Abstract:
:Anteroposterior (AP) patterning in the vertebrate hindbrain is dependent upon the establishment of segmental domains of Hox expression. We investigated the mechanism that governs the early expression of Hoxb4 and found that transient signaling from the paraxial mesoderm induces expression in the hindbrain. Induction involves a retinoid pathway requiring retinoic acid receptor (RAR) function within the neural plate. Characterization of a prerhombomeric enhancer from Hoxb4 reveals that a retinoic acid (RA) response element is an essential component of the early neural response to somite (s) signaling and can interpret positional information for setting the anterior boundary of expression. These data suggest a mechanism whereby, during normal hindbrain development, Hoxb4 expression is initiated by extrinsic signals and is subsequently maintained by Hox feedback circuits. This mechanism also accounts for the ectopic response of Hoxb4 in rhombomere (r) transpositions and after exposure to retinoids.
journal_name
Neuronjournal_title
Neuronauthors
Gould A,Itasaki N,Krumlauf Rdoi
10.1016/s0896-6273(00)80513-9subject
Has Abstractpub_date
1998-07-01 00:00:00pages
39-51issue
1eissn
0896-6273issn
1097-4199pii
S0896-6273(00)80513-9journal_volume
21pub_type
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