Abstract
Estrogen induces the expression of three vitellogenin genes in chicken hepatocytes. To survey the vitellogenin III (VTGIII) gene region for possible distal regulatory sequences, we identified tissue-specific hypersensitive (HS) sites within a 45 kb chromatin region spanning this gene. Five constitutive HS sites were found to mark the VTGIII gene region in hormone-naive hepatocytes. Strikingly, the constitutive HS site located 5.5 kb upstream of the VTGIII gene and a previously identified HS site located within the coordinately regulated VTGII gene mapped to nearly identical copies of a 72 bp sequence. Moreover, it would appear that there has been evolutionary pressure to retain specifically this 72 bp of VTGII-like sequence near the VTGIII gene subsequent to the VTGIII and VTGII genes becoming unlinked approximately 16 Myr ago. Two additional sets of HS sites were induced in the VTGIII gene region in response to estrogen. One set mapped immediately upstream of the gene in the vicinity of what we show to be a functional estrogen response element (ERE). The other induced HS site mapped 7.5 kb upstream of the gene. This far-upstream region was sequenced and was found to contain two imperfect ERE consensus sequences spaced 88 bp apart. In transient expression assays neither of these individual imperfect ERE sequences was functional, but a fragment spanning both sequences behaved as a strong ERE. In contrast to this synergism between imperfect ERE sequences, the presence of an NF-1 binding site 23 bp away from the more distal imperfect ERE sequence was not sufficient to render the latter a functional ERE in our assays.
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