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

Tracing Information Flow from Erk to Target Gene Induction Reveals Mechanisms of Dynamic and Combinatorial Control.
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DOI:
10.1016/j.molcel.2017.07.016
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发表时间:
2017-09-07
期刊:
影响因子:
16
通讯作者:
Toettcher JE
Toettcher JE
中科院分区:
生物学1区
文献类型:
--
作者:
Wilson MZ;Ravindran PT;Lim WA;Toettcher JE

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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 while 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 both by dynamic filters and logic gates to shape target gene responses in a context-specific manner. Signaling protein dynamics are widespread but their biological functions are poorly understood. In this issue of Molecular Cell, Wilson et al. use optogenetics to control Ras signaling while visualizing target gene responses, revealing dynamic and combinatorial control of gene expression.
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