• PMID: 17124386
• Gene Name: CYP11B1
• Condition: Precocious pseudopubarche, congenital adrenal hyperplasia, primary infertility, mild hirsutism
• Association: The significance of the missense mutation L489S in CYP11B1 is further supported by the conservation of leucine at position 489 in CYP11 genes in eleven other species.
• Mutation: L489S in CYP11B1
• Population size: 3
• Population details: 2 precocious pseudopubarche, 1 with primary infertility and mild hirsutism
• Sex: Male, Female
• Infertility type: Male infertility, Female infertility
• Other associated phenotypes: Precocious pseudopubarche, congenital adrenal hyperplasia, primary infertility, mild hirsutism

Cosegregation of a novel homozygous CYP11B1 mutation with the phenotype of non-classical congenital adrenal hyperplasia in a consanguineous family

Peters CJ, Nugent T, Perry LA, Davies K, Morel Y, Drake WM, Savage MO, Johnston LB.

We report a novel missense mutation of CYP11B1 causing non-classical 11beta-hydroxylase deficiency in 3 members of a consanguineous Turkish family. Two siblings presented with clinical evidence of precocious pseudopubarche. Biochemistry suggested 11beta-hydroxylase deficiency and genetic analysis revealed that they were homozygous for the missense mutation L489S within exon 9 of the CYP11B1 gene. The unaffected parents were heterozygotes for the same mutation. In addition, a paternal aunt of the affected siblings presenting with primary infertility and mild hirsutism was found to have the same homozygous mutation. This is the first report of a homozygous mutation in non-classical congenital adrenal hyperplasia that cosegregates with clinical phenotype. The significance of the missense mutation L489S in CYP11B1 is further supported by the conservation of leucine at position 489 in CYP11 genes in eleven other species. Molecular modelling of the enzyme suggests that the mutation L489S in CYP11B1 may alter the enzyme's substrate-binding affinity. These findings suggest that this homozygous mutation affects 11beta-hydroxylase function, resulting in the clinical features of non-classical adrenal hyperplasia in this family. FAU - Peters, C J AU - Peters CJ AD - Department of Endocrinology, Royal London Hospital, London, UK. FAU - Nugent, T AU - Nugent T FAU - Perry, L A AU - Perry LA FAU - Davies, K AU - Davies K FAU - Morel, Y AU - Morel Y FAU - Drake, W M AU - Drake WM FAU - Savage, M O AU - Savage MO