title: Eya1 is required for the morphogenesis of mammalian thymus, parathyroid and thyroid.
abstract: 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(-/-) 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(-/-) 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(-/-) embryos, indicating that Six1 expression in those structures is Eya1 dependent. In addition, we show that in Eya1(-/-) 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(-/-) embryos. Our results indicate that Eya1 controls critical early inductive events involved in the morphogenesis of thymus, parathyroid and thyroid.
authors.affiliation: McLaughlin Research Institute for Biomedical Sciences, Great Falls, MT 59405, USA. pxu@po.mri.montana.edu
authors.forename: Pin-Xian
authors.initials: PX
authors.lastname: Xu
authors.forename: Weiming
authors.initials: W
authors.lastname: Zheng
authors.forename: Christine
authors.initials: C
authors.lastname: Laclef
authors.forename: Pascal
authors.initials: P
authors.lastname: Maire
authors.forename: Richard L
authors.initials: RL
authors.lastname: Maas
authors.forename: Heiko
authors.initials: H
authors.lastname: Peters
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000235:genetics; D001934:Branchial Region / Q000196:embryology / Q000473:pathology; D004268:DNA-Binding Proteins / Q000235:genetics; D004475:Ectoderm / Q000378:metabolism; D004707:Endoderm / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D008648:Mesoderm; D051379:Mice; D008815:Mice, Inbred Strains; D008817:Mice, Mutant Strains; D009024:Morphogenesis; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism; D009687:Nuclear Proteins; D051764:PAX9 Transcription Factor; D051761:Paired Box Transcription Factors; D010280:Parathyroid Glands / Q000196:embryology*; D017027:Protein Tyrosine Phosphatases; D013950:Thymus Gland / Q000196:embryology*; D013961:Thyroid Gland / Q000196:embryology*; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics
chemical_list: D004268:DNA-Binding Proteins; C101121:HOXB1 homeodomain protein; D018398:Homeodomain Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009479:Neuropeptides; D009687:Nuclear Proteins; D051764:PAX9 Transcription Factor; D051761:Paired Box Transcription Factors; C490947:Six1 protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors; C070835:PAX1 transcription factor; C501156:Eya1 protein, mouse; D017027:Protein Tyrosine Phosphatases