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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,3,10]]},"abstract":"<jats:p>\n                    During development, cells sequentially acquire specific fates through temporally ordered regulatory systems. To ensure the harmonious progression, each system must be activated and subsequently inactivated at the appropriate time. In this study, we show that the duration of fate induction is controlled by the transient expression of\n                    <jats:italic toggle=\"yes\">polished rice<\/jats:italic>\n                    (\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    ), a gene encoding micropeptides, during\n                    <jats:italic toggle=\"yes\">Drosophila<\/jats:italic>\n                    tracheal development.\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    is transiently expressed in prospective tracheal placodes and precedes the expression of\n                    <jats:italic toggle=\"yes\">trachealess<\/jats:italic>\n                    (\n                    <jats:italic toggle=\"yes\">trh<\/jats:italic>\n                    ), a master transcription factor that initiates tracheal fate.\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    induces the expression of\n                    <jats:italic toggle=\"yes\">trh<\/jats:italic>\n                    through promoting the disappearance of the repressor form of the transcriptional factor Shavenbaby (Svb). Conversely, after placode invagination, artificially prolonging\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    expression or constitutive loss of Svb leads to ectopic maintenance of\n                    <jats:italic toggle=\"yes\">trh<\/jats:italic>\n                    expression in noninvaginated placode cells surrounding the properly invaginated domain. These results indicate that the rapid disappearance of\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    properly terminates the initial fate induction system and suggest that this termination ensures a smooth transition to the subsequent fate-regulatory program\u2014that is, the maintenance of tracheal cell fate specifically in the invaginated cells. Together, we propose that the transiency of\n                    <jats:italic toggle=\"yes\">pri<\/jats:italic>\n                    serves as a cell-intrinsic molecular timer that controls the transient phase of cell fate induction and ensures the transition between sequential fate-regulatory systems, thereby enabling the precise coordination of cell identity with morphogenesis during organogenesis.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2511138123","type":"journal-article","created":{"date-parts":[[2026,3,2]],"date-time":"2026-03-02T20:10:06Z","timestamp":1772482206000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":2,"title":["Pri micropeptide functions as a cell-intrinsic timer controlling the transient phase of cell fate 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