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. 1989 Aug;8(8):2291–2296. doi: 10.1002/j.1460-2075.1989.tb08355.x

Thyroid-stimulating hormone (TSH) deficiency caused by a single base substitution in the CAGYC region of the beta-subunit.

Y Hayashizaki 1, Y Hiraoka 1, Y Endo 1, K Miyai 1, K Matsubara 1
PMCID: PMC401161  PMID: 2792087

Abstract

Congenital isolated thyroid-stimulating hormone (TSH) deficiency is an autosomal recessive disease that manifests as hypothyroidism (cretinism), causing severe mental and growth retardations. Patients were found to have a single base substitution in the codon for the 29th amino acid of the TSH beta subunit gene. The alteration is in the center of the so-called CAGYC region, which consists of an amino acid sequence conserved among all of the known glycoprotein hormone beta subunits. No other nucleotide substitutions have been found in the gene thus far sequenced. Microinjection of the mutated beta mRNAs into Xenopus laevis oocytes led to the formation of conformationally altered beta polypeptides that could not associate with alpha subunits. The mutation created a new recognition site for the enzyme MaeI. Southern blot hybridization of genomic DNA digested with MaeI showed that the patients were homozygous and their parents were heterozygous for the mutation. This test was also used to examine other family members for the disease.

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Selected References

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