Endocrine Abstracts

Mutations in the thyroid hormone (TH) transporter MCT8 result in the Allan–Herndon–Dudley syndrome (AHDS), which is characterized by severe intellectual and motor disability and high serum T3 levels inducing thyrotoxicity in peripheral organs. At present, no effective treatment is available. Preclinical studies suggest that the T3 analogue Triac is a promising candidate to i) normalize serum T3 levels and thus alleviate the thyrotoxicosis and ii) restore TH signaling...

Background: Resistance to thyroid hormone (TH) alpha (RTHα), caused by heterozygous mutations in THRA, is characterized by abnormal thyroid function tests and features due to tissue-specific hypothyroidism, including disproportional short stature, variable motor and cognitive defects, macrocephaly and macroglossia, constipation and anemia. Mutant receptors display defective T3 binding resulting in impaired transcriptional activity. Dominant negative inhibition of the WT r...

Background: MCT8 deficiency is caused by loss-of-function (LoF) mutations in thyroid hormone (TH) transporter MCT8. Patients have developmental delay and abnormal thyroid function tests (TFTs). The large phenotypic variability is not understood. Moreover, phenotypes arising from LoF mutations could be employed to enhance understanding of physiology in the general population. Also, computational disease variant classifiers have poor predictive power to ascertain impact of MCT8 ...

Objectives: Mutations in SECISBP2 cause deficiency of selenoproteins, resulting in a multisystem disorder with abnormal circulating thyroid hormone and selenium levels and features due to lack of specific selenoproteins or loss of antioxidant selenoenzymes. Having observed early-onset, aneurysmal thoracic aortic dilatation in four patients with this disorder, we studied zebrafish and murine Secisbp2 mutant models to determine whether the aortic phenotype and selenopro...