Related Experiment Videos
[Thyroid hormone resistance syndrome].
Gisah A de Carvalho1, Helton E Ramos
1Serviço de Endocrinologia e Metabologia, Universidade Federal do Paraná, Curitiba, PR. carvalho@mais.sul.com.br
Arquivos Brasileiros De Endocrinologia E Metabologia
|December 22, 2004
Summary
Resistance to thyroid hormone (RTH) is a genetic disorder caused by mutations in the thyroid hormone receptor. These mutations lead to elevated thyroid hormone levels but variable clinical symptoms due to altered receptor function.
Area of Science:
- Endocrinology
- Genetics
- Molecular Biology
Context:
- Resistance to thyroid hormone (RTH) is a clinical syndrome.
- Characterized by elevated thyroid hormone (TH) levels and abnormal thyrotropin levels.
- TH resistance occurs in both the pituitary and peripheral tissues.
Purpose:
- To elucidate the molecular mechanisms underlying RTH.
- To understand the impact of mutant thyroid hormone receptors on receptor function.
- To explore the variable clinical manifestations of RTH.
Summary:
- RTH is primarily caused by mutations in the beta-thyroid hormone receptor gene, typically in the carboxyl-terminus.
- The disorder is usually inherited in an autosomal dominant pattern, with most patients being heterozygous for the mutation.
- Mutant receptors can interfere with normal receptor function (dominant-negative activity) and exhibit tissue-specific effects, leading to a variable phenotype.
Impact:
- Advances in genetic techniques and mouse models have deepened the understanding of TH receptor action in RTH.
- Identifies how specific mutations affect thyroid hormone signaling pathways.
- Provides insights into the variable clinical presentation and genetic basis of RTH.