Transcriptional Analysis of the 5′-Noncoding Region of the Human Involucrin Gene (*)

E. López-Bayghen,Alfonso Vega,A. Cadena,Sonia E. Granados,L. F. Jave,P. Gariglio,L. M. Alvarez-Salas

Published 1996 in Journal of Biological Chemistry

ABSTRACT

Human involucrin whose gene transcription is directed by a 2456-nucleotide (nt) 5′-noncoding region is a structural component of the epithelial cornified layer. Transient transfection assays demonstrated that this region is transcriptionally active in multiplying keratinocytes and is enhanced by 2 mM CaCl treatment. Calcium-independent transcriptional activity and the interaction with the AP-1 transcriptional factor was located on the proximal part (nt −159 to −1) of the 5′-noncoding region. However, CaCl responsiveness was mapped to a distal 1185-nt fragment (nt −2456 to −1272). Moreover, this fragment potentiated the Herpes simplex thymidine kinase promoter in normal keratinocytes and is responsive to calcium treatment in a cell type-specific manner. Interestingly, the absence of a 491-nt fragment located between the two enhancer domains (nt −651 to −160) resulted in transcriptional activation in multiplying keratinocytes. This fragment interacts with AP-1 and the YY1 transcriptional silencer. It is concluded that human involucrin 5′-noncoding region contains at least three regulatory domains, a distal CaCl-responsive enhancer, a putative transcriptional silencer (that interacts with AP-1 and YY1), and a proximal enhancer/promoter (that interacts with AP-1). Thus, this study demonstrates the presence of particular transcriptional factors can potentially regulate the human involucrin expression.

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