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- W2148946263 endingPage "2004" @default.
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- W2148946263 abstract "We have previously identified sequences required for thyroid hormone (T3) induction of the rat GH (rGH) promoter, which lie in a region from -188 to -164 upstream of the mRNA start site. Within this region, Domains A, -189 to -184 and B, -179 to -174, are imperfect direct repeats, and domain C, -172 to -167, is a divergent inverted copy that matches the A domain at 4/6 positions. A series of synthetic mutant versions of this sequence were inserted upstream of a truncated rGH promoter, or as a replacement for wild-type sequences in a synthetic 237 base pair rGH promoter or upstream of the heterologous thymidine kinase promoter. Mutations changing the B domain to a perfect copy of the A domain significantly increased T3 induction (21.3-fold) relative to the wild type (3.6-fold). A single point mutation making the C domain a better match to the A domain also increased T3 induction to 16.2-fold. Combining this up-mutation with any of three down-mutations in the A, B, or C domains strongly decreased response, showing that all three domains contribute to the amplified T3 response. Binding affinity of the various mutant oligonucleotides was assessed using in vitro translated receptor and affinity paralleled the functional responses for most binding site mutations. Requirements for in vitro binding were, however, less rigorous than those for functional T3 induction. Based on these results, we propose a consensus T3 receptor binding half-site, AGGT(C/A)A, at least two copies of which are required for a T3 response.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2148946263 date "1989-12-01" @default.
- W2148946263 modified "2023-10-15" @default.
- W2148946263 title "Mutations of the Rat Growth Hormone Promoter which Increase and Decrease Response to Thyroid Hormone Define a Consensus Thyroid Hormone Response Element" @default.
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- W2148946263 doi "https://doi.org/10.1210/mend-3-12-1996" @default.
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