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- W2078663553 abstract "<i>Background/Aim:</i> 11-β-hydroxylase deficiency (11βOHD) is caused by <i>CYP11B1</i> gene defects and leads to congenital adrenal hyperplasia associated with hypertension. Recently, a novel L299P mutation has been described in a compound heterozygous male individual. We observed two 46,XX siblings with a homozygous L299P mutation and investigated the functional properties of this <i>CYP11B1</i> variant. <i>Patients:</i> The index patient from a consanguineous Turkish family showed complete external virilization and was diagnosed incidentally at the age of 19 months during hospital admission for severe combined bacterial (urosepsis) and viral (CMV and EBV) infection. The younger sibling was diagnosed at the age of 5 months. Their genital phenotype was identical and both demonstrated borderline elevated blood pressure. <i>Results:</i> Biochemical findings revealed 11βOHD. A homozygous L299P mutation of the <i>CYP11B1</i> gene was detected. In vitro expression studies performed in HCT116 cells showed a markedly decreased CYP11B1 activity in the L299P mutant (1.6 ± 0.8%) for the conversion of 11-deoxycortisol to cortisol. <i>Conclusions:</i> Our study provides clear data on the functional properties and clinical phenotype in 46,XX individuals homozygous for this point mutation. Adrenal insufficiency might have contributed to the severe infectious disease that was present in the index patient at diagnosis." @default.
- W2078663553 created "2016-06-24" @default.
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- W2078663553 date "2008-01-01" @default.
- W2078663553 modified "2023-10-18" @default.
- W2078663553 title "A Homozygous L299P Mutation in the <i>CYP11B1</i> Gene Leads to Complete Virilization in 46,XX Individuals with 11-Beta-Hydroxylase Deficiency" @default.
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- W2078663553 doi "https://doi.org/10.1159/000137659" @default.
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