Abstract
We have identified two regions of non-random purine/pyrimidine strand asymmetry that were nearly identical in sequence in the 5' flanking (promoter) regions of the human cystic fibrosis transmembrane conductance regulator (CFTR) gene and the human MUC1 gene. These regions contain perfect mirror repeat elements, a sequence motif previously found to be associated with the formation of H-DNA conformations. In this report we demonstrate that a single-stranded non-B DNA conformation exists at low pH in supercoiled plasmids containing the similar mirror repeat elements, and that S1 nuclease digestion maps the single-stranded region to the position of the mirror repeats. In addition, we identify a nuclear protein of approximately 27 kD that binds to single-stranded oligonucleotides corresponding to the purine-rich strand of this region, but not to the pyrimidine-rich strands or to double-stranded oligonucleotides with corresponding purine/pyrimidine strand asymmetry.
MeSH Terms
Base Sequence
Binding, Competitive
Cystic Fibrosis/genetics
Cystic Fibrosis Transmembrane Conductance Regulator
DNA, Single-Stranded/chemistry,metabolism
Humans
Hydrogen-Ion Concentration
Membrane Glycoproteins/genetics
Molecular Sequence Data
Mucin-1
Mucins/genetics
Nuclear Proteins/metabolism
Nucleic Acid Conformation
Oligodeoxyribonucleotides/chemistry,metabolism
Purines/metabolism
Repetitive Sequences, Nucleic Acid
Single-Strand Specific DNA and RNA Endonucleases/metabolism
Trans-Activators/metabolism
Tumor Cells, Cultured
Ultraviolet Rays
Chemicals
CFTR protein, human
DNA, Single-Stranded
Membrane Glycoproteins
Mucin-1
Mucins
Nuclear Proteins
Oligodeoxyribonucleotides
Purines
Trans-Activators
Cystic Fibrosis Transmembrane Conductance Regulator
Single-Strand Specific DNA and RNA Endonucleases
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Hollingsworth M A
Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805.
Closken C
Harris A
McDonald C D
Pahwa G S
Maher L J
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