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Mol. Cell. Biol., Apr 1995, 2063-2070, Vol 15, No. 4
S Li and JM Rosen
The rat whey acidic protein (WAP) gene contains a mammary gland- specific
and hormonally regulated DNase I-hypersensitive site 830 to 720 bp 5' to
the site of transcription initiation. We have reported previously that
nuclear factor I (NFI) binding at a palindromic site and binding at a
half-site are the major DNA-protein interactions detected within this
tissue-specific nuclease-hypersensitive region. We now show that point
mutations introduced into these NFI-binding sites dramatically affect WAP
gene expression in transgenic mice. Transgene expression was totally
abrogated when the palindromic NFI site or both binding sites were mutated,
suggesting that NFI is a key regulator of WAP gene expression. In addition,
a recognition site for mammary gland factor (STAT5), which mediates
prolactin induction of milk protein gene expression, was also identified
immediately proximal to the NFI-binding sites. Mutation of this site
reduced transgene expression by approximately 90% per gene copy, but did
not alter tissue specificity. These results suggest that regulation of WAP
gene expression is determined by the cooperative interactions among several
enhancers that constitute a composite response element.
Copyright © 1995, American Society for Microbiology
Nuclear factor I and mammary gland factor (STAT5) play a critical role in regulating rat whey acidic protein gene expression in transgenic mice
Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030.
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