Functional analysis of cis-acting DNA sequences controlling transcription of the human type I collagen genes.

The 3500-base pair region located immediately upstream of the transcriptional start site of the human pro-alpha 2(I) collagen gene contains all the sequences necessary for cell-specific transcription. In transient expression assays, the pro-alpha 2(I) collagen promoter directed the production of high levels of bacterial chloramphenicol acetyltransferase in collagen-producing human fetal fibroblasts. Enzyme activity, on the other hand, was nearly undetectable in extracts from collagen-nonproducing immortalized lymphoblasts. Deletion experiments narrowed the active segment of the human promoter to a phylogenetically conserved sequence comprised between nucleotides-376 and -108, relative to the initiation site of transcription. In similar analyses, the pro-alpha 1(I) collagen gene failed to direct cell-specific transcription. As part of this study, the controversial issue surrounding the putative enhancer element in the first intron of the human pro-alpha 1(I) collagen gene also has been reconsidered. Accordingly, we now propose a more restricted definition of this cis-acting DNA element since its action is exerted in an orientation-preferred manner and with a strong specificity for its own promoter. Moreover, stimulation does not appear to be tissue-specific. Finally, evidence is presented supporting the notion that although structurally different and distinctly arranged, the regulatory sequences of the type I collagen genes may bind similar trans-acting factors.

• Publication year

  1990

• Venue

  Journal of Biological Chemistry

• Publication date

  1990-08-05

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/S0021-9258(19)38305-XPMID 2376598
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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