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. 1988 Jul;82(1):139–144. doi: 10.1172/JCI113562

Nonsense mutation causing steroid 21-hydroxylase deficiency.

H Globerman 1, M Amor 1, K L Parker 1, M I New 1, P C White 1
PMCID: PMC303487  PMID: 3267225

Abstract

We determined the sequence of a mutant CYP21B gene isolated from a patient with the severe, "salt-wasting" form of congenital adrenal hyperplasia due to steroid 21-hydroxylase deficiency. Codon 318 in this gene is changed from CAG, encoding glutamine, to TAG, a nonsense codon. This is predicted to result in a completely nonfunctional enzyme due to premature termination of translation. In addition, when the cloned mutant gene was transfected into mouse Y1 adrenal cells, the resulting mRNA levels were decreased compared with transfected normal CYP21B genes. This mutation was carried by 3 of 20 unrelated patients with 21-hydroxylase deficiency alleles as determined by hybridization with a specific oligonucleotide probe. This mutation is also seen in the normal CYP21A pseudogene, so that its presence in the abnormal CYP21B gene may be the result of a gene conversion event.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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