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- W2015197852 abstract "Steroid 21-hydroxylase deficiency is the most common cause of congenital adrenal hyperplasia. It results from a deficiency in a specific cytochrome P450, P450c21 (P450XXIA). The gene encoding this protein (CYP21B) and a closely linked pseudogene (CYP21A) are located in the HLA complex on chromosome 6p. Many mutant alleles are associated with deletions of CYP21B; we report the cloning and characterization of a nondeleted mutant CYP21B gene. This mutant gene is expressed on transfection into mouse Y1 adrenal cells, producing mRNA levels similar to those seen after transfection of the normal CYP21B gene. In codon 172 of the mutant gene, the normal codon ATC, encoding isoleucine, has been changed to AAC, encoding asparagine. This mutation is normally present in the CYP21A pseudogene, so that it may have been transferred to the mutant CYP21B gene by gene conversion. Hybridization of oligonucleotide probes corresponding to this and two other mutations normally present in CYP21A demonstrated that 4 out of 20 patients carried the codon 172 mutation; in one of these patients, the mutation was present as part of a larger gene conversion involving at least exons 3-6. Gene conversion may be a frequent cause of 21-hydroxylase deficiency alleles due to the presence of six chi-like sequences (GCTGGGG) in the CYP21 genes and the close proximity of the CYP21A pseudogene, which has several potentially deleterious mutations." @default.
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- W2015197852 date "1988-03-01" @default.
- W2015197852 modified "2023-10-12" @default.
- W2015197852 title "Mutation in the CYP21B gene (Ile-172----Asn) causes steroid 21-hydroxylase deficiency." @default.
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- W2015197852 doi "https://doi.org/10.1073/pnas.85.5.1600" @default.
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