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Mol Cell Biol. 1993 Apr;13(4):2141-51.

The murine myeloperoxidase promoter contains several functional elements, one of which binds a cell type-restricted transcription factor, myeloid nuclear factor 1 (MyNF1).

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1
Division of Pediatric Oncology, Johns Hopkins Oncology Center, Johns Hopkins University, Baltimore, Maryland 21287.

Abstract

The myeloperoxidase (MPO) gene is expressed specifically in myeloid cells. There is significant homology between the murine and human MPO genes in the 1.6-kb region located upstream of the murine MPO transcription initiation sites. 5',3', and internal deletions of this DNA segment localized several cis-acting DNA elements in the murine MPO promoter which are functional in 32D cl3 cells, a murine myeloblast cell line which expresses MPO. These DNA elements did not function well in mouse L-cell fibroblasts. Additional mutagenesis of the most active promoter region allowed the delimitation of a functional 20-bp segment. Mutation of the enhancer core motif within this segment was functionally deleterious, and an oligonucleotide containing these base pairs increased the activity of a minimal promoter. This same oligonucleotide, but not a mutant variant, could bind a set of nuclear proteins, myeloid nuclear factors 1 alpha and 1 beta (MyNF1 alpha and -1 beta), present in 32D cl3 cells but absent from L cells, murine erythroleukemia cells, and SP2 lymphoid cells.

PMID:
8384306
PMCID:
PMC359535
[Indexed for MEDLINE]
Free PMC Article
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