Regulation of transcription of the TATA-less human complement component C4 gene
Vaishnaw, A., Mitchell, T., Rose, S., Walport, M. and Morley, B. J., 1998. Regulation of transcription of the TATA-less human complement component C4 gene. The Journal of Immunology, 160, pp. 4353-4360.
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The 5'-sequences flanking the human complement component C4 genes (C4A and C4B) have been analyzed for their ability to direct expression of a reporter gene in cell lines that constitutively express or do not express C4. No difference in the level of reporter gene expression was detected in cells transfected with C4A- or C4B-specific constructs. A series of reporter constructs containing progressively truncated C4 promoter fragments transfected into the hepatocyte Hep G2 cell line, identified the sequence contained within the region -178 to -39 as that associated with maximal reporter gene expression. This region contains consensus binding motifs for nuclear factor 1 (-110 to -97), Sp1 (-57 to -49), and three basic helix-loop-helix (-137 to -132, -98 to -93, and -78 to -73)-like transcription factors. Electromobility shift assays and DNase I footprinting analysis showed specific DNA-protein interactions of the C4 promoter at the nuclear factor 1, two E box (-98 to -93 and -78 to -73), and Sp1 binding domains. Site-directed mutagenesis of the Sp1 binding site resulted in total abrogation of reporter gene expression and mutation of the E box (-78 to -73) resulted in a 8-fold reduction in expression. We conclude that the Sp1 binding site at position -57 to -49 is critical for accurately initiated, basal transcription of C4.
|Creators||Vaishnaw, A., Mitchell, T., Rose, S., Walport, M. and Morley, B. J.|
|Departments||University Administration & Central Services > Vice-Chancellor's Office|
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