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RNAi Screening to Identify Postembryonic Phenotypes in C. elegans
Published on: February 13, 2012
El RNAi sistémico en C. elegans requiere la proteína transmembrana putativa SID-1
William M Winston1, Christina Molodowitch, Craig P Hunter
1Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.
Science (New York, N.Y.)
|February 9, 2002
Resumen
La interferencia de ARN de doble hebra (RNAi) en C. elegans difunde la información de silenciamiento de genes entre las células. La proteína SID-1 es esencial para esta transmisión sistémica de RNAi, actuando de forma celular autónoma.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La interferencia génica mediada por ARN de doble cadena (RNAi) es una herramienta poderosa para inhibir la expresión génica en el nematodo Caenorhabditis elegans.
- El RNAi sistémico permite que el silenciamiento de genes se extienda por todo el organismo, pero los mecanismos de transmisión de información entre las células siguen sin estar claros.
Objetivo del estudio:
- Investigar los mecanismos celulares y moleculares subyacentes a la transmisión sistémica de las señales de silenciamiento de RNAi en C. elegans.
- Para identificar los loci genéticos involucrados en la propagación intercelular de los efectos del ARNi.
Principales métodos:
- Construcción de una cepa de C. elegans para visualizar el ARNi sistémico.
- Cribado genético para identificar mutantes sistémicos con deficiencia de interferencia de ARN (lado).
- Caracterización molecular de genes identificados, incluyendo clonación de genes y estudios de localización de proteínas.
Principales resultados:
- Identificación de varios sid loci requeridos para la propagación sistémica del ARNi.
- El locus sid-1 codifica una proteína transmembrana conservada, SID-1.
- SID-1 se expresa en las células sensibles al ARNi, localizadas en la periferia celular, y funciona de forma celular autónoma para mediar el ARNi sistémico.
Conclusiones:
- La proteína SID-1 juega un papel crucial en la transmisión de célula a célula de la información de silenciamiento de genes durante el RNAi sistémico en C. elegans.
- SID-1 representa un componente clave de la vía responsable de la propagación de los efectos del ARNi entre los tejidos.
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