{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T10:11:54Z","timestamp":1789726314770,"version":"4.0.1"},"reference-count":69,"publisher":"The Company of Biologists","issue":"13","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2002,7,1]]},"abstract":"<jats:p>Eyes absent (Eya) genes regulate organogenesis in both vertebrates and invertebrates. Mutations in human EYA1 cause congenital Branchio-Oto-Renal (BOR) syndrome, while targeted inactivation of murine Eya1 impairs early developmental processes in multiple organs, including ear, kidney and skeletal system. We have now examined the role of Eya1 during the morphogenesis of organs derived from the pharyngeal region, including thymus, parathyroid and thyroid. The thymus and parathyroid are derived from 3rd pharyngeal pouches and their development is initiated via inductive interactions between neural crest-derived arch mesenchyme, pouch endoderm, and possibly the surface ectoderm of 3rd pharyngeal clefts. Eya1 is expressed in all three cell types during thymus and parathyroid development from E9.5 and the organ primordia for both of these structures failed to form in Eya1\u2013\/\u2013 embryos. These results indicate that Eya1 is required for the initiation of thymus and parathyroid gland formation. Eya1 is also expressed in the 4th pharyngeal region and ultimobranchial bodies. Eya1\u2013\/\u2013 mice show thyroid hypoplasia, with severe reduction in the number of parafollicular cells and the size of the thyroid lobes and lack of fusion between the ultimobranchial bodies and the thyroid lobe. These data indicate that Eya1 also regulates mature thyroid gland formation. Furthermore, we show that Six1 expression is markedly reduced in the arch mesenchyme, pouch endoderm and surface ectoderm in the pharyngeal region of Eya1\u2013\/\u2013 embryos, indicating that Six1 expression in those structures is Eya1 dependent. In addition, we show that in Eya1\u2013\/\u2013 embryos, the expression of Gcm2 in the 3rd pouch endoderm is undetectable at E10.5, however, the expression of Hox and Pax genes in the pouch endoderm is preserved at E9.5-10.5. Finally, we found that the surface ectoderm of the 3rd and 4th pharyngeal region show increased cell death at E10.5 in Eya1\u2013\/\u2013 embryos. Our results indicate that Eya1 controls critical early inductive events involved in the morphogenesis of thymus, parathyroid and thyroid.<\/jats:p>","DOI":"10.1242\/dev.129.13.3033","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T00:57:11Z","timestamp":1619398631000},"page":"3033-3044","source":"Crossref","is-referenced-by-count":235,"title":["<i>Eya1<\/i>\n                    is required for the morphogenesis of mammalian thymus, parathyroid and thyroid"],"prefix":"10.1242","volume":"129","author":[{"given":"Pin-Xian","family":"Xu","sequence":"first","affiliation":[{"name":"McLaughlin Research Institute for Biomedical Sciences, Great Falls, MT 59405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weiming","family":"Zheng","sequence":"additional","affiliation":[{"name":"McLaughlin Research Institute for Biomedical Sciences, Great Falls, MT 59405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine","family":"Laclef","sequence":"additional","affiliation":[{"name":"INSERM 129, ICGM, 75014 Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pascal","family":"Maire","sequence":"additional","affiliation":[{"name":"INSERM 129, ICGM, 75014 Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard L.","family":"Maas","sequence":"additional","affiliation":[{"name":"Division of Genetics, Department of Medicine, Brigham and Women\u2019s Hospital and Harvard Medical School, Boston, MA 02115, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heiko","family":"Peters","sequence":"additional","affiliation":[{"name":"Division of Genetics, Department of Medicine, Brigham and Women\u2019s Hospital and Harvard Medical School, Boston, MA 02115, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Xu","sequence":"additional","affiliation":[{"name":"McLaughlin Research Institute for Biomedical Sciences, Great Falls, MT 59405, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","reference":[{"key":"2021042604201945500_ABDELHAK-ETAL-1997","doi-asserted-by":"crossref","unstructured":"Abdelhak, S., Kalatzis, V., Heilig, R., Compain, S., Samson, D., Vincent, C. et al. 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