Video Experimental Relacionado
Updated: Jul 9, 2025

08:40
Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
Published on: April 6, 2012
17.6K
SnapShot: degradación de miRNA dirigida hacia el objetivo
1Department of Pathology and Lab Medicine, Weill Cornell Medicine, New York, NY 10538, USA.
Cell
|December 8, 2023
Resumen
La degradación dirigida al objetivo (TDMD) describe cómo algunos microARN (miRNA) se destruyen después de unirse a objetivos inusuales. Este proceso es crucial para regular la expresión génica en virus y organismos modelo.
Área de la Ciencia:
- Biología molecular
- La genética
- Biología del ARN
Sus antecedentes:
- Los microARN (miRNA) son pequeños ARN no codificantes que regulan la expresión génica guiando a las proteínas argonautas (AGO) hacia los ARN mensajeros (mRNA).
- Por lo general, los complejos miRNA-AGO conducen a la represión traslacional o la escisión del mRNA.
- Una vía alternativa, la degradación dirigida al objetivo del miRNA (TDMD), da como resultado la destrucción del propio miRNA.
Objetivo del estudio:
- Para resumir la comprensión actual de los mecanismos moleculares subyacentes a la degradación dirigida al objetivo del miRNA (TDMD).
- Resaltar las funciones y funciones biológicas conocidas de la TDMD en diferentes organismos, incluidos los virus y los sistemas modelo.
Principales métodos:
- Este trabajo es una revisión y síntesis de la investigación existente, no un estudio experimental.
- Compila y analiza datos de la literatura publicada sobre la biogénesis, la función y las vías de degradación del miRNA.
Principales resultados:
- La TDMD es iniciada por interacciones específicas de miRNA-objetivo que difieren de la unión canónica de miRNA.
- El proceso implica el reclutamiento de factores específicos que conducen a la degradación del miRNA, a menudo a través de la actividad exonucleolítica de 5' a 3'.
- La TDMD se ha implicado en la defensa antiviral y la regulación de la expresión génica endógena en varios organismos.
Conclusiones:
- TDMD representa un mecanismo regulador significativo que expande las funciones conocidas de los ARN pequeños.
- Comprender la TDMD es crucial para comprender la regulación génica, la biología del ARN y el desarrollo de nuevas estrategias terapéuticas.
Videos de Conceptos Relacionados
MicroRNAs
3.0K
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...
3.0K
mRNA Stability and Gene Expression
5.6K
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
5.6K
Nuclear Export of mRNA
7.7K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
7.7K
Experimental RNAi
6.1K
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...
6.1K
RNA Interference
26.0K
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.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
26.0K
siRNA - Small Interfering RNAs
16.8K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.8K

