Cloning and characterization of multiple human genes and cDNAs encoding highly related type II keratin 6 isoforms.

The Journal of Biological Chemistry
K TakahashiP A Coulombe

Abstract

The human type II keratin 6 (K6; 56 kDa) is expressed in a heterogeneous array of epithelial tissues under normal conditions, but is better known for its strong induction in stratified epithelia that feature an enhanced cell proliferation rate or abnormal differentiation. Previous work has established the existence of two functional genes encoding K6 protein isoforms in the human genome, although only a partial cDNA clone is available for K6a, the dominant human K6 isoform in skin epithelial tissues (Tyner, A., and Fuchs, E. (1986) J. Cell Biol. 103, 1945-1955). We screened human genomic and skin cDNA libraries with probes derived from the K6b gene, and isolated clones containing the full-length gene and cDNA predicted to encode K6a. A thorough characterization of a large number of genomic (57) as well as cDNA (64) clones further revealed the existence of as many as six different human K6 protein isoforms that are highly related at the gene structure, nucleotide sequence, and predicted amino acid sequence levels. Based on the information accumulated to date we propose an evolutionary model in which the multiplicity of human K6 genes is explained by successive gene duplication events. We further demonstrate that K6a is clearly t...Continue Reading

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