Sequences Essential for Activity of the Thyroid Hormone Responsive Transcription Stimulatory Element of the Rat Growth Hormone Gene

Thyroid hormone dependent transcription stimulatory and inhibitory elements exist at the 5′-end of the rat GH (rGH) gene (TSE and TIE, respectively). In this study, the location of the sequences essential for TSE activity was examined using stably transfected GC cells. Because the TIE may influence TSE activity, we investigated TSE activity both on the rGH promoter, in the presence of the TIE, and on the viral thymidine kinase promoter, with the TIE deleted. The results of these studies indicate that the minimum sequences essential for TSE activity exist between positions −194 and −169 of the rGH gene.