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One such factor is Heartless (Htl), a Fibroblast Growth Factor Receptor (FGFR) expressed in the mesoderm. Although Htl has been extensively studied, the dynamics of its action are poorly understood after the initial phases of mesoderm formation and spreading. To begin to address this challenge, we have developed an optogenetic version of the FGFR Heartless in\n                    <jats:italic>Drosophila<\/jats:italic>\n                    (Opto-htl). Opto-htl enables us to activate the FGFR pathway in selective spatial (~\u200935 \u03bcm section from one of the lateral sides of the embryo) and temporal domains (ranging from 40\u00a0min to 14\u00a0h) during embryogenesis. Importantly, the effects can be tuned by the intensity of light-activation, making this approach significantly more flexible than other genetic approaches. We performed controlled perturbations to the FGFR pathway to define the contribution of Htl signalling to the formation of the developing embryonic heart and somatic muscles. We find a direct correlation between Htl signalling dosage and number of Tinman-positive heart cells specified. Opto-htl activation favours the specification of Tinman positive cardioblasts and eliminates Eve-positive DA1 muscles. This effect is seen to increase progressively with increasing light intensity. Therefore, fine tuning of phenotypic responses to varied Htl signalling dosage can be achieved more conveniently than with other genetic approaches. Overall, Opto-htl is a powerful new tool for dissecting the role of FGFR signalling during development.\n                  <\/jats:p>","DOI":"10.1038\/s41598-021-93512-1","type":"journal-article","created":{"date-parts":[[2021,7,8]],"date-time":"2021-07-08T06:03:17Z","timestamp":1625724197000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Spatiotemporal sensitivity of mesoderm specification to FGFR signalling in the Drosophila embryo"],"prefix":"10.1038","volume":"11","author":[{"given":"V.","family":"Yadav","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N.","family":"Tolwinski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T. 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