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Case Rep Endocrinol. 2018 Dec 31;2018:4081769. doi: 10.1155/2018/4081769. eCollection 2018.

The Mutant Thyroid Hormone Receptor Beta R320P Causes Syndrome of Resistance to Thyroid Hormone.

Case reports in endocrinology

Tetsuya Kimura, Yoshitaka Hayashi, Yuka Tsukamoto, Yasuyuki Okamoto

Affiliations

  1. Okamoto Thyroid Clinic, Asahi-ku, Osaka 535-0031, Japan.
  2. Research Institute of Environmental Medicine, Nagoya University, Aichi 464-8601, Japan.

PMID: 30693116 PMCID: PMC6332952 DOI: 10.1155/2018/4081769

Abstract

A 31-year-old Japanese male patient with a history of atrial fibrillation showed elevated serum levels of free thyroxine and triiodothyronine and a normal level of thyrotropin. The same abnormal hormone pattern was also found in his son. These data indicated that the index patient and the son have thyroid hormone resistance syndrome. Exon sequencing using DNA from these two patients revealed that both patients harbored a heterozygous mutation in the THRB gene: G1244C in exon 9, which results in R320P substitution. Therefore, thyroid hormone resistance syndrome caused by THRB mutation (RTH

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