ArticleCell reports2025
A live-cell biosensor of in vivo receptor tyrosine kinase activity reveals feedback regulation of a developmental gradient.
Article in Cell reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- The regulatory logic of a dose-dependent developmental fate decision.bioRxiv : the preprint server for biology · 2026Article
- Lights up on the embryonic dance: tools and applications of optogenetics in developmental biology.Genes & development · 2026Review
- A Chemically Inducible Multimerization System for Tunable and Background-Free RTK Activation.Analytical chemistry · 2026Article
- A chemically inducible multimerization system for tunable and background-free RTK activation.bioRxiv : the preprint server for biology · 2025Article
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Abstract
A lack of tools for detecting receptor activity in vivo has limited our ability to fully explore receptor-level control of developmental patterning. Here, we extend phospho-tyrosine tag (pYtag) biosensors to visualize endogenous receptor tyrosine kinase (RTK) activity in Drosophila. We build biosensors for three RTKs that function across developmental stages and tissues. By characterizing Torso::pYtag during embryonic terminal patterning, we find that Torso activity differs from downstream extracellular signal-regulated kinase (ERK) activity in two surprising ways: Torso activity is narrowly restricted to the poles but produces a broader gradient of ERK and decreases over developmental time, while ERK activity is sustained, an effect mediated by ERK pathway-dependent negative feedback. Our results suggest that a narrow domain of Torso activity, tuned in amplitude by negative feedback, locally activates signaling effectors, which diffuse through the syncytial embryo to form the ERK gradient. Altogether, the results of this work highlight the usefulness of pYtags for investigating receptor-level regulation of developmental patterning.
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