A mouse renin promoter containing the conserved decanucleotide element binds the same B‐cell factors as an authentic immunoglobulin heavy chain promoter

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Abstract
A mouse renin‐1 gene promoter fragment, normally inactive in B‐cells, becomes a potent promoter in these cells after insertion of the highly conserved decanucleotide (dc/cd sequence) of immunoglobulin heavy and light chain promoters [(1987) EMBO J. 6, 1685–1690]. We observe retarded complexes of the same electrophoretic mobility when the cd‐containing renin promoter fragment or an authentic immunoglobulin heavy chain promoter fragment is incubated with a nuclear extract from myeloma cells, suggesting that the renin promoter is activated due to its acquired ability to bind a B‐cell‐specific positive factor. No retarded complexes are observed with the original renin promoter fragment thus questioning the presence of a repressor as an explanation for its lack of activity in B‐cells.