title: A new mutation in the thyroid hormone receptor gene of a Chinese family with resistance to thyroid hormone.
abstract: BACKGROUND
  Resistance to thyroid hormone (RTH) is a dominant inherited syndrome of reduced tissue responsiveness to thyroid hormone. It is usually due to mutations located at the ligand-binding domain and adjacent hinge region of the thyroid hormone receptor β (TRβ). We report the clinical and laboratory characteristics and the genetic analysis of a patient with this rare disorder and his family members.
  
  
  METHODS
  The clinical presentations and changes of thyroid function tests (TFTs) including magnetic resonance imaging (MRI) of pituitary and other laboratory tests were analysed. TFTs of his family's members were detected as well. Direct DNA sequencing of the TRβ gene was done for those with abnormal TFTs.
  
  
  RESULTS
  The RTH child had goiter, irritability, aggressiveness, and sudoresis. His TFTs showed high levels of circulating free thyroid hormones (FT(4) and FT(3)) and normal thyroid-stimulating hormone (TSH) concentrations. He felt worse when treated as hyperthyroidism (Grave disease) with thiamazole and his clinical presentations got improved obviously when treated as RTH with bromocriptine without obvious advert effect. We identified a novel missense mutation, A317D, located in exon 9 of the gene of this boy and his mother. His mother had not any clinical presentation, but having abnormal TFTs results.
  
  
  CONCLUSIONS
  This patient reported here was concordant with the criteria of RTH. The feature is dysfunction of hypothalamus-pituitary-thyroid axis. A novel mutation was found in the TRβ, A317D, of this family. This research verified the phenomena that there is a clinical heterogeneity within the same mutation of different RTH patients.
authors: National Key Discipline of Pediatrics (Capital Medical University), Ministry of Education, Department of Endocrinology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors: Qian
authors: Q
authors: Dong
authors: Chun-Xiu
authors: CX
authors: Gong
authors: Yi
authors: Y
authors: Gu
authors: Chang
authors: C
authors: Su
mesh_terms: D002648:Child; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D020125:Mutation, Missense; D037042:Thyroid Hormone Receptors beta / Q000235:genetics*; D018382:Thyroid Hormone Resistance Syndrome / Q000175:diagnosis / Q000235:genetics* / Q000628:therapy
chemical_list: D037042:Thyroid Hormone Receptors beta