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The mRNAs for two isotypes of alpha-tubulin, termed T alpha 1 and T26, are known to be expressed in the rat nervous system. We have compared the expression of these two alpha-tubulin mRNAs during neural development, using RNA blotting and in situ hybridization techniques with probes directed against unique sequences of each mRNA. T alpha 1 mRNA is highly enriched in the embryonic nervous system but is markedly less abundant in the adult brain; T26 mRNA is expressed in many embryonic tissues with little change in abundance during development. Within the nervous system, T alpha 1 mRNA is enriched in regions with neurons actively undergoing neurite extension, such as the cortical plate, whereas T26 mRNA is relatively homogeneous in distribution, with some enrichment in proliferative zones. Expression of T alpha 1 mRNA is also increased in PC12 cells induced to differentiate and extend neurite processes by nerve growth factor. Taken together, the data indicate that T alpha 1-tubulin mRNA is expressed at high levels during the extension of neuronal processes. The abundant expression of T alpha 1-tubulin mRNA may therefore reflect either a means to increase the available pool of alpha-tubulin or a specific requirement for the T alpha 1 isotype for neurite extension.

Isotypes of alpha-tubulin are differentially regulated during neuronal maturation.