Video Experimental Relacionado
Updated: Dec 19, 2025
10:28
Author Spotlight: RNAi Inheritance and ChIP in C. elegans
Published on: May 5, 2023
4.5K
ARN de cola poli (UG) en la protección del genoma y la herencia epigenética
Aditi Shukla1, Jenny Yan1, Daniel J Pagano1
1Department of Genetics, Blavatnik Institute at Harvard Medical School, Boston, MA, USA.
Nature
|June 6, 2020
Resumen
La ribonucleotidiltransferasa RDE-3 agrega colas poli (UG) a los ARN, lo que permite el silenciamiento genético y la herencia epigenética transgeneracional en C. elegans.
Área de la Ciencia:
- La genética
- Biología molecular
- La epigenética
Sus antecedentes:
- Los elementos genéticos móviles representan una amenaza para la integridad del genoma.
- RDE-3 (MUT-2) es una ribonucleotidiltransferasa crucial para el silenciamiento del transposón y la interferencia del ARN en C. elegans.
- RDE-3 puede agregar colas poli (UG) a los ARN en sistemas heterólogos.
Objetivo del estudio:
- Investigar el papel de RDE-3 en su contexto natural en C. elegans.
- Aclarar el mecanismo por el cual RDE-3 contribuye al silenciamiento de genes y la herencia epigenética.
Principales métodos:
- Se estudió la actividad de RDE-3 en C. elegans.
- Se analizó el efecto de las colas de poli (UG) en la orientación del ARN.
- Investigó el reclutamiento de polimerasas de ARN dependientes de ARN y la síntesis de ARN si.
Principales resultados:
- RDE-3 agrega colas poli (UG) a los ARN del transposón y objetivos de interferencia de ARN en C. elegans.
- Las colas poli (UG) de más de 16 nucleótidos U-G alternados confieren propiedades silenciadoras de genes.
- Las colas pUG reclutan polimerasas de ARN dependientes de ARN, lo que lleva a la síntesis de siRNA y la herencia epigenética transgeneracional.
Conclusiones:
- Un bucle de silenciamiento de ARN-siARN pUG impulsa la herencia epigenética transgeneracional dirigida por ARN de doble cadena en la línea germinal de C. elegans.
- Este mecanismo puede servir para proteger a la descendencia de los elementos genéticos parásitos.
Videos de Conceptos Relacionados
01:53RNA Stability
35.4K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.4K
02:57piRNA - Piwi-interacting RNAs
7.4K
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
7.4K
01:37Epigenetic Regulation
3.6K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.6K
01:46Epigenetic Regulation
33.3K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
33.3K
01:23Types of RNA
72.2K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
72.2K
01:20Types of RNA
8.6K
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
8.6K