Tracing Information Flow from Erk to Target Gene Induction Reveals Mechanisms of Dynamic and Combinatorial Control

Maxwell Z. Wilson, Pavithran T. Ravindran, Wendell A. Lim, Jared E. Toettcher

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Cell signaling networks coordinate specific patterns of protein expression in response to external cues, yet the logic by which signaling pathway activity determines the eventual abundance of target proteins is complex and poorly understood. Here, we describe an approach for simultaneously controlling the Ras/Erk pathway and monitoring a target gene's transcription and protein accumulation in single live cells. We apply our approach to dissect how Erk activity is decoded by immediate early genes (IEGs). We find that IEG transcription decodes Erk dynamics through a shared band-pass filtering circuit; repeated Erk pulses transcribe IEGs more efficiently than sustained Erk inputs. However, despite highly similar transcriptional responses, each IEG exhibits dramatically different protein-level accumulation, demonstrating a high degree of post-transcriptional regulation by combinations of multiple pathways. Our results demonstrate that the Ras/Erk pathway is decoded by both dynamic filters and logic gates to shape target gene responses in a context-specific manner.

Original languageEnglish (US)
Pages (from-to)757-769.e5
JournalMolecular Cell
Volume67
Issue number5
DOIs
StatePublished - Sep 7 2017

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cell Biology

Keywords

  • Erk
  • MAP kinase
  • cell signaling
  • dynamics
  • immediate early genes
  • optogenetics
  • signal processing
  • transcription regulation

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