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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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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...
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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...
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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Módulos de miRNA para control preciso y sintonizable de la expresión génica

Rongrong Du1, Michael J Flynn1, Karan Mahe1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.

Molecular cell
|December 20, 2025
PubMed
Resumen

Los investigadores desarrollaron novedosos circuitos basados en miRNA llamados DIMMERs para el control preciso de la expresión de transgenes. Estos reguladores garantizan niveles uniformes de proteínas en dosis génicas variables, avanzando en la investigación de terapia génica y biotecnología.

Palabras clave:
compensación de dosisterapia génicamicroARNregulación multiespecíficacontrol preciso de la expresión génicabiología sintética

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Área de la Ciencia:

  • Biotecnología
  • Biología Molecular
  • Biología Sintética

Sus antecedentes:

  • El control preciso de la expresión de transgenes es crucial para aplicaciones de investigación y terapéuticas.
  • Los circuitos reguladores basados en microARN (miARN) ofrecen potencial para un control mejorado de transgenes.
  • Falta una comprensión sistemática de los principios de diseño de circuitos de miARN y los límites de rendimiento.

Objetivo del estudio:

  • Introducir y caracterizar módulos de circuitos basados en miRNA, denominados "reguladores de expresión mediados por miRNA de dosis invariante" (DIMMERs).
  • Establecer un control preciso y sintonizable de la expresión de transgenes en diversos tipos de células.
  • Explorar aplicaciones en imagenología, edición génica y terapia génica.

Principales métodos:

  • Combinación de modelado computacional y validación experimental.
  • Diseño de interacciones reguladoras de miARN multivalentes dentro de circuitos de transgenes.
  • Prueba del rendimiento del circuito en diferentes tipos de células y dosis génicas.

Principales resultados:

  • Los DIMMERs logran una expresión de proteínas casi uniforme y sintonizable a pesar de una variación de dos órdenes de magnitud en la dosis génica.
  • Los circuitos demuestran funcionalidad en diversos tipos de células y permiten la multiplexación para la regulación génica independiente.
  • Los DIMMERs redujeron con éxito la edición de bases CRISPR fuera del objetivo, mejoraron la imagen molecular única y permitieron el seguimiento en vivo de transgenes entregados por AAV.

Conclusiones:

  • Los DIMMERs proporcionan una plataforma robusta para el control preciso y sintonizable de la expresión de transgenes.
  • Estos circuitos reguladores tienen una amplia aplicabilidad en investigación, biotecnología y terapia génica.
  • Los DIMMERs superan las limitaciones en los métodos actuales de regulación de la expresión de transgenes.