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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 ends...
MicroRNAs01:22

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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 ends...
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Updated: Jun 23, 2026

MicroRNA-based Regulation of Picornavirus Tropism
09:05

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Published on: February 6, 2017

microARN: diminutos reguladores con un gran potencial.

V Ambros1

  • 1Department of Genetics, Dartmouth Medical School, Hanover, NH 03755, USA. vra@dartmouth.edu

Cell
|January 10, 2002
PubMed
Resumen
Este resumen es generado por máquina.

Los pequeños ARN reguladores, conocidos como microARN, son abundantes en los genomas animales. Su diversidad y presencia generalizada sugieren roles cruciales en varias vías de regulación genética.

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Área de la Ciencia:

  • La genómica es la genómica.
  • Biología Molecular Biología Molecular
  • ARN Biología Biología ARN

Sus antecedentes:

  • Los genomas de los animales codifican numerosos genes pequeños.
  • Estos genes producen ARN reguladores de aproximadamente 22 nucleótidos de longitud.
  • Estos pequeños ARN se identifican como microARN.

Objetivo del estudio:

  • Para investigar las características de los microARN.
  • Comprender las funciones potenciales de los microARN en la regulación genética.

Principales métodos:

  • Análisis bioinformático de genomas de animales.
  • Análisis de secuencias de ARN pequeños.
  • Genómica comparativa para evaluar la distribución evolutiva.

Principales resultados:

  • Los microARN son diversos en sus secuencias de nucleótidos.
  • Los microARN exhiben patrones de expresión variados en diferentes tejidos o condiciones.
  • Se ha descubierto que los microARN están evolucionariamente extendidos entre las especies animales.

Conclusiones:

  • La diversidad de secuencias y la amplia presencia evolutiva de microARN indican importantes funciones biológicas.
  • Es probable que los microARN jueguen un papel crítico en una amplia gama de redes reguladoras genéticas.
  • Se requiere más investigación sobre la función del microARN para dilucidar su impacto en la expresión génica y los procesos celulares.