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To function, it requires a joint between the upper and lower jaws, so jaw joint defects are often highly disruptive and difficult to study. To describe the consequences of jaw-joint dysfunction, we engineered two independent null alleles of a single jaw-joint marker gene, nkx3.2, in zebrafish. These mutations caused zebrafish to become functionally jawless via fusion of the upper and lower jaw cartilages (ankylosis). Despite lacking jaw joints, nkx3.2 mutants survived to adulthood and accommodate this defect by: a) having a remodelled skull with a fixed open gape, reduced snout, and enlarged branchial region; and b) performing ram feeding in the absence of jaw-generated suction. The late onset and broad extent of phenotypic changes in the mutants suggest that modifications to the skull are induced by functional agnathia, secondarily to nkx3.2 loss-of-function. Interestingly, nkx3.2 mutants superficially resemble ancient jawless vertebrates (anaspids and furcacaudiid thelodonts) in overall head shapes. Because no homology exists in individual skull elements between these taxa, the adult nkx3.2 phenotype is not a reversal, but convergence due to similar functional requirements of feeding without moveable jaws. This remarkable analogy strongly suggests that jaw movements themselves dramatically influence the development of jawed vertebrate skulls. Thus, these mutants provide a unique model with which to: a) investigate adaptive responses to perturbation in skeletal development; b) re-evaluate evolutionarily inspired interpretations of phenocopies generated by gene knockdowns and knockouts; and c) gain insights into feeding mechanics of the extinct agnathans.<\/jats:p>","DOI":"10.1242\/jeb.216945","type":"journal-article","created":{"date-parts":[[2020,6,11]],"date-time":"2020-06-11T12:25:42Z","timestamp":1591878342000},"source":"Crossref","is-referenced-by-count":12,"title":["nkx3.2 mutant zebrafish accommodate jaw joint loss through a phenocopy of the head shapes of Paleozoic jawless fish"],"prefix":"10.1242","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0050-4594","authenticated-orcid":false,"given":"Tetsuto","family":"Miyashita","sequence":"first","affiliation":[{"name":"Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA"},{"name":"Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pranidhi","family":"Baddam","sequence":"additional","affiliation":[{"name":"Department of Dentistry, University of Alberta, Edmonton, Alberta, Canada T6G 2R3"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna","family":"Smeeton","sequence":"additional","affiliation":[{"name":"Department of Stem Cell Biology and Regenerative Medicine, W.M. 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