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Journal of Neuroscience, Vol 14, 486-498, Copyright © 1994 by Society for Neuroscience
Asymmetric expression of a novel homeobox gene in vertebrate sensory organs
DL Deitcher, DM Fekete and CL Cepko
Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115.
A novel homeobox gene, SOHo-1, was isolated from embryonic chicken retina.
On embryonic day 2 (E2), SOHo-1 is expressed in the retina, posterolateral
otic pit, and neural tube anterior to the spinal cord. On E4, SOHo-1 is
expressed at high levels in anterior retina and low levels in posterior
retina, suggestive of a role in patterning the anterior-posterior axis. It
is also expressed on E4 in the otocyst, the dorsal root ganglia, some
cranial ganglia, and the second branchial arch. SOHo-1 expression in the
otic pit and otocyst is restricted to regions that will give rise to the
nonsensory tissues of the inner ear. SOHo-1 is not closely related to any
identified vertebrate or Drosophila homeobox-containing genes. Since it is
expressed in sensory- related structures and does not fit into existing
classes of homeobox genes, we propose the name SOHo-1, for sensory organ
homeobox-1.
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