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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...
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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...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Updated: Apr 15, 2026

A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues
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A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues

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La N6-metiladenosina marca los microARN primarios para su procesamiento.

Claudio R Alarcón1, Hyeseung Lee1, Hani Goodarzi1

  • 1Laboratory of Systems Cancer Biology, Rockefeller University, 1230 York Avenue, New York, New York 10065, USA.

Nature
|March 25, 2015
PubMed
Resumen
Este resumen es generado por máquina.

La metiltransferasa tipo 3 (METTL3) agrega una marca m(6)A a los pri-miARN, lo que permite el reconocimiento de DGCR8 y el procesamiento de microARN. Esta modificación es esencial para la biogénesis de miRNA y los niveles globales de miRNA.

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Área de la Ciencia:

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

Sus antecedentes:

  • La biogénesis del microARN (miRNA) se inicia con el procesamiento del miRNA primario (pri-miRNA) por el complejo de microprocesadores (DGCR8/DROSHA).
  • El mecanismo preciso del reconocimiento DGCR8 de pri-miRNAs sobre otras estructuras de ARN sigue sin estar claro.

Objetivo del estudio:

  • Para aclarar el mecanismo por el cual DGCR8 reconoce y se une pri-miRNAs.
  • Identificar los factores que regulan el paso inicial de la biogénesis del miRNA.

Principales métodos:

  • Experimentos celulares que involucran el agotamiento de METTL3 y la ganancia de función.
  • Análisis bioquímicos que incluyen reacciones de procesamiento in vitro.
  • Análisis de los niveles de pri-miRNA y miRNA maduro.

Principales resultados:

  • METTL3 metila los pri-miRNAs en el sitio N(6) -metiladenosina (m(6) A, marcando su unión a DGCR8.
  • El agotamiento de METTL3 reduce la interacción DGCR8-pri-miRNA, lo que lleva a una disminución del miRNA maduro y un aumento de los niveles de pri-miRNA.
  • Los estudios in vitro confirman m(6) Una suficiencia para el procesamiento de pri-miRNA; METTL3 mejora la maduración del miRNA a nivel mundial.

Conclusiones:

  • La modificación m(6)A, mediada por METTL3, es un regulador post-transcripcional crítico que promueve el reconocimiento y procesamiento de pri-miRNA por DGCR8.
  • Este hallazgo revela un nuevo mecanismo que controla el inicio de la biogénesis del miRNA.