Cited by 21Sexual Differentiation and DisordersAdrenal Hormones and DisordersMetabolism and Genetic Disorders

Phenotypic, metabolic, and molecular genetic characterization of six patients with congenital adrenal hyperplasia caused by novel mutations in the CYP11B1 gene

Nguyen, Huy-Hoang, Eiden-Plach, Antje, Hannemann, Frank, Malunowicz, Ewa M., Hartmann, Michaela F., Wudy, Stefan A., Bernhardt, Rita·2016·The Journal of Steroid Biochemistry and Molecular Biology

Abstract

Congenital adrenal hyperplasia (CAH) is an autosomal recessive inherited disorder of steroidogenesis. Steroid 11β-hydroxylase deficiency (11β-OHD) due to mutations in the CYP11B1 gene is the second most common form of CAH. In this study, 6 patients suffering from CAH were diagnosed with 11β-OHD using urinary GC-MS steroid metabolomics analysis. The molecular basis of the disorder was investigated by molecular genetic analysis of the CYP11B1 gene, functional characterization of splicing and missense mutations, and analysis of the missense mutations in a computer model of CYP11B1. All patients presented with abnormal clinical signs of hyperandrogenism. Their urinary steroid metabolomes were characterized by excessive excretion rates of metabolites of 11-deoxycortisol as well as metabolites of 11-deoxycorticosterone, and allowed definite diagnosis. Patient 1 carries compound heterozygous mutations consisting of a novel nonsense mutation p.Q102X (c.304C>T) in exon 2 and the known missense mutation p.T318R (c.953C>G) in exon 5. Two siblings (patient 2 and 3) were compound heterozygous carriers of a known splicing mutation c.1200+1G>A in intron 7 and a known missense mutation p.R448H (c.1343G>A) in exon 8. Minigene experiments demonstrated that the c.1200+1G>A mutation caused abnormal pre-mRNA splicing (intron retention). Two further siblings (patient 4 and 5) were compound heterozygous carriers of a novel missense mutation p.R332G (c.994C>G) in exon 6 and the known missense mutation p.R448H (c.1343G>A) in exon 8. A CYP11B1 activity study in COS-1 cells showed that only 11% of the enzyme activity remained in the variant p.R332G. Patient 6 carried a so far not described homozygous deletion g.2470_5320del of 2850 bp corresponding to a loss of the CYP11B1 exons 3-8. The breakpoints of the deletion are embedded into two typical 6 base pair repeats (GCTTCT) upstream and downstream of the gene. Experiments analyzing the influence of mutations on splicing and on enzyme function were applied as complementary procedures to genotyping and provided a rational basis for understanding the clinical phenotype of CAH.

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Crossref · 10.1016/j.jsbmb.2015.10.011

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  • GC-MS is particularly useful for urinary steroid metabolome analysis, but it can also be applied to the analysis of blood or tissues or be used as a gold standard in quality assurance.

    “GC-MS is particularly useful for urinary steroid metabolome analysis, but it can also be applied to the analysis of blood or tissues (291) or be used as a gold standard in quality assurance (292).”

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Authors
Nguyen, H.-H., Eiden-Plach, A., Hannemann, F., Malunowicz, E. M., Hartmann, M. F., Wudy, S. A., & Bernhardt, R.
Affiliations
  • Vietnam Academy of Science and Technology (VN)
  • Saarland University (DE)
  • Justus-Liebig-Universität Gießen (DE)
Corresponding author
Bernhardt, Rita
Venue
The Journal of Steroid Biochemistry and Molecular Biology
Publisher
Elsevier BV
Published
2016-01
Volume
155
Issue
Pt A
Pages
126-134
ISSN
0960-0760 (ISSN-L)
OpenAlex
W2177661617
Cited by
21
References
31
Citations by year
2024: 3 · 2023: 3 · 2022: 2 · 2021: 4 · 2019: 2 · 2018: 1 · 2017: 5 · 2016: 1
FWCI
1.01
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Steroid Biochemistry and Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
Keywords
congenital adrenal hyperplasia, CYP11B1, 11beta-hydroxylase deficiency, novel mutations, compound heterozygosity, splicing mutation, intron retention, missense mutations, nonsense mutation, hyperandrogenism, minigene analysis, homozygous deletion, genotype-phenotype correlation, steroidogenesis disorders
MeSH terms
Adrenal Hyperplasia, Congenital, Animals, Chlorocebus aethiops, Exons, Female, Humans, Introns, Male, Mutation, Pedigree, Steroid 11-beta-Hydroxylase, Steroids, COS Cells, Mutation, Missense, RNA Splice Sites

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