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El agrupamiento nucleolar de genes de ARNt disperso

Martin Thompson¹, Rebecca A Haeusler, Paul D Good

¹Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109-0606, USA.

Science (New York, N.Y.)

|November 25, 2003

Resumen

En la levadura, los genes de ARN de transferencia (ARNt) se agrupan en el nucleolo, el sitio de la producción de ribosomas. Esta asociación nucleolar requiere una transcripción activa de genes, lo que afecta la organización del genoma y la regulación de los genes.

Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
Genética La genética.

Sus antecedentes:

El procesamiento temprano del ARN de transferencia (ARNt) en Saccharomyces cerevisiae ocurre en el núcleo.
El núcleo es principalmente conocido como el sitio de la biosíntesis del ribosoma.

Objetivo del estudio:

Para investigar si los genes de ARNt se agrupan en el núcleo.
Para determinar si esta organización espacial está vinculada a la transcripción.

Principales métodos:

Probando la ubicación subnuclear de cinco familias de genes de tRNA en la levadura.
Analizando el efecto de la inactivación del promotor en la asociación nucleolar.

Principales resultados:

Los genes de ARNt disperso se colocalizan con el ADN ribosomal 5S y el ARN nucleolar pequeño U14 en el núcleo.
La localización nucleolar depende de la formación del complejo de transcripción; la inactivación del promotor interrumpe esta asociación.

Conclusiones:

Los genes del tRNA están organizados en el nucleolo, lo que sugiere una disposición espacial coordinada de la vía de procesamiento del tRNA.
Esta organización del genoma puede influir en el empaquetado 3D del genoma y la regulación transcripcional.

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