Cited by 79Sexual Differentiation and DisordersAdrenal Hormones and DisordersMetabolism and Genetic Disorders

Apparent manifesting heterozygosity in P450 oxidoreductase deficiency and its effect on coexisting 21-hydroxylase deficiency

Scott, Rachel R., Gomes, Larissa G., Huang, Ningwu, Van Vliet, Guy, Miller, Walter L.·2007·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT: P450 oxidoreductase (POR) deficiency is a disorder of steroidogenesis affecting the microsomal P450 enzymes that use POR as an electron donor. The clinical presentation is variable; patients can be asymptomatic or can present with genital anomalies and the Antley-Bixler syndrome, characterized by craniosynostosis and other bony anomalies. Obligately heterozygous parents are normal. Combined POR and 21-hydroxylase deficiencies have not been reported. OBJECTIVE: The aim was to explore the manifestations of combined deficiencies of 21-hydroxylase and POR and to search for lesions in apparent manifesting POR heterozygotes. PATIENTS AND METHODS: A newborn female had craniosynostosis, severe salt wasting, minimal virilization, grossly elevated 17OH-progesterone, and minimally elevated androgens. DNA encoding 21-hydroxylase, POR, and fibroblast growth factor receptor 2 was sequenced. For POR, the first untranslated exon (exon 1U), 5' flanking DNA, and most introns were sequenced in five apparent manifesting POR heterozygotes. RESULTS: CYP21B mutations were found on both alleles, proving classical 21-hydroxylase deficiency. Fibroblast growth factor receptor 2 exons 8 and 10 were normal. A POR mutation, A287P, was found only on the maternal allele. Five previously reported patients had POR mutations found on only one allele, but their clinical characteristics were indistinguishable from patients with mutations on both alleles. Sequencing of exon 1U, 274 bp of POR 5' flanking DNA, and 12 of the 15 POR introns did not identify additional mutations affecting gene expression or splicing. CONCLUSION: Manifesting heterozygosity is a possible feature of POR deficiency and may ameliorate the findings in coexisting 21-hydroxylase deficiency.

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  • The 69-kb human POR gene is located on chromosome 7q11.2 and consists of 16 exons.

    “The 69-kb human POR gene, located on chromosome 7q11.2,consists of 16 exons (303).”

    From The Molecular Biology, Biochemistry, and Physiology of Human Steroidogenesis and Its Disorders (2011) · cites this paper as [303]

    The ‘Characterization of exon 1U’ section describes an additional human POR exon beyond the 15 previously described, supporting a total of 16. The ‘Sequence variants in the patients’ section gives lengths for three introns, but our copy does not state a 69-kb gene length or a location at chromosome 7q11.2; searches for those details found no supporting passage. Page numbers were unavailable in the indexed copy. (LLM, conf=0.84)

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Authors
Scott, R. R., Gomes, L. G., Huang, N., Van Vliet, G., & Miller, W. L.
Affiliations
  • University of California, San Francisco (US)
  • Endocrinology Service and Research Center (R.R.S., G.V.V.), Sainte-Justine Hospital, and Department of Pediatrics, University of Montreal, Montreal, Canada H3T 1C5
Corresponding author
Miller, Walter L.
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2007-06-01
Volume
92
Issue
6
Pages
2318-2322
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W1964538959
Cited by
79
References
38
Citations by year
2026: 2 · 2025: 3 · 2023: 4 · 2022: 1 · 2021: 1 · 2020: 4 · 2019: 7 · 2017: 3 · 2016: 4 · 2015: 6 · 2014: 3 · 2013: 3 · 2012: 3
FWCI
3.71
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM073020, R01GM073020)
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
P450 oxidoreductase deficiency, 21-hydroxylase deficiency, Antley-Bixler syndrome, craniosynostosis, salt wasting, 17-hydroxyprogesterone, FGFR2, congenital adrenal hyperplasia, neonates
MeSH terms
Adrenal Hyperplasia, Congenital, Base Sequence, Craniosynostoses, Exons, Female, Heterozygote, Humans, Infant, Newborn, Introns, Molecular Sequence Data, NADPH-Ferrihemoprotein Reductase, Steroid 21-Hydroxylase, Genetic Variation

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