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. 1983 May;3(5):854–862. doi: 10.1128/mcb.3.5.854

Identification of two human beta-tubulin isotypes.

J L Hall, L Dudley, P R Dobner, S A Lewis, N J Cowan
PMCID: PMC368608  PMID: 6865944

Abstract

The sequence of a human beta-tubulin cDNA clone (D beta-1) is described; our data revealed 95.6% homology compared with the sequence of a human beta-tubulin processed pseudogene derived by reverse transcription of a processed mRNA (Wilde et al., Nature [London] 297:83-84, 1982). However, the amino acid sequence encoded by this cDNA showed less homology with pig and chicken beta-tubulin sequences than the latter did to each other, with major divergence within the 15 carboxy-terminal amino acids. On the other hand, an independently isolated, functionally expressed genomic human beta-tubulin sequence (5 beta) possessed a very high degree of homology with chicken and pig beta-tubulins in this region. Thus, human cells appear to contain two distinct beta-tubulin isotypes. Both the intact beta-tubulin cDNA clone and a subclone containing only the 3' untranslated region detected two mRNA species in HeLa cells; these mRNAs were 1.8 and 2.6 kilobases long and were present in about equal amounts. Two independently subcloned probes constructed from the 3' untranslated region of the 5 beta genomic sequence also detected a 2.6-kilobase beta-tubulin mRNA. However, the 3'-untranslated-region probes from the cDNA clone and the genomic sequence did not cross-hybridize. Thus, at least two human beta-tubulin genes, each specifying a distinct isotype, are expressed in HeLa cells, and the 2.6-kilobase mRNA band is a composite of at least two comigrating beta-tubulin mRNAs.

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Selected References

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