DLX5 regulates development of peripheral and central components of the olfactory system.
Induction, neurogenesis, and synaptogenesis of the olfactory bulb are thought to require interactions with the olfactory epithelium. The Dlx family of homeobox genes is expressed in both the olfactory bulb and olfactory epithelium. In particular, Dlx5 is expressed in the olfactory placode, olfactory epithelium, and local circuit neurons of the olfactory bulb. Here we analyzed mice lacking DLX5 function. The Dlx5-/- mutation reduces the size of the olfactory epithelium. Although some olfactory neurons are formed, they fail to generate olfactory axons that innervate the olfactory bulb. Despite the lack of innervation, the olfactory bulb forms, and neurogenesis of projection and local circuit neurons proceeds. However, the mutation has a cell-autonomous effect on the ability of neural progenitors to produce olfactory bulb local circuit neurons, with granule cells more severely affected than periglomerular cells. In addition, the mutation has a noncell-autonomous effect on the morphogenesis of mitral cells.
Long
Jason E
JE
Nina Ireland Laboratory of Developmental Neurobiology, Department of Psychiatry, Langley Porter Psychiatric Institute, University of California, San Francisco, San Francisco, California 94143-0984, USA.
Garel
Sonia
S
Depew
Michael J
MJ
Tobet
Stuart
S
Rubenstein
John L R
JL
D000818:Animals; D000943:Antigens, Differentiation / Q000235:genetics / Q000378:metabolism; D001973:Bromodeoxyuridine; D016923:Cell Death; D002455:Cell Division / Q000235:genetics; D002465:Cell Movement / Q000235:genetics; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009474:Neurons / Q000166:cytology / Q000378:metabolism; D009830:Olfactory Bulb / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D009831:Olfactory Mucosa / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D009832:Olfactory Nerve / Q000166:cytology / Q000196:embryology; D009833:Olfactory Pathways / Q000166:cytology / Q000196:embryology / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism; D005680:gamma-Aminobutyric Acid / Q000096:biosynthesis
D000943:Antigens, Differentiation; C501120:Dlx5 protein, mouse; D018398:Homeodomain Proteins; D012333:RNA, Messenger; D005680:gamma-Aminobutyric Acid; D001973:Bromodeoxyuridine