PMID: 11342212May 9, 2001Paper

New epidermal keratin genes from Xenopus laevis: hormonal and regional regulation of their expression during anuran skin metamorphosis

Biochimica Et Biophysica Acta
Y WatanabeK Yoshizato

Abstract

Xenopus larval keratin (XLK) was isolated by gel electrophoresis of proteins of tadpole skin. Screening of an expression cDNA library of tail tissues by specific polyclonal antibodies against XLK produced XLK cDNA (xlk). Its complete nucleotide and predicted amino acid sequences revealed that XLK was a new member of type II keratin. Screening of a cDNA library of adult Xenopus skin using an oligonucleotide probe which had been designed from well-conserved N-terminal amino acid sequences of the rod domain of type I keratin produced two cDNAs, xak-a and xak-b, which were found to be new members of type I keratin gene. Northern blot analysis showed that xlk was expressed exclusively in the larval skin whereas xak-a and xak-b were expressed exclusively in the adult skin. Their expression level was regulated in a region- and metamorphic stage- dependent manner during larval skin development. mRNA in situ hybridization experiments identified the cells that expressed xlk, and xak-a and xak-b as larva- specific epidermal cells (skein cells and basal cells), and adult suprabasal epidermal cells, respectively. These three genes were found to be late responsive to thyroid hormone. Phylogenetic relationships of these keratins with known on...Continue Reading

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