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. 1992 Nov 15;89(22):10633–10637. doi: 10.1073/pnas.89.22.10633

Kindred S thyroid hormone receptor is an active and constitutive silencer and a repressor for thyroid hormone and retinoic acid responses.

A Baniahmad 1, S Y Tsai 1, B W O'Malley 1, M J Tsai 1
PMCID: PMC50395  PMID: 1359543

Abstract

Mutations in the gene encoding the human thyroid hormone receptor beta (hTR beta) have been associated with generalized thyroid hormone resistance (GTHR). However, the molecular basis by which the receptor mutants cause the clinical symptoms is largely unknown. We show here that the beta form of the human receptor possesses, in addition to hormone-dependent activation, the ability to repress basal-level activity of a target promoter. This silencing function is localized in the carboxyl-terminal part of the receptor and can be transferred to a heterologous DNA binding domain. This mode of silencing is therefore distinct from inhibition by competition with activator proteins on DNA. We show that two receptor mutants isolated from patients with GTHR are impaired in transcriptional activation but fully retain the silencing function, which enforces dominant negative regulation by the receptor. Interestingly, the kindred S receptor (hTR delta 332) acts as a constitutive repressor with a strong silencing ability similar to that of the v-erbA oncogene product. We also provide evidence for distinct transcriptional regulatory properties of both proteins. Finally, we show that both thyroid hormone- and retinoic acid-responsive genes are potentially repressed to generate the clinical manifestations of the GTHR syndrome. Our findings suggest that silencing plays an important role in the phenotypic expression of the symptoms in patients with GTHR.

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Selected References

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