 2 utilizan proteínas grandes de un solo efector originadas en elementos genéticos móviles. Las proteínas clave como Cas9 y Cas12a son ahora herramientas vitales para aplicaciones de ingeniería genómica.

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • Microbiología

Sus antecedentes:

  • Los sistemas CRISPR-Cas de clase 2 poseen módulos efectores únicos compuestos por proteínas grandes, individuales y multidominio.
  • Se supone que estas proteínas efectoras se originan a partir de elementos genéticos móviles, lo que sugiere la transferencia horizontal de genes.
  • Los orígenes estructurales y evolutivos de estos sistemas son de gran interés en la biología molecular.

Objetivo del estudio:

  • Resaltar las características definitorias de los sistemas CRISPR-Cas de clase 2.
  • Para discutir los orígenes evolutivos de las proteínas efectoras de Clase 2.
  • Para subrayar la reutilización exitosa de estos sistemas para la ingeniería genómica.

Principales métodos:

  • Análisis bioinformático de las estructuras del sistema CRISPR-Cas.
  • Genómica comparativa para rastrear la historia evolutiva de las proteínas efectoras.
  • Revisión de la literatura de las aplicaciones del sistema CRISPR-Cas en ingeniería genómica.

Principales resultados:

  • Los sistemas de clase 2 están definidos por efectores grandes de una sola proteína, distintos de los sistemas de clase 1 de múltiples subunidades.
  • La evidencia sugiere que estas proteínas efectoras evolucionaron a partir de elementos genéticos móviles.
  • Las proteínas específicas de la Clase 2, especialmente Cas9 y Cas12a (Cpf1), han demostrado una alta eficacia en la edición del genoma.

Conclusiones:

  • Los sistemas CRISPR-Cas de clase 2 representan un linaje evolutivo distinto dentro de la inmunidad adaptativa de las procariotas.
  • El carácter modular y el origen del elemento móvil de los efectores de clase 2 facilitan su aplicación biotecnológica.
  • Cas9 y Cas12a son ejemplos del potencial de los componentes CRISPR-Cas reutilizados para la ingeniería genómica precisa.