A coregulator shift, rather than the canonical switch, underlies thyroid hormone action in the liver

Yehuda Shabtai,Nagaswaroop K. Nagaraj,K. Batmanov,Young-Wook Cho,Yuxia Guan,Chunjie Jiang,Jarrett R. Remsberg,D. Forrest,M. Lazar

Published 2021 in Genes & Development

ABSTRACT

In this study, Shabtai et al. investigated the mechanism of thyroid hormone (TH)-dependent gene repression, generated a mouse line in which endogenous thyroid hormone receptor TRβ1 was epitope-tagged to allow precise chromatin immunoprecipitation at the low physiological levels of thyroid hormone receptors (TR), and defined high-confidence binding sites where TR functioned at enhancers regulated in the same direction as the nearest gene in a TRβ-dependent manner. Their results demonstrate that, in contrast to the canonical “all or none” coregulator switch model, TH regulates gene expression by orchestrating a shift in the relative binding of corepressors and coactivators.

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