[Structural and functional diversity of homeodomain genes of the orthodenticle and empty spiracles classes in Craniata].
Despite extensively divergent morphologies, the patterning of the embryonic brain is controlled by highly conserved genetic networks. Orthodenticle and empty spiracles-related homeodomain genes, which are expressed in insects as in vertebrates in anteriormost neuromeres of the embryonic brain, provide examples of such conservations. In gnathostomes, they form small multigene families, each containing three well-characterised orthology classes. In mice, paralogous genes play very different roles in the development of cephalic regions. Some of these roles are probably ancient and conserved in all chordates, while others, like the morphogenesis of gnathostomespecific characters, correspond to much more diversified functions. Genetic analyses in mice together with comparative analyses in a broad range of vertebrates provide new possibilities to investigate the molecular mechanisms which underlie these functional diversifications.
Derobert
Y
Y
Equipe ATIPE de l'UPRES-A 8080 Développement et Evolution, Université Paris-Sud, Orsay.
Germot
A
A
Spengler
T
T
Mazan
S
S
D000818:Animals; D001921:Brain / Q000196:embryology*; D002816:Chordata, Nonvertebrate / Q000196:embryology / Q000235:genetics; D029721:Drosophila Proteins; D004331:Drosophila melanogaster / Q000235:genetics; D005314:Embryonic and Fetal Development / Q000235:genetics; D019143:Evolution, Molecular; D018507:Gene Expression Regulation, Developmental; D005801:Genes, Homeobox; D006257:Head / Q000196:embryology*; D018398:Homeodomain Proteins / Q000235:genetics* / Q000502:physiology; D051379:Mice; D009024:Morphogenesis / Q000235:genetics; D010802:Phylogeny; D013045:Species Specificity; D014714:Vertebrates / Q000196:embryology / Q000235:genetics*; D000099260:Empty Spiracles Homeobox Proteins
D029721:Drosophila Proteins; D018398:Homeodomain Proteins; C093054:ems protein, Drosophila; D000099260:Empty Spiracles Homeobox Proteins; C093053:oc protein, Drosophila