Characterisation of three novel CYP11B1 mutations in classic and non-classic 11beta-hydroxylase deficiency.
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Polat S, Kulle A, Karaca Z, Akkurt I, Kurtoglu S, Kelestimur F, Grotzinger J, Holterhus PM, Riepe FG
Characterisation of three novel CYP11B1 mutations in classic and non-classic 11beta-hydroxylase deficiency.
Eur J Endocrinol. 2014 Apr 10;170(5):697-706. doi: 10.1530/EJE-13-0737. Print 2014 May.
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- 24536089 [ View in PubMed]
- Abstract
BACKGROUND: Congenital adrenal hyperplasia (CAH) is one of the most common autosomal recessive inherited endocrine diseases. Steroid 11beta-hydroxylase (P450c11) deficiency (11OHD) is the second most common form of CAH. AIM: The aim of the study was to study the functional consequences of three novel CYP11B1 gene mutations (p.His125Thrfs*8, p.Leu463_Leu464dup and p.Ser150Leu) detected in patients suffering from 11OHD and to correlate this data with the clinical phenotype. METHODS: Functional analyses were done by using a HEK293 cell in vitro expression system comparing WT with mutant P450c11 activity. Mutant proteins were examined in silico to study their effect on the three-dimensional structure of the protein. RESULTS: Two mutations (p.His125Thrfs*8 and p.Leu463_Leu464dup) detected in patients with classic 11OHD showed a complete loss of P450c11 activity. The mutation (p.Ser150Leu) detected in a patient with non-classic 11OHD showed partial functional impairment with 19% of WT activity. CONCLUSION: Functional mutation analysis enables the correlation of novel CYP11B1 mutations to the classic and non-classic 11OHD phenotype respectively. Mutations causing a non-classic phenotype show typically partial impairment due to reduced maximum reaction velocity comparable with non-classic mutations in 21-hydroxylase deficiency. The increasing number of mutations associated with non-classic 11OHD illustrate that this disease should be considered as diagnosis in patients with otherwise unexplained hyperandrogenism.