Regulation of the Transglutaminase I gene

Medvedev, A., Saunders, N. A., Matsuura, H., Chistokhina, A. and Jettens, A. (1999) Regulation of the Transglutaminase I gene. The Journal of Biological Chemistry, 274 6: 3887-3896. doi:10.1074/jbc.274.6.3887

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Author Medvedev, A.
Saunders, N. A.
Matsuura, H.
Chistokhina, A.
Jettens, A.
Title Regulation of the Transglutaminase I gene
Journal name The Journal of Biological Chemistry   Check publisher's open access policy
ISSN 0021-9258
Publication date 1999-02-05
Sub-type Article (original research)
DOI 10.1074/jbc.274.6.3887
Open Access Status File (Publisher version)
Volume 274
Issue 6
Start page 3887
End page 3896
Total pages 10
Place of publication Bethesda, USA
Publisher American Society for Biochemistry & Molecular Biology
Collection year 1999
Language eng
Subject C1
321015 Oncology and Carcinogenesis
730108 Cancer and related disorders
Abstract The transglutaminase I (TGase I) gene encodes an enzyme that catalyzes the cross-linking of structural proteins involved in the formation of the cornified envelope during squamous cell differentiation. To identify DNA elements important for the transcriptional control of the TGase I gene, we analyzed the ability of a 2.9-kilobase pair (kb) upstream regulatory region to control the expression of a reporter gene in vivo and in vitro. Transgenic mice bearing the pTG(-2.9kb)CAT construct exhibited the same pattern of tissue-specific expression of CAT as reported for TGase I. Deletion analysis in transiently transfected rabbit tracheal epithelial cells indicated that two sequences from bp -490 to -470 and from -54 to -37 are involved in the activation of TGase I transcription. Point mutation analysis and mobility shift assays showed that the sequence located between -54 and -37 is a functional Sp1-like transcription element. Sp1 and Sp3, but not Sp2, are part of nuclear protein complexes from differentiated RbTE cells binding to this site. The element TGATGTCA between bp -490 and -470 is contained in a larger 22-bp palindrome and resembles the consensus cAMP response element-binding protein (CREB)/AP-1 element recognized by dimeric complexes of members of the CREB, ATF, Fos, and Jun families. Mutations in this sequence greatly reduced promoter activity. Supershift analysis identified CREB1, JunB, c-Fos, Fra-1, and c-Jun in protein complexes isolated from differentiated rabbit tracheal epithelial cells binding to this site. Our study shows that the Sp1- and CREB/AP-1-like sites act in concert to stimulate transcription of the TGase I gene. The 2.9-kb promoter region could guide expression of specific genes in the granular layer of the epidermis and could be useful in gene therapy.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: UQ Diamantina Institute Publications
 
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Created: Tue, 10 Jun 2008, 15:23:58 EST