Specific organization of the negative response elements for retinoic acid and thyroid hormone receptors in keratin gene family

N. Radoja, D. V. Diaz, T. J. Minars, I. M. Freedberg, M. Blumenberg, Marjana Tomic-Canic

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Retinoic acid and thyroid hormone are important regulators of epidermal growth, differentiation, and homeostasis. Retinoic acid is extensively used in the treatment of many epidermal disorders ranging from wrinkles to skin cancers. Retinoic acid and thyroid hormone directly control the transcription of differentiation-specific genes including keratins. Their effect is mediated through nuclear receptors RAR and T3R. We have previously identified the response element in the K14 gene, K14RARE/TRE, to which these receptors bind, and found that it consists of a cluster of five half-sites with variable spacing and orientation. To determine whether this specific structure is found in other keratin genes, we have mapped and analyzed the RARE/TRE elements in three additional epidermal keratin genes: K5, K6, and K17. We used three different approaches to identify these elements: co- transfection of promoter deletion constructs, gel-shift assays, and site- specific mutagenesis. We localized the RARE/TRE elements relatively close to the TATA box in all three promoters. All three RARE/TRE elements have a similar structural organization: they consist of clusters of 3-6 halfsites with variable spacing and orientation. This means that the clustered structure of the RARE/TREs is a common characteristic for keratin genes. RARE and TRE in the K5 promoter are adjacent to each other whereas in the K17 promoter they overlap. All three keratin REs bind specifically both RAR and T3R in gel-shift assays. Interestingly, addition of ligand to the receptor changes the binding pattern of the T3R from homodimer to monomer, reflecting the change in regulation from induction to inhibition.

Original languageEnglish
Pages (from-to)566-572
Number of pages7
JournalJournal of Investigative Dermatology
Volume109
Issue number4
StatePublished - Oct 21 1997
Externally publishedYes

Fingerprint

Thyroid Hormone Receptors
Response Elements
Keratins
Tretinoin
Genes
Thyroid Hormones
Assays
Gels
Mutagenesis
TATA Box
Skin Neoplasms
Transcription
Cytoplasmic and Nuclear Receptors
Site-Directed Mutagenesis
Transfection
Skin
Homeostasis
Monomers
Ligands
Growth

Keywords

  • Clustered half-sites
  • Epidermis
  • Negative regulation
  • Promoters

ASJC Scopus subject areas

  • Dermatology

Cite this

Specific organization of the negative response elements for retinoic acid and thyroid hormone receptors in keratin gene family. / Radoja, N.; Diaz, D. V.; Minars, T. J.; Freedberg, I. M.; Blumenberg, M.; Tomic-Canic, Marjana.

In: Journal of Investigative Dermatology, Vol. 109, No. 4, 21.10.1997, p. 566-572.

Research output: Contribution to journalArticle

Radoja, N. ; Diaz, D. V. ; Minars, T. J. ; Freedberg, I. M. ; Blumenberg, M. ; Tomic-Canic, Marjana. / Specific organization of the negative response elements for retinoic acid and thyroid hormone receptors in keratin gene family. In: Journal of Investigative Dermatology. 1997 ; Vol. 109, No. 4. pp. 566-572.
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