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. 1997 Jul 16;16(14):4412–4420. doi: 10.1093/emboj/16.14.4412

The T3R alpha gene encoding a thyroid hormone receptor is essential for post-natal development and thyroid hormone production.

A Fraichard 1, O Chassande 1, M Plateroti 1, J P Roux 1, J Trouillas 1, C Dehay 1, C Legrand 1, K Gauthier 1, M Kedinger 1, L Malaval 1, B Rousset 1, J Samarut 1
PMCID: PMC1170067  PMID: 9250685

Abstract

The diverse functions of thyroid hormones are thought to be mediated by two nuclear receptors, T3R alpha1 and T3R beta, encoded by the genes T3R alpha and T3R beta respectively. The T3R alpha gene also produces a non-ligand-binding protein T3R alpha2. The in vivo functions of these receptors are still unclear. We describe here the homozygous inactivation of the T3R alpha gene which abrogates the production of both T3R alpha1 and T3R alpha2 isoforms and that leads to death in mice within 5 weeks after birth. After 2 weeks of life, the homozygous mice become progressively hypothyroidic and exhibit a growth arrest. Small intestine and bones showed a strongly delayed maturation. In contrast to the negative regulatory function of the T3R beta gene on thyroid hormone production, our data show that the T3R alpha gene products are involved in up-regulation of thyroid hormone production at weaning time. Thus, thyroid hormone production might be balanced through a positive T3R alpha and a negative T3R beta pathway. The abnormal phenotypes observed on the homozygous mutant mice strongly suggest that the T3R alpha gene is essential for the transformation of a mother-dependent pup to an 'adult' mouse. These data define crucial in vivo functions for thyroid hormones through a T3R alpha pathway during post-natal development.

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Selected References

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