HIF1A employs CDK8-mediator to stimulate RNAPII elongation in response to hypoxia.
Cell
; 153(6): 1327-39, 2013 Jun 06.
Article
en En
| MEDLINE
| ID: mdl-23746844
The transcription factor HIF1A is a key mediator of the cellular response to hypoxia. Despite the importance of HIF1A in homeostasis and various pathologies, little is known about how it regulates RNA polymerase II (RNAPII). We report here that HIF1A employs a specific variant of the Mediator complex to stimulate RNAPII elongation. The Mediator-associated kinase CDK8, but not the paralog CDK19, is required for induction of many HIF1A target genes. HIF1A induces binding of CDK8-Mediator and the super elongation complex (SEC), containing AFF4 and CDK9, to alleviate RNAPII pausing. CDK8 is dispensable for HIF1A chromatin binding and histone acetylation, but it is essential for binding of SEC and RNAPII elongation. Global analysis of active RNAPII reveals that hypoxia-inducible genes are paused and active prior to their induction. Our results provide a mechanistic link between HIF1A and CDK8, two potent oncogenes, in the cellular response to hypoxia.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
ARN Polimerasa II
/
Hipoxia de la Célula
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Subunidad alfa del Factor 1 Inducible por Hipoxia
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Complejo Mediador
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Quinasa 8 Dependiente de Ciclina
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Elongación de la Transcripción Genética
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Neoplasias
Límite:
Humans
Idioma:
En
Revista:
Cell
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos