Volume 67, Issue 5, Pages e5 (September 2017)

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Volume 67, Issue 5, Pages 757-769.e5 (September 2017) 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  Molecular Cell  Volume 67, Issue 5, Pages 757-769.e5 (September 2017) DOI: 10.1016/j.molcel.2017.07.016 Copyright © 2017 Elsevier Inc. Terms and Conditions

Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 1 A Global Map of Ras-Induced Transcriptional Dynamics (A) Schematic of an idealized system for connecting signaling dynamics to gene expression, implementing both controlled inputs and live-cell reporters at multiple nodes. (B) To determine PDGF- and Ras-specific transcriptomes, NIH 3T3 OptoSOS cells were stimulated with PDGF or activating light and subjected to RNA-seq analysis. (C and D) Comparison of transcript abundance between unstimulated cells and 30 min of light-activated Ras (C) or between 30 min of PDGF and 30 min of light (D). Genes that were upregulated at any time point are colored red. (E) Transcript abundance for all upregulated genes, normalized to each gene’s maximal expression condition. Genes were hierarchically clustered using Ward’s method. See also Figure S1. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 2 A System for Profiling Ras/Erk Control of IEGs in Single Live Cells (A) Schematic overview of all-optical input-output system. Dynamic Ras stimuli can be delivered by illuminating OptoSOS cells with red/infrared light. Ras pathway activity, target gene transcription, and target protein accumulation are inferred from BFP-Erk localization, MCP-mCherry nuclear foci, and msfYFP expression, respectively. (B) Co-transfection of Cas9 with an appropriate gRNA (guide RNA) and the msfYFP-MS2(24X) flanked by homology to the genomic cut site induces stable integration of the msfYFP-MS2 tag at an endogenous genomic locus. (C) Fold change of expression profiles for each IEG tagged using the approach in (B). (D) Images of msfYFP expression for each genomically tagged IEG used in this study. Red box indicates tags that are mislocalized or exhibit fluorescent protein cleavage. See also Figure S2. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 3 Visualizing Signal Transmission through the Central Dogma (A) Nuclear BFP-Erk (left), MCP-mCherry transcriptional foci (middle), and RhoB-msfYFP protein accumulation (right) in response to a sequence of red and infrared light inputs applied to OptoSOS-RhoB cells. (B) Representative images before and after light stimulation for the cell quantified in (A). Note the appearance of two foci (red arrows) corresponding to the rhob expression from both genomic loci. (C) Sustained light stimulation of all five OptoSOS-IEG cell lines. Curves indicate mean ± SEM of nuclear BFP Erk translocation (left), MCP-mCherry nuclear focus intensity (middle), and msfYFP-IEG protein accumulation (right) from at least 20 cells per panel. (D) Delay times (mean ± SEM) between maximum instantaneous nuclear BFP-Erk accumulation and peak target gene activation. (E) The amplitude of transcriptional foci (mean ± SEM) after light stimulation plotted against the 3′ UTR length for each IEG. Dotted line indicates linear fit. (F) Quantification of cytoplasmic Btg2-YFP in cells treated with Dox or PDGF. Mean ± SEM are shown. See also Figure S3. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 4 Organelle-Specific Dephosphorylation of Nuclear Erk Drive Transcriptional Adaptation (A–D) Quantification of MCP-mCherry nuclear foci (mean ± SEM) over time in OptoSOS-RhoB cells after light stimulation. Cells were stimulated with cycloheximide (CHX) or vehicle control (A), light with or without pre-treatment with PDGF (B), PDGF with or without pretreatment with light (C), and sequential stimulation with light and 10% fetal bovine serum (D). (E) Images of dpErk localization in the OptoSOS chassis cell line after light stimulation and in the presence or absence of CHX. Images show fluorescent histone H2B-diRFP (left), antibody staining for dpErk (middle), and BFP-Erk2 localization (right). (F) Nuclear and cytoplasmic dpErk quantified over time after light stimulation (mean ± SEM), with or without CHX. (G) MCP-mCherry nuclear focus intensity (mean ± SEM) in cells transduced with BFP-Erk2 D319N (blue) or BFP-Erk2 (red). (H) Negative feedback on nuclear Erk can be blocked by translation inhibition and reduced by expression of Erk D319N. See also Figure S4. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 5 Adaptation of IEG Transcription Implements a Bandpass Filter of Dynamic Erk Activity (A) Mathematical model of Erk-induced transcription. Schematic representation of interactions simulated using equations representing nuclear dpErk, dusp mRNA, Dusp protein, and IEG transcripts with differing sensitivities to Erk. (B) Simulations showing adaptation of transcription under continuous light (top) but repeated bouts of transcription in response to intermittent light pulses (bottom). (C) Simulations showing decreased transcription if the frequency of light pulses is too high (top) or low (bottom). (D) Simulated total transcript production as a function of tOFF for target genes with different sensitivities to Erk (Ki). Each curve is normalized to its peak output. (E) Images of transcriptional foci (top; white arrows) and quantified MCP-mCherry nuclear focus intensity (bottom) of a representative OptoSOS-RhoB cell demonstrating repeated responses to optimally spaced input pulses. (F) Quantification of MCP-mCherry nuclear focus intensity (mean ± SEM) during time courses as in (E), where cells were subjected to 20 min activating light pulses separated by inactivating light pulses lasting from 4 to 384 min. See also Figure S5. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions

Figure 6 IEGs Are Regulated by Dynamic and Combinatorial Control Our study suggests a two-tiered scheme for IEG regulation. First, IEG transcription is dynamically controlled by the Ras/Erk pathway. Long-term Erk inputs lead to adaptation of IEG transcription, whereas periodic Erk stimuli lead to repeated cycles of transcriptional induction. Second, IEG protein production is combinatorially controlled. Two stimuli that both elicit transcription can have differential protein-level outcomes, demonstrating that different pathway inputs control both transcriptional and post-transcriptional steps. Molecular Cell 2017 67, 757-769.e5DOI: (10.1016/j.molcel.2017.07.016) Copyright © 2017 Elsevier Inc. Terms and Conditions