Induction of α1-tubulin gene expression during development and regeneration of the fish central nervous system

The α1- and α2-tubulin encoding genes were cloned from a goldfish genomic DNA library. α1- and α2-tubulin RNA expression was examined in developing and adult retinas. These studies demonstrated increased α1-tubulin RNA in presumptive ganglion cells that grow axons early in retinal development and in adult retinal ganglion cells whose optic axons had been damaged. The α2-tubulin RNA was undetectable in developing retina and constitutively expressed in adult retinal ganglion cells regardless of optic nerve crush. To determine if these changes in α1-tubulin RNA reflected changes in α1-tubulin promoter activity, we introduced into zebrafish embryos and adult goldfish retinal explants expression vectors harboring the α1-tubulin gene's promoter. These studies showed that the α1-tubulin promoter confers a developmentally regulated, neuron-restricted pattern of reporter gene expression in vivo and its activity is increased in adult retinal neurons induced to regenerate their axons. Promoter deletions defined regions of α1-tubulin DNA necessary for this pattern of expression. These results suggest that DNA sequences necessary for α1-tubulin gene induction during central nervous system development and regeneration are contained within the α1-tubulin gene's 5′-flanking DNA and that this promoter will be useful for identifying these elements and their DNA binding proteins. © 1998 John Wiley & Sons, Inc. J Neurobiol 37: 429–440, 1998Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/34478/1/8_ftp.pd

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Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

ALTERATIONS HISTOLOGIQUES DE QUELQUES GLANDES ENDOCRINES CHEZ LA RATE, APRES L'ADMINISTRATION D'UN CARCINOGENE CHIMIQUE

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Biologie et génétique

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Histologie animale (vertèbres)

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Histologie animale

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