Transcription factor mutations and congenital hypothyroidism: Systematic genetic screening of a population-based cohort of Japanese patients

Satoshi Narumi, Koji Muroya, Yumi Asakura, Masanori Adachi, Tomonobu Hasegawa

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)

Abstract

Context: Gene mutations of transcription factors that are predominantly expressed in the thyroid gland cause congenital hypothyroidism (CH). The prevalence of CH due to transcription factor mutations remains undetermined. Objective: This study was designed to define the prevalence of CH due to mutations of PAX8, NKX2-1 [encoding thyroid transcription factor (TTF)-1], FOXE1 (encoding TTF-2), and NKX2-5 among patients with permanent primary CH and in the general population in Japan. Subjects and Methods: We enrolled 102 CH patients that represent 353,000 newborns born in Kanagawa prefecture from October 1979 to June 2006. We sequenced PAX8, NKX2-1, FOXE1, and NKX2-5 using PCR-based methods. Additionally, deletion/duplication of PAX8, NKX2-1, and FOXE1 was screened by multiplex ligation-dependent probe amplification. Molecular functions of putative mutations were verified in vitro. Results: We identified a novel small duplication of PAX8 (p.K80-A84dup) in two half-sibling patients with thyroid hypoplasia. We also found a novel NKX2-1 variation (p.H60W) in a sporadic nonsyndromic CH patient. In vitro experiments showed that K80-A84dup PAX8 had impaired transactivation of the thyroglobulin promoter. H60W TTF-1 exhibited a comparable transactivating capacity with wild-type TTF-1, suggesting a benign variation. We estimate the prevalence of PAX8 mutations to be 2.0% (two in 102) among Japanese CH patients and one in 176,000 (two in 353,000) in the general Japanese population. Conclusions: Using a population-based sample, we confirmed that a minor subset of CH patients has transcription factor mutations, but they are rare. In our cohort, PAX8 mutations were the leading cause of such a rare condition.

Original languageEnglish
Pages (from-to)1981-1985
Number of pages5
JournalJournal of Clinical Endocrinology and Metabolism
Volume95
Issue number4
DOIs
Publication statusPublished - 2010 Apr

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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