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Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo

Positional information in developing tissues often takes the form of stripes of gene expression that mark the boundaries of a particular cell type or morphogenetic process. How stripes form is still in many cases poorly understood. Here we use optogenetics and live-cell biosensors to investigate one...

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Autores principales: Ho, Emily K., Oatman, Harrison R., McFann, Sarah E., Yang, Liu, Johnson, Heath E., Shvartsman, Stanislav Y., Toettcher, Jared E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cold Spring Harbor Laboratory 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10028984/
https://www.ncbi.nlm.nih.gov/pubmed/36945584
http://dx.doi.org/10.1101/2023.03.09.531972
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author Ho, Emily K.
Oatman, Harrison R.
McFann, Sarah E.
Yang, Liu
Johnson, Heath E.
Shvartsman, Stanislav Y.
Toettcher, Jared E.
author_facet Ho, Emily K.
Oatman, Harrison R.
McFann, Sarah E.
Yang, Liu
Johnson, Heath E.
Shvartsman, Stanislav Y.
Toettcher, Jared E.
author_sort Ho, Emily K.
collection PubMed
description Positional information in developing tissues often takes the form of stripes of gene expression that mark the boundaries of a particular cell type or morphogenetic process. How stripes form is still in many cases poorly understood. Here we use optogenetics and live-cell biosensors to investigate one such pattern: the posterior stripe of brachyenteron (byn) expression in the early Drosophila embryo. This byn stripe depends on interpretation of an upstream signal – a gradient of ERK kinase activity – and the expression of two target genes tailless (tll) and huckebein (hkb) that exert antagonistic control over byn. We find that high or low doses of ERK signaling produce either transient or sustained byn expression, respectively. These ERK stimuli also regulate tll and hkb expression with distinct dynamics: tll transcription is rapidly induced under both low and high stimuli, whereas hkb transcription converts graded ERK inputs into an output switch with a variable time delay. Antagonistic regulatory paths acting on different timescales are hallmarks of an incoherent feedforward loop architecture, which is sufficient to explain transient or sustained byn dynamics and adds temporal complexity to the steady-state model of byn stripe formation. We further show that an all-or-none stimulus can be ‘blurred’ through intracellular diffusion to non-locally produce a stripe of byn gene expression. Overall, our study provides a blueprint for using optogenetic inputs to dissect developmental signal interpretation in space and time.
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spelling pubmed-100289842023-03-22 Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo Ho, Emily K. Oatman, Harrison R. McFann, Sarah E. Yang, Liu Johnson, Heath E. Shvartsman, Stanislav Y. Toettcher, Jared E. bioRxiv Article Positional information in developing tissues often takes the form of stripes of gene expression that mark the boundaries of a particular cell type or morphogenetic process. How stripes form is still in many cases poorly understood. Here we use optogenetics and live-cell biosensors to investigate one such pattern: the posterior stripe of brachyenteron (byn) expression in the early Drosophila embryo. This byn stripe depends on interpretation of an upstream signal – a gradient of ERK kinase activity – and the expression of two target genes tailless (tll) and huckebein (hkb) that exert antagonistic control over byn. We find that high or low doses of ERK signaling produce either transient or sustained byn expression, respectively. These ERK stimuli also regulate tll and hkb expression with distinct dynamics: tll transcription is rapidly induced under both low and high stimuli, whereas hkb transcription converts graded ERK inputs into an output switch with a variable time delay. Antagonistic regulatory paths acting on different timescales are hallmarks of an incoherent feedforward loop architecture, which is sufficient to explain transient or sustained byn dynamics and adds temporal complexity to the steady-state model of byn stripe formation. We further show that an all-or-none stimulus can be ‘blurred’ through intracellular diffusion to non-locally produce a stripe of byn gene expression. Overall, our study provides a blueprint for using optogenetic inputs to dissect developmental signal interpretation in space and time. Cold Spring Harbor Laboratory 2023-03-10 /pmc/articles/PMC10028984/ /pubmed/36945584 http://dx.doi.org/10.1101/2023.03.09.531972 Text en https://creativecommons.org/licenses/by/4.0/This work is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/) , which allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use.
spellingShingle Article
Ho, Emily K.
Oatman, Harrison R.
McFann, Sarah E.
Yang, Liu
Johnson, Heath E.
Shvartsman, Stanislav Y.
Toettcher, Jared E.
Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title_full Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title_fullStr Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title_full_unstemmed Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title_short Dynamics of an incoherent feedforward loop drive ERK-dependent pattern formation in the early Drosophila embryo
title_sort dynamics of an incoherent feedforward loop drive erk-dependent pattern formation in the early drosophila embryo
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10028984/
https://www.ncbi.nlm.nih.gov/pubmed/36945584
http://dx.doi.org/10.1101/2023.03.09.531972
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