title: R450H TSH receptor mutation in congenital hypothyroidism in Taiwanese children.
abstract: BACKGROUND
  The most common congenital endocrine disorder, congenital hypothyroidism (CHT), is strongly associated with thyroid hormone deficiency. Previous studies have indicated that mutations of thyroid stimulation hormone receptor (TSHR) are a risk factor for the development of congenital hypothyroidism. One mutation of TSHR, p.R450H, is particularly frequent in Japanese children with CHT. However, the frequency of this TSHR mutation among Taiwanese patients with CHT is unclear.
  
  
  METHODS
  We enrolled 149 CHT patients and 334 healthy subjects who volunteered to participate in health screening examinations. We characterized the clinical status of CHT patients with the TSHR mutations.
  
  
  RESULTS
  There was a significant association between the TSHR mutation (p.R450H) and the risk of CHT (P=0.0008 under the dominant model and P=0.0002 under the allelic model). The frequency of homozygous p.R450H in the CHT patients was 1.4% and that of heterozygous p.R450H was 5.6%. All five patients had elevated serum TSH levels. However, there was no difference in TSH levels between those with heterozygous and homozygous p.R450H mutations.
  
  
  CONCLUSIONS
  Approximately 7% of the patients in this study with CHT had heterozygous or homozygous TSHR mutations (c.1349G>A, p.R450H). Consistent with previous reports on Japanese populations, this mutation was relatively important in the Taiwanese children with CHT.
authors.affiliation: Department of Medical Genetics, College of Medicine, Kaohsiung Medical University, Taiwan. wcc@kmu.edu.tw
authors.forename: Wei-Chiao
authors.initials: WC
authors.lastname: Chang
authors.forename: Cheng-Yu
authors.initials: CY
authors.lastname: Liao
authors.forename: Wei-Chiao
authors.initials: WC
authors.lastname: Chen
authors.forename: Yung-Ching
authors.initials: YC
authors.lastname: Fan
authors.forename: Siou-Jin
authors.initials: SJ
authors.lastname: Chiu
authors.forename: Ho-Chang
authors.initials: HC
authors.lastname: Kuo
authors.forename: Peng-Yeong
authors.initials: PY
authors.lastname: Woon
authors.forename: Mei-Chyn
authors.initials: MC
authors.lastname: Chao
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D003409:Congenital Hypothyroidism / Q000209:etiology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009154:Mutation; D011989:Receptors, Thyrotropin / Q000235:genetics*; D012016:Reference Values; D013624:Taiwan; D013972:Thyrotropin / Q000097:blood; D055815:Young Adult
chemical_list: D011989:Receptors, Thyrotropin; D013972:Thyrotropin