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Kuribayashi, I. et al.

Kuribayashi, Kuge, Santa, Mutlaq, Yamasaki, Furuno, Takahashi, Chida, Nakamura, Endo, Doi, Onishi, Shizuta,

A missense mutation (GGC[435Gly]-->AGC[Ser]) in exon 8 of the CYP11B2 gene inherited in Japanese patients with congenital hypoaldosteronism.

OBJECTIVES: To clarify the underlying molecular mechanism of corticosterone methyl oxidase type II (CMO II) deficiency, Japanese patients newly diagnosed with CMO II deficiency were investigated. METHODS: We analyzed the patients' genomic DNA sequence on all 9 exons of the CYP11B2 gene. In addition, restriction fragment length polymorphism (RFLP) analysis and expression studies were performed. RESULTS: The analysis showed that the patients homozygously retained a missense mutation, Gumacr;GC[435Gly]-->Aumacr;GC[Ser], in the CYP11B2 gene. Expression studies indicated that the steroid 18-hydroxylase/oxidase activities of the mutant enzyme were substantially reduced. CONCLUSION: These results support the hypothesis that this mutation causes CMO II deficiency in the patients, and are in accordance with our theory that the partial loss of P-450(C18) activities causes CMO II deficiency.[1]

References

A missense mutation (GGC[435Gly]-->AGC[Ser]) in exon 8 of the CYP11B2 gene inherited in Japanese patients with congenital hypoaldosteronism. Kuribayashi, I., Kuge, H., Santa, R.J., Mutlaq, A.Z., Yamasaki, N., Furuno, T., Takahashi, A., Chida, S., Nakamura, T., Endo, F., Doi, Y., Onishi, S., Shizuta, Y. Horm. Res. (2003) [Pubmed]

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