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Elucidating Transcription Factor Regulation By Tcdd Within The Hs1,2 Enhancer, Sharon D. Ochs
Elucidating Transcription Factor Regulation By Tcdd Within The Hs1,2 Enhancer, Sharon D. Ochs
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Immunoglobulin heavy chain (IgH) expression and Ig secretion is inhibited by the environmental contaminant 2,3,7,8-tetrachlorodibenzo-ρ-dioxin (TCDD). Within the IgH gene, the 3' IgH regulatory region (3'IgH RR) has been identified as a transcriptional target of TCDD. The 3'IgH RR, which in part regulates transcription of the IgH gene, is composed of four enhancers in the mouse: hs3a; hs1,2; h3b; hs4 and three enhancers in the human: hs3a; hs1,2; hs4. In humans the hs1,2 enhancer has an invariant sequence (IS) containing a DRE, NF-κB, NF1 and AP-1 binding site. Also, the enhancer has an AP1.ETS and Oct …