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A novel variant of THRβ and its 4-year clinical course in a Korean boy with resistance to thyroid hormone

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Author(s)
Sejin KimSoyun ParkJungeun MoonHeungsik KimSeokjin Kang
Keimyung Author(s)
Kim, Heung Sik
Department
Dept. of Pediatrics (소아청소년학)
Journal Title
Ann Pediatr Endocrinol Metab
Issued Date
2023
Volume
28
Issue
3
Keyword
THRβThyroid hormone resistanceThyroid hormone receptorLevothyroxineHeterozygous mutationThyroid-stimulating hormone
Abstract
Thyroid hormone resistance (RTH) is characterized by a decreased sensitivity of target tissues to thyroid hormones due to a defect in the THRα- and THRβ-encoded thyroid hormone receptors (THRs). The clinical manifestations range from no symptoms to simple goiter and hypo- or hyperthyroidism, depending on the receptor subtype distribution in the tissues. Here, we report the case of a thyroid hormone-resistant 12-month-old boy carrying a novel THRβ variant who was initially diagnosed with congenital hypothyroidism. An extensive evaluation revealed increased free T4 level and inappropriately increased thyroid-stimulating hormone (TSH) level; a normal lipid profile, sex hormone-binding globulin, and free alpha subunit of TSH; exaggerated TSH response to THR; and no radiological evidence of pituitary adenoma. A targeted next-generation sequencing panel identified a heterozygote c.993T>G (p.Asn331Lys) mutation in the THRβ gene. During the first year of life, a higher dose of levothyroxine was administered to the patient due to uncompensated RTH. Levothyroxine treatment was continued after 3 years to maintain TSH level <5 mIU/mL, but the observed weight gain was poor, height increase was insufficient, and bone development was delayed. However, neither hyperactivity nor developmental delay was observed. Patients with RTH exhibit various clinical features. Due to its heterogeneous nature, genetic test for accurate diagnosis is important to provide proper management.
Keimyung Author(s)(Kor)
김흥식
Publisher
School of Medicine (의과대학)
Type
Article
ISSN
2287-1292
Source
https://e-apem.org/journal/view.php?doi=10.6065/apem.2142246.123
DOI
10.6065/apem.2142246.123
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/45071
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Pediatrics (소아청소년학)
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