Mutation of a gene for thyroid transcription factor-1 (TITF1) in a patient with clinical features of resistance to thyrotropin

Keisuke Nagasaki, Satoshi Narumi, Tadashi Asami, Toru Kikuchi, Tomonobu Hasegawa, Makoto Uchiyama

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Resistance to TSH (RTSH [MIM 275200]) is a heterogeneous condition defined by variable degree of insensitivity to biologically active TSH. While this condition is classically caused by loss-of-function mutations of the TSH receptor gene (TSHR), several patients have exhibited RTSH-like phenotype in the apparent absence of TSHR mutations, and some of them have mutations of PAX8 or GNAS1. We identified a Japanese boy with congenital hypothyroidism who suffered from recurrent lower respiratory infection during infancy and choreoathetosis at a later age. At 14 years of age, he was diagnosed as having RTSH, on the basis of compensated hypothyroidism (TSH, 30.2 mU/L; FT4, 1.2 ng/dl), disproportionate increments of thyroid hormones and TSH during a TRH test (ΔFT3, 0.4 pg/ml; ΔT3, 13 ng/dl; and ΔTSH, 88.3 mU/L), and normal ultrasound thyroid image and radioactive iodine uptakes. Molecular analysis for TITF1 revealed a novel de novo heterozygous deletion/insertion mutation (c.470_479delinsGCG,) that is predicted to lose the entire homeodomain and the NK2-specific domain. We suggest that a heterozygous loss-of-function TITF1 mutation can also cause RTSH-compatible phenotype.

Original languageEnglish
Pages (from-to)875-878
Number of pages4
JournalEndocrine journal
Volume55
Issue number5
DOIs
Publication statusPublished - 2008

Keywords

  • Congenital hypothyroidism
  • Resistance to TSH
  • TITF1

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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