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Development, Vol 106, Issue 2 399-405, Copyright © 1989 by Company of Biologists
JOURNAL ARTICLES |
EA Jonas, AM Snape and TD Sargent
Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, Bethesda, MD 20892.
XK81A1 is a type I epidermal keratin gene expressed in early developmental stages of Xenopus (Jonas et al. 1985). Fusion of the keratin promoter (-5900 to +26) to a human beta globin gene led to fully epidermis-specific accumulation of human globin mRNA and protein when this DNA was injected into fertilized eggs. Further localization of regulatory sequences was accomplished by injecting marked, 5'-deleted keratin gene DNA into fertilized eggs and evaluating tissue specificity of expression. All 5' flanking DNA upstream from -487 could be removed without interfering with keratin gene expression or regulation. These results suggest that the primary mode of regulation of epidermis-specific keratin gene expression is at the level of transcription, and that sequence elements in the 5' flanking region of the keratin gene, between -487 and +26, are responsible for this regulation.
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