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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1986 Dec;83(24):9601–9605. doi: 10.1073/pnas.83.24.9601

Nucleotide sequence analysis of murine 21-hydroxylase genes: mutations affecting gene expression.

D D Chaplin, L J Galbraith, J G Seidman, P C White, K L Parker
PMCID: PMC387188  PMID: 3491986

Abstract

Steroid 21-hydroxylase [21-OHase; steroid 21-monooxygenase; steroid, hydrogen-donor:oxygen oxidoreductase (21-hydroxylating); EC 1.14.99.10] is a cytochrome P-450 enzyme required for the adrenal synthesis of mineralocorticoids and glucocorticoids. The gene encoding this protein is present in two copies (21-OHase A and B) in the S region of the murine major histocompatibility complex. Previous studies utilizing gene-specific oligonucleotide probes and gene transfer showed that only the 21-OHase A gene is expressed in the BALB/c mouse. Here, we present the complete primary structures of both BALB/c 21-OHase encoding genes. Comparison of the nucleotide sequences defines a deletion of 215 nucleotides spanning the second exon of the 21-OHase B gene; other nucleotide changes in the 21-OHase B gene introduce frame shifts and premature termination codons. Southern blot analysis of C57BL/6 and DBA/2J mice indicates that a similar deletion is present in these strains; however the C3H/HeJ strain is a structural variant. A hybrid gene composed of the 21-OHase B promoter placed 5' of the 21-OHase A structural sequences was efficiently transcribed following transfection into Y1 adrenocortical tumor cells. These findings demonstrate that the 21-OHase B gene promoter is functional and suggest that mutations within the 21-OHase B structural gene are responsible for its lack of expression.

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Selected References

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