Molecular basis of thyroid dyshormonogenesis: Genetic screening in population-based Japanese patients

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

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Context: Inborn errors of thyroid hormone biosynthesis are collectively referred to as thyroid dyshormonogenesis (DH). Seven genes have been implicated in DH, including the dual oxidase 2 gene (DUOX2), the thyroglobulin gene (TG), and the thyroid peroxidase gene (TPO). Objective: We aimed to define the prevalence and phenotypic spectrum of DH with single gene mutations. Subjects and Methods: A population-based cohort of 102 patients with permanent congenital hypothyroidism was enrolled. Fourteen were diagnosed as DH and were analyzed for the seven causative genes including DUOX2, TG, and TPO. Several common mutations were screened in the remaining 88 patients. Pathogenicity of single amino acid mutations was verified in vitro. Results: We identified four, five, and two patients with seemingly biallelic mutations in DUOX2, TG, and TPO, respectively. We also found two patients having one heterozygous DUOX2 mutation and one uncommon single-nucleotide polymorphism (SNP) p.H678R (rs57659670, allele frequency 0.035) and another two patients with homozygous p.H678R. Expression experiments and RT-PCR revealed that p.H678R is a functional SNP with theoretical 40% loss of function, supporting a role of p.H678R in the onset of DH. As for clinical phenotypes, patients with inactive DUOX2 alleles (mutations and/or p.H678R) showed characteristic time-dependent improvement of thyroid function and morphology. All three evaluated patients had a negative result in the perchlorate test. Conclusions: Mutations (or a functional SNP) in DUOX2, TG, or TPO were observed in 93% (95% confidence interval = 70-99%) of DH patients. Inactive DUOX2 alleles cause a broader phenotypic spectrum than currently accepted.

Original languageEnglish
JournalJournal of Clinical Endocrinology and Metabolism
Volume96
Issue number11
DOIs
Publication statusPublished - 2011 Nov

Fingerprint

Genetic Testing
Screening
Thyroid Gland
Genes
Population
Oxidoreductases
Iodide Peroxidase
Thyroglobulin
Mutation
Polymorphism
Single Nucleotide Polymorphism
Nucleotides
Alleles
Congenital Hypothyroidism
Biosynthesis
Thyroid Hormones

ASJC Scopus subject areas

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

Cite this

Molecular basis of thyroid dyshormonogenesis : Genetic screening in population-based Japanese patients. / Narumi, Satoshi; Muroya, Koji; Asakura, Yumi; Aachi, Masanori; Hasegawa, Tomonobu.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 96, No. 11, 11.2011.

Research output: Contribution to journalArticle

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abstract = "Context: Inborn errors of thyroid hormone biosynthesis are collectively referred to as thyroid dyshormonogenesis (DH). Seven genes have been implicated in DH, including the dual oxidase 2 gene (DUOX2), the thyroglobulin gene (TG), and the thyroid peroxidase gene (TPO). Objective: We aimed to define the prevalence and phenotypic spectrum of DH with single gene mutations. Subjects and Methods: A population-based cohort of 102 patients with permanent congenital hypothyroidism was enrolled. Fourteen were diagnosed as DH and were analyzed for the seven causative genes including DUOX2, TG, and TPO. Several common mutations were screened in the remaining 88 patients. Pathogenicity of single amino acid mutations was verified in vitro. Results: We identified four, five, and two patients with seemingly biallelic mutations in DUOX2, TG, and TPO, respectively. We also found two patients having one heterozygous DUOX2 mutation and one uncommon single-nucleotide polymorphism (SNP) p.H678R (rs57659670, allele frequency 0.035) and another two patients with homozygous p.H678R. Expression experiments and RT-PCR revealed that p.H678R is a functional SNP with theoretical 40{\%} loss of function, supporting a role of p.H678R in the onset of DH. As for clinical phenotypes, patients with inactive DUOX2 alleles (mutations and/or p.H678R) showed characteristic time-dependent improvement of thyroid function and morphology. All three evaluated patients had a negative result in the perchlorate test. Conclusions: Mutations (or a functional SNP) in DUOX2, TG, or TPO were observed in 93{\%} (95{\%} confidence interval = 70-99{\%}) of DH patients. Inactive DUOX2 alleles cause a broader phenotypic spectrum than currently accepted.",
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