Abstract:
:The amniote middle ear is a classical example of the evolutionary novelty. Although paleontological evidence supports the view that mammals and diapsids (modern reptiles and birds) independently acquired the middle ear after divergence from their common ancestor, the developmental bases of these transformations remain unknown. Here we show that lower-to-upper jaw transformation induced by inactivation of the Endothelin1-Dlx5/6 cascade involving Goosecoid results in loss of the tympanic membrane in mouse, but causes duplication of the tympanic membrane in chicken. Detailed anatomical analysis indicates that the relative positions of the primary jaw joint and first pharyngeal pouch led to the coupling of tympanic membrane formation with the lower jaw in mammals, but with the upper jaw in diapsids. We propose that differences in connection and release by various pharyngeal skeletal elements resulted in structural diversity, leading to the acquisition of the tympanic membrane in two distinct manners during amniote evolution.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kitazawa T,Takechi M,Hirasawa T,Adachi N,Narboux-Nême N,Kume H,Maeda K,Hirai T,Miyagawa-Tomita S,Kurihara Y,Hitomi J,Levi G,Kuratani S,Kurihara Hdoi
10.1038/ncomms7853subject
Has Abstractpub_date
2015-04-22 00:00:00pages
6853issn
2041-1723pii
ncomms7853journal_volume
6pub_type
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