Two Novel Cases of Resistance to Thyroid Hormone Due to THRA Mutation.
Thyroid
; 30(8): 1217-1221, 2020 08.
Article
en En
| MEDLINE
| ID: mdl-32204686
Resistance to thyroid hormone alpha (RTHα) is a rare and under-recognized genetic disease caused by mutations of THRA, the gene encoding thyroid hormone receptor α1 (TRα1). We report here two novel THRA missense mutations (M259T, T273A) in patients with RTHα. We combined biochemical and cellular assays with in silico modeling to assess the capacity of mutant TRα1 to bind triiodothyronine (T3), to heterodimerize with RXR, to interact with transcriptional coregulators, and to transduce a T3 transcriptional response. M259T, and to a lower extent T273A, reduces the affinity of TRα1 for T3. Their negative influence is only reverted by large excess of T3. The severity of the two novel RTHα cases originates from a reduction in the binding affinity of TRα1 mutants to T3 and thus correlates with the incapacity of corepressors to dissociate from TRα1 mutants in the presence of T3.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Síndrome de Resistencia a Hormonas Tiroideas
/
Mutación Missense
/
Receptores alfa de Hormona Tiroidea
Tipo de estudio:
Prognostic_studies
Límite:
Child, preschool
/
Female
/
Humans
/
Infant
/
Newborn
Idioma:
En
Revista:
Thyroid
Asunto de la revista:
ENDOCRINOLOGIA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Estados Unidos