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.

CONCLUSION:

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: Wei-Chiao Chang, Cheng-Yu Liao, Wei-Chiao Chen, Yung-Ching Fan, Siou-Jin Chiu, Ho-Chang Kuo, Peng-Yeong Woon, Mei-Chyn Chao
• Journal: Clinica chimica acta; international journal of clinical chemistry (Clin Chim Acta) Vol. 413 Issue 11-12 Pg. 1004-7 (Jun 14 2012) ISSN: 1873-3492 [Electronic] Netherlands
• PMID: 22405933 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2012 Elsevier B.V. All rights reserved.

Chemical References

• Receptors, Thyrotropin
• Thyrotropin

Topics

• Adolescent
• Adult
• Asian People (genetics)
• Child
• Child, Preschool
• Congenital Hypothyroidism (etiology, genetics)
• Female
• Gene Frequency
• Heterozygote
• Homozygote
• Humans
• Infant
• Infant, Newborn
• Male
• Mutation
• Receptors, Thyrotropin (genetics)
• Reference Values
• Taiwan
• Thyrotropin (blood)
• Young Adult