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. 1993 Jun 15;292(Pt 3):687–695. doi: 10.1042/bj2920687

Identification of a novel sequence element in the common promoter region of human collagen type IV genes, involved in the regulation of divergent transcription.

G Fischer 1, C Schmidt 1, J Opitz 1, Z Cully 1, K Kühn 1, E Pöschl 1
PMCID: PMC1134168  PMID: 8317999

Abstract

The expression of the heterotrimeric collagen IV molecule alpha 1(IV)2 alpha 2(IV) is essential for the structural integrity and functional properties of all basement membranes. The two genes COL4A1 and COL4A2 that code for the subunits are found closely linked on chromosome 13 in a head-to-head arrangement and are transcribed in divergent directions. We have identified a novel trans-acting factor that binds in vitro to a unique homopyrimidine/homopurine stretch within the shared promoter region of the two collagen IV genes. Additional binding sites have been identified within the first introns of both genes and the consensus sequence CCCTYCCCC for efficient binding has been deduced; the factor was named therefore 'CTC-binding factor' or 'CTCBF'. Mutations in the binding site of CTC-binding factor within the promoter inhibited binding in vitro and resulted in reduced transcription from both genes. The effect of mutations on the transcription of COL4A2 is more pronounced than on the transcription of COL4A1. CTC-binding factor is a nuclear factor that binds dominantly in vitro to the collagen IV promoter and is involved in regulating the expression of both collagen IV genes.

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