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David Burstein1, Lucas B Harrington2, Steven C Strutt2

  • 1Department of Earth and Planetary Sciences, University of California, Berkeley, California 94720, USA.

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Los investigadores descubrieron nuevos sistemas CRISPR-Cas, incluido el Cas9 arqueal y el CasX / CasY bacteriano compacto, mediante el análisis de microbios no cultivados. Esto amplía el conjunto de herramientas para aplicaciones revolucionarias de investigación biológica y clínica.

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Área de la Ciencia:

  • Microbiología
  • Biología molecular
  • Biotecnología

Sus antecedentes:

  • Los sistemas CRISPR-Cas otorgan inmunidad adaptativa a los microbios a través de la escisión de proteínas guiadas por ADN.
  • Los sistemas CRISPR-Cas de clase 2 utilizan una sola proteína Cas unida al ARN para el reconocimiento y la escisión del objetivo.
  • Las tecnologías CRISPR actuales utilizan principalmente sistemas bacterianos, dejando muchas enzimas de organismos no cultivados sin explorar.

Objetivo del estudio:

  • Explorar el material genético de organismos no cultivados utilizando la metagenómica para descubrir nuevos sistemas CRISPR-Cas.
  • Identificar nuevas variantes de CRISPR-Cas, incluidos los sistemas bacterianos arqueos y compactos de Cas9.
  • Validar la funcionalidad de los sistemas recién descubiertos in vivo.

Principales métodos:

  • La metagenómica resuelta por genoma se empleó para analizar el ADN de las comunidades microbianas naturales.
  • El análisis bioinformático se utilizó para identificar los sistemas CRISPR-Cas dentro de los genomas secuenciados.
  • Se realizaron experimentos in vivo en Escherichia coli para validar la actividad de interferencia del ADN guiada por ARN.

Principales resultados:

  • Identificación de nuevos sistemas CRISPR-Cas, incluido el primer Cas9 en Archaea desde nanoarchaea.
  • El descubrimiento de dos sistemas bacterianos compactos, CRISPR-CasX y CRISPR-CasY.
  • Validación exitosa de la interferencia del ADN guiada por ARN in vivo para los sistemas identificados.

Conclusiones:

  • La metagenómica proporciona acceso a una gran diversidad de genomas microbianos no cultivados y sus sistemas CRISPR-Cas.
  • El descubrimiento de nuevos sistemas CRISPR-Cas amplía el repertorio de herramientas para la investigación biológica y clínica.
  • Este trabajo destaca el potencial de explorar las comunidades microbianas ambientales para los avances biotecnológicos.