The transcription factor delta EF1 is inversely expressed with type II collagen mRNA and can repress Col2a1 promoter activity in transfected chondrocytes

Title

The transcription factor delta EF1 is inversely expressed with type II collagen mRNA and can repress Col2a1 promoter activity in transfected chondrocytes

Creator

Murray D; Precht P; Balakir R; Horton W E

Publisher

Journal of Biological Chemistry

Date

2000
2000-02

Description

The regulation of Col2a1, which encodes type II collagen, likely results from a balance of both positive and negative proteins. Here we present evidence that the transcription factor delta EF1 participates in the negative regulation of Col2a1 transcription. A deletion analysis suggested that a region between -100 and -307 of the rat Col2a1 gene was required for activity in differentiating chick limb bud mesenchymal cells; however, mutation of a conserved E2 box site in this region actually increased promoter activity. Supershift analysis demonstrated that delta EF1, a known transcriptional repressor, bound to the E2 box in a sequence-dependent manner. Chick limb bud mesenchymal cells, which do not express type II collagen, expressed abundant delta EF1 mRNA, but, following differentiation in micromass culture, delta EF1 mRNA expression was lost. Primary embryonic chick sternal chondrocytes, which express abundant type II collagen, displayed minimal levels of delta EF1 mRNA The inhibition of Col2a1 transcription following treatment of chick sternal chondrocytes with growth factors was accompanied by increased delta EF1 expression. Overexpression of delta EF1 in differentiated chondrocytes resulted in decreased expression of a reporter construct containing a collagen II promoter/enhancer insert; however, this negative regulation was not dependent on the proximal E2 box. This is the first report of a specific transcription factor involved in the negative regulation of Col2a1.

Subject

1st intron; binding; Biochemistry & Molecular Biology; enhancer; gene-expression; helix-loop-helix; limb cartilage differentiation; messenger-rnas; nuclear factor; protein delta-ef1; tissue-specific expression; zinc-finger

Format

Journal Article

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Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

3610-3618

Issue

5

Volume

275

Citation

Murray D; Precht P; Balakir R; Horton W E, “The transcription factor delta EF1 is inversely expressed with type II collagen mRNA and can repress Col2a1 promoter activity in transfected chondrocytes,” NEOMED Bibliography Database, accessed June 13, 2021, https://neomed.omeka.net/items/show/6612.

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