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Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
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Established Facts Resistance to thyroid hormone (RTHβ) syndrome is caused by dominant negative variants in the THRB gene. Pathogenic variants recur within 3 hot spots in the ligand-binding domain involving the amino acid
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Committee on Molecular Metabolism and Nutrition, University of Chicago, Chicago, Illinois, USA
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Department of Pediatrics, University of Chicago, Chicago, Illinois, USA
Committee on Genetics, University of Chicago, Chicago, Illinois, USA
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What Is Known about This Topic? Mutations in the thyroid hormone receptor beta gene ( THRB ) in the region encoding the T3-binding and the adjacent hinge domains of the receptor have been reported to cause resistance to thyroid hormone
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) action ( 5 , 6 ). Previously, we have shown that the MASLD activity score (MAS) is associated with reduced TH receptor beta ( THRB ) expression in the liver of obese individuals ( 7 ). Additionally, hypothyroidism is a known risk factor for MASLD
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levels of TH in mothers with resistance to thyroid hormone beta (RTHβ). This dominantly inherited disorder is characterized by reduced responsiveness to TH caused by mutations of the THRB gene. Affected individuals are mostly asymptomatic despite high
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-dependent transcription factors [ 3 , 4 ]. Nongenomic effects of TH have also been reported [ 5 ], but those nongenomic actions are beyond the scope of this review. Different TR isoforms are generated from THRA and THRB by usage of alternative splice sites and
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EA 4340, Université Versailles Saint Quentin en Yvelines, UFR Simone Veil Santé, Montigny le Bretonneux, France
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chemically intact TH [ 1 ]. The majority of these patients carry a mutation in the β isoform of the thyroid hormone receptor gene ( THRB ), which has an autosomal dominant transmission, a situation defined in the new nomenclature as resistance to thyroid
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Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
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Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
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eutopic thyroid gland ( 1 ). The concomitant occurrence of CH and resistance to thyroid hormone syndrome type β (RTHβ) are exceptional, since only five patients have been described so far, and only in four patients, a mutation in the THRB gene has been
Departments of Pediatrics, The University of Chicago, Chicago, Ill., USA
Genetics, The University of Chicago, Chicago, Ill., USA
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Fondazione Ca' Granda Policlinico, Milan, Italy
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Resistance to thyroid hormone (RTH) was first described in 1967 [ 1 ], and the first mutations in the THRB gene were identified in 1989 [ 2 , 3 ], only 3 years after the cloning of the THR genes [ 4 , 5 ]. The cardinal features of this
Amsterdam Gastroenterology, Endocrinology & Metabolism (AGEM) Research Institute, Amsterdam UMC, Amsterdam, the Netherlands
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Amsterdam Gastroenterology, Endocrinology & Metabolism (AGEM) Research Institute, Amsterdam UMC, Amsterdam, the Netherlands
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GATTTCCCAGGAAGACATAAACC 77 Thyroid hormone receptor alpha Thra CATCTTTGA ACTGGGCAA GT CTGAGGCTT TAGACTTCC TGATC 347 Thyroid hormone receptor beta1 Thrb1 CACCTGGAT CCTGACGAT GT ACAGGTGAT GCAGCGATA GT 167 Thyroid hormone receptor beta2
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Endocrine Section, Beacon Hospital, Dublin, Ireland.
School of Medicine, University College Dublin, Ireland
Endocrinology Department, St Vincent’s University Hospital, Dublin, Ireland
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). If RTHβ is suspected, we recommend measuring TFTs in first-degree relatives. Finding abnormal TFTs in first-degree relatives strengthens the likelihood of RTHβ ( Recommendation: S; Quality of evidence: ØØ ØØ). We recommend THRB sequencing