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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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La ingeniería impulsada por modelos de dispositivos de ARN para programar cuantitativamente la expresión génica.

James M Carothers1, Jonathan A Goler, Darmawi Juminaga

  • 1California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley CA 94720, USA.

Science (New York, N.Y.)
|December 24, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los científicos desarrollaron un nuevo enfoque de diseño para la biología sintética utilizando modelos mecanicistas y simulaciones de plegamiento de ARN para diseñar controles de expresión génica. Este método permite una ingeniería predecible y precisa de dispositivos genéticos basados en ARN para diversas aplicaciones.

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Área de la Ciencia:

  • Biología sintética Biología sintética.
  • Biología molecular La biología molecular.
  • Ingeniería bioquímica de la ingeniería bioquímica.

Sus antecedentes:

  • Disponibilidad limitada de modelos y herramientas de simulación para el diseño de dispositivos biológicos sintéticos complejos.
  • Necesidad de métodos robustos para diseñar controles predecibles de la expresión génica.

Objetivo del estudio:

  • Formular un enfoque basado en el diseño para la ingeniería de dispositivos genéticos regulados por ARN.
  • Para permitir un control cuantitativamente predecible de la expresión génica utilizando componentes basados en ARN.

Principales métodos:

  • Se utilizaron modelos mecanicistas y simulaciones de plegamiento cinético de ARN.
  • Dispositivos de expresión ensamblados y caracterizados por ribozima, controlados por metabolitos y regulados por aptasazima.
  • Validar la estrategia de diseño a través de análisis in vitro, in vivo e in silico.

Principales resultados:

  • Ingeniería exitosa de 28 dispositivos de expresión de Escherichia coli.
  • Se logró un excelente acuerdo cuantitativo entre los niveles de expresión génica predichos y medidos (r = 0,94).
  • Aplicación demostrada de la tecnología para diseñar controles regulados por ARN en vías metabólicas.

Conclusiones:

  • El enfoque de diseño desarrollado proporciona un marco para el estudio de las funciones de ARN.
  • Destaca el potencial del modelado bioquímico y biofísico para el avance de los métodos de diseño biológico.
  • Permite la creación de sistemas biológicos sintéticos funcionalmente complejos y predeciblemente regulados.