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During embryogenesis, the OFT divides to form the aorta and pulmonary trunk, creating the double circulation present in mammals. Defects in this area account for one-third of all congenital heart defect cases. Here, we present comprehensive transcriptomic data on the developing OFT at two distinct time points (embryonic and fetal) and its adult derivatives, the aortic valves, and use spatial transcriptomics to define the distribution of cell populations. We uncover that distinctive embryonic signatures persist in adult cells and can be used as labels to retrospectively attribute relationships between cells separated by a large timescale. Single-cell regulatory network inference identifies GATA6, a transcription factor linked to common arterial trunk and bicuspid aortic valve, as a key regulator of valve precursor cells. Its downstream network reveals candidate drivers of human cardiac defects and illuminates the molecular mechanisms of both normal and pathological valve development. Our findings define the cellular and molecular signatures of the human OFT and its distinct cell lineages, which is critical for understanding congenital heart defects and developing cardiac tissue for regenerative medicine.<\/jats:p>","DOI":"10.7554\/elife.107748","type":"journal-article","created":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T14:30:44Z","timestamp":1757601044000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.107748","source":"Crossref","is-referenced-by-count":1,"title":["A cell atlas of the developing human outflow tract of the heart and its adult aortic valve derivatives"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8916-9843","authenticated-orcid":true,"given":"Rotem","family":"Leshem","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/027m9bs27","id-type":"ROR","asserted-by":"publisher"}],"name":"Faculty of Biology, Medicine and Health, University of Manchester","place":["Manchester, United 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