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- W2000265945 abstract "We report a Belgian girl born in 1983 with isolated thyrotropin (TSH) deficiency. Hypothyroidism without goiter was diagnosed at the age of 2 months, with extremely low total thyroxine (T4) at 0.3 microg/dL (4 nmol/L; N[normal]: 5.6-11.4 microg/dL). Basal TSH, only moderately elevated at 14.8 mU/L (N: 0-5.3; competitive radioimmunoassay, RIA), increased to 18.2 mU/L after thyrotropin-releasing hormone (TRH) stimulation, whereas prolactin increased normally. At age 15 years, after withdrawal of levothyroxine (LT4) therapy for 6 weeks, TRH stimulation slightly increased serum TSH using two immunometric assays, from less than 0.03 to 0.07 and from 0.2 to 0.3 (a monoclonal and polyclonal antibody), and from 1.9 to 4.1 mU/L using a polyclonal TSH antibody and iodinated recombinant TSH. Sequencing of the TSH-beta subunit gene revealed a homozygous single nucleotide deletion in codon 105 producing a frame shift that results in a truncated TSH-beta with nonhomologous 9 carboxyterminal amino acids and a loss of the 5 terminal residues. This mutation was previously reported in one Brazilian and two German families. The abnormal, and presumably biologically inactive, TSH can be detected in serum using appropriate antibodies. Its relatively small amount in serum is due to either reduced secretion or rapid degradation. The occurrence of the same mutation in three families of different ethnic origin suggests that this mutation may be prevalent in the population. Common ancestry or de novo mutations in a hot spot cannot be excluded. Finally, we must be aware that neonatal screening of congenital hypothyroidism based on blood spot TSH measurement will not detect this rare but severe genetic defect." @default.
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- W2000265945 date "2000-05-01" @default.
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- W2000265945 title "Congenital Central Isolated Hypothyroidism Caused by a Homozygous Mutation in the TSH-β Subunit Gene" @default.
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- W2000265945 doi "https://doi.org/10.1089/thy.2000.10.387" @default.
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