A high rate of novel CYP11B1 mutations in Saudi Arabia

Ali S. Alzahrani, Meshael M. Alswailem, Avaniyapuram Kannan Murugan, Dhuha Saqer Hamad Alhmaidah, Cameron P. Capper, Richard J. Auchus, Ebtesam Qasem, Ohoud S. Alzahrani, Afaf Al-Sagheir, Bassam Bin-Abbas

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Abstract

Despite ethnic variation, 11 β-hydroxylase deficiency (11β-OHD) has generally been considered the second most common subtype of congenital adrenal hyperplasia (CAH). We report a high rate of novel mutations in this gene (CYP11B1) in patients from Saudi Arabia. We studied 16 patients with 11β-OHD from 8 unrelated families. DNA was isolated from peripheral blood. The 9 exons and exon-intron boundaries of CYP11B1 were PCR-amplified and directly sequenced. The novel mutations were functionally characterized using subcloning, in vitro mutagenesis, cell transfection and 11-deoxycortisol: cortisol conversion assays. Six mutations were found in these 8 unrelated families. Three of these mutations are completely novel and two have just been recently described as novel mutations from the same population. These include a single nucleotide insertion mutation in codon 18 (c.53_54insT) leading to frameshift and truncation in 4 siblings, a novel mutation (c.1343G>C, p.R448P) in 3 unrelated families, a novel mutation (c.1394A>T, p.H465L) in 2 siblings, a novel mutation (c.617G>T, p.G206V) in 1 patient, and a recently described non-sense novel mutation (c.780G>A, p.W260X) in another patient. Out of the 6 mutations described in this report, only one mutation (p.Q356X) was reported previously. In vitro functional testing of the 3 missense and nonsense novel mutations revealed complete loss of the 11 hydroxylase activity. We conclude that 11 β-OHD in Saudi Arabia has a unique genotype with a high rate of novel mutations. The novel p. R448P mutation is the most common mutation in this highly inbred population.

Original languageEnglish
Pages (from-to)217-224
Number of pages8
JournalJournal of Steroid Biochemistry and Molecular Biology
Volume174
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • Ambiguous genitalia
  • Congenital adrenal hyperplasia
  • CYP11B1
  • Mutations

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  • Cite this

    Alzahrani, A. S., Alswailem, M. M., Murugan, A. K., Saqer Hamad Alhmaidah, D., Capper, C. P., Auchus, R. J., Qasem, E., Alzahrani, O. S., Al-Sagheir, A., & Bin-Abbas, B. (2017). A high rate of novel CYP11B1 mutations in Saudi Arabia. Journal of Steroid Biochemistry and Molecular Biology, 174, 217-224. https://doi.org/10.1016/j.jsbmb.2017.09.018