Phenotype variability and different genotype of four patients with thyroid hormone resistance syndrome due to variants in the THRB gene.

Abstract:

BACKGROUND:  Resistance to thyroid hormone (RTH) is a rare dominantly inherited disorder mainly due to variants in the THRB gene leading to decreased end-organ responsiveness to thyroid hormones. CASE REPORT:Clinical and molecular characteristics of four patients with RTH are described. Four patients with various phenotypes were studied; two prepubertal boys and two adults (one male and one female). Sequencing analysis of the THRB was performed. All individuals had persistently elevated free thyroxine and/or free triiodothyronine associated with non-suppressed thyroid-stimulating hormone (TSH), and all had non-autoimmune goiters of various sizes. In both adults, antithyroid drugs were previously administered without successful suppression of the thyroid hormones. The 27-year-old female had resting tachycardia as the only symptom. The 35-year-old male had a degree of cognitive impairment and was initially diagnosed with atrial fibrillation. The eight-year-old boy was diagnosed with attention deficit disorder and had resting tachycardia. The oldest boy (age nine years) underwent thyroid function tests as a part of the investigation for obesity and learning difficulties. Direct sequencing analysis of the THRB gene showed three previously reported variants: p.His435Leu (c.1304A>T) in the 35-year-old male, p.Pro453Thr (c.1357C>A) in the oldest boy, and p.Arg438Cys (c.1312C>T) variant in the other two patients. CONCLUSIONS:Various phenotypes characterize common variants in the THRB gene, asymptomatic, thyroid hormone deprivation symptoms, or thyroid hormone excess symptoms. RTH should be suspected in both adults and children with elevated thyroid hormones and not suppressed TSH. A prompt molecular diagnosis and genetic counseling could prevent unnecessary tests and inappropriate treatments. HIPPOKRATIA 2019, 23(3): 135-139.

journal_name

Hippokratia

journal_title

Hippokratia

authors

Toumba M,Neocleous V,Fanis P,Tanteles GA,Kyriakidou-Himonas M,Picolos M

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

135-139

issue

3

eissn

1108-4189

issn

1790-8019

pii

111540327

journal_volume

23

pub_type

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