Molecular Genetics of Steroidogenic Enzyme Deficiencies
Summary
The molecular genetics of steroidogenic enzyme deficiencies encompasses inherited disorders that disrupt the biosynthesis of steroid hormones. Steroidogenic enzymes, localised primarily in the adrenal cortex and gonads, orchestrate sequential modifications of cholesterol to produce glucocorticoids, mineralocorticoids and sex steroids. Mutations in genes such as CYP17A1, CYP21A2 and CYP11B1 impair enzyme function, leading to congenital adrenal hyperplasia (CAH) and related syndromes. Phenotypes vary from salt-wasting crises to hypertension, ambiguous genitalia and infertility, reflecting the site and severity of the enzymatic block. Advances in gene sequencing have revealed diverse mutations including missense, frameshift and splicing variants, while in vitro functional assays and structural models have elucidated the impact on enzyme activity. Improved understanding of genotype–phenotype correlations informs diagnosis, genetic counselling and targeted therapies such as tailored steroid replacement or assisted reproductive techniques. Ongoing research emphasises global diversity of pathogenic variants and seeks to refine predictive biomarkers and novel therapeutic interventions.
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Molecular Genetics of Steroidogenic Enzyme Deficiencies publication trend
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Technical terms
Congenital adrenal hyperplasia (CAH): A group of autosomal recessive disorders caused by impaired steroidogenic enzyme function, leading to cortisol and sometimes aldosterone deficiency.
CYP17A1: Gene encoding cytochrome P450c17, an enzyme with dual 17α-hydroxylase and 17,20-lyase activities essential for glucocorticoid and sex steroid synthesis.
17α-hydroxylase/17,20-lyase deficiency: A form of CAH in which mutations impair one or both catalytic functions of P450c17, resulting in cortisol deficiency and altered mineralocorticoid or androgen production.
Compound heterozygosity: The presence of two different pathogenic alleles at a locus, one on each chromosome, leading to a recessive disorder.
Urinary steroid profiling: Analytical measurement of steroid metabolites in urine to infer the activity of specific steroidogenic enzymes.
References
- Endocrine profiles and cycle characteristics of infertile 17α-hydroxylase/17,20-lyase Deficiency Patients undergoing assisted Reproduction Treatment: a retrospective cohort study. Journal of Ovarian Research (2023).
- CYP17 Mutation E305G Causes Isolated 17,20-Lyase Deficiency by Selectively Altering Substrate Binding*. Journal of Biological Chemistry (2003).
- The broad phenotypic spectrum of 17α-hydroxylase/17,20-lyase (CYP17A1) deficiency: a case series. European Journal of Endocrinology (2021).
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