Fold change of nuclear NF-κB determines TNF-induced transcription in single cells.
Mol Cell
; 53(6): 867-79, 2014 Mar 20.
Article
em En
| MEDLINE
| ID: mdl-24530305
ABSTRACT
In response to tumor necrosis factor (TNF), NF-κB enters the nucleus and promotes inflammatory and stress-responsive gene transcription. Because NF-κB deregulation is associated with disease, one might expect strict control of NF-κB localization. However, nuclear NF-κB levels exhibit considerable cell-to-cell variability, even in unstimulated cells. To resolve this paradox and determine how transcription-inducing signals are encoded, we quantified single-cell NF-κB translocation dynamics and transcription in the same cells. We show that TNF-induced transcription correlates best with fold change in nuclear NF-κB, not absolute nuclear NF-κB abundance. Using computational modeling, we find that an incoherent feedforward loop, from competition for binding to κB motifs, could provide memory of the preligand state necessary for fold-change detection. Experimentally, we observed three gene-specific transcriptional patterns that our model recapitulates by modulating competition strength alone. Fold-change detection buffers against stochastic variation in signaling molecules and explains how cells tolerate variability in NF-κB abundance and localization.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Transcrição Gênica
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RNA Mensageiro
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Modelos Estatísticos
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NF-kappa B
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Fator de Necrose Tumoral alfa
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article