Video Experimental Relacionado
Updated: Aug 15, 2026

06:34
Virus-induced Gene Silencing (VIGS) in Nicotiana benthamiana and Tomato
Published on: June 10, 2009
La inhibición reversible de la senescencia de la fruta del tomate por el ARN antisense
P W Oeller1, M W Lu, L P Taylor
1Plant Gene Expression Center, University of California at Berkeley-United States Department of Agriculture, Albany 94710.
Resumen
El etileno es crucial para la maduración de la fruta. La inhibición de su producción en los tomates impide la maduración, pero la adición de etileno invierte esto, confirmando el etileno.
Área de la Ciencia:
- Biología vegetal Biología vegetal
- La bioquímica es la bioquímica.
- Biología molecular La biología molecular.
Sus antecedentes:
- El etileno es una hormona vegetal que regula la maduración de las frutas.
- La enzima 1-aminociclopropano-1-carboxilato sintasa es la que limita la velocidad en la biosíntesis del etileno.
Objetivo del estudio:
- Para investigar el papel del etileno en la maduración de la fruta del tomate.
- Para determinar si el etileno es un desencadenante o una consecuencia de la maduración.
Principales métodos:
- Utilizó ARN antisentido para inhibir la expresión de la 1-aminociclopropano-1-carboxilato sintasa en las plantas de tomate.
- Se administra etileno y propileno exógeno para observar los efectos en la maduración.
Principales resultados:
- El ARN antisense dirigido a la 1-aminociclopropano-1-carboxilato sintasa inhibió efectivamente la maduración de la fruta del tomate.
- La aplicación de etileno o propileno exógeno revirtió el efecto inhibidor, restaurando la maduración.
Conclusiones:
- El etileno actúa como un disparador primario para la maduración de la fruta, no simplemente como un subproducto.
- La manipulación de los niveles de etileno ofrece el potencial para extender la vida útil de los tejidos vegetales y reducir el deterioro.
Más Videos Relacionados
Videos de Conceptos Relacionados
Feedback Inhibition
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
RNA Interference
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...
Riboswitches
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.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
siRNA - Small Interfering RNAs
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 ATP-dependent...
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 ATP-dependent...
Experimental RNAi
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...
Transcriptional Regulation: Riboswitches
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...

