Cited by 251Sexual Differentiation and DisordersGenetic and Clinical Aspects of Sex Determination and Chromosomal AbnormalitiesSperm and Testicular Function

Why boys will be boys: two pathways of fetal testicular androgen biosynthesis are needed for male sexual differentiation

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Flück, Christa E., Meyer-Böni, Monika, Pandey, Amit V., Kempná, Petra, Miller, Walter L., Schoenle, Eugen J., Biason-Lauber, Anna·2011·The American Journal of Human Genetics

Abstract

Human sexual determination is initiated by a cascade of genes that lead to the development of the fetal gonad. Whereas development of the female external genitalia does not require fetal ovarian hormones, male genital development requires the action of testicular testosterone and its more potent derivative dihydrotestosterone (DHT). The "classic" biosynthetic pathway from cholesterol to testosterone in the testis and the subsequent conversion of testosterone to DHT in genital skin is well established. Recently, an alternative pathway leading to DHT has been described in marsupials, but its potential importance to human development is unclear. AKR1C2 is an enzyme that participates in the alternative but not the classic pathway. Using a candidate gene approach, we identified AKR1C2 mutations with sex-limited recessive inheritance in four 46,XY individuals with disordered sexual development (DSD). Analysis of the inheritance of microsatellite markers excluded other candidate loci. Affected individuals had moderate to severe undervirilization at birth; when recreated by site-directed mutagenesis and expressed in bacteria, the mutant AKR1C2 had diminished but not absent catalytic activities. The 46,XY DSD individuals also carry a mutation causing aberrant splicing in AKR1C4, which encodes an enzyme with similar activity. This suggests a mode of inheritance where the severity of the developmental defect depends on the number of mutations in the two genes. An unrelated 46,XY DSD patient carried AKR1C2 mutations on both alleles, confirming the essential role of AKR1C2 and corroborating the hypothesis that both the classic and alternative pathways of testicular androgen biosynthesis are needed for normal human male sexual differentiation.

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Crossref · 10.1016/j.ajhg.2011.06.009

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  • Both the canonical and backdoor pathways are essential for normal fetal masculinization.

    “These data demonstrate that both the canonical and backdoor pathways are essential for normal fetal masculinization.”
  • Disruption of the backdoor pathway causes disordered sex development (DSD) and failure of normal masculinization.

    “studies by Flück and colleagues [15] have shown that disordered sex development (DSD) will arise if the pathway is disrupted. In one individual with mutations in aldo-keto reductase type 1C2 (AKR1C2) and in another family with an added mutation in aldo-keto reductase type 1C4 (AKR1C4), there was failure of normal masculinization.”
  • The currently accepted model for masculinization is that circulating DHT, formed via the backdoor pathway in the fetal testis, is important for virilization alongside circulating testosterone.

    “Currently, the accepted model for masculinization is that circulating DHT, formed via the backdoor pathway in the fetal testis [15,16], is important for virilization alongside circulating testosterone.”
  • An alternative 'backdoor' pathway to DHT formation exists that does not require testosterone as an intermediate.

    “More recently, however, it has been reported that an alternative pathway to DHT formation exists that does not require testosterone as an intermediate. This alternative, “backdoor” pathway (Fig 1) was first described in the testes of pouch young marsupials [13], and a similar pathway has since been reported in the prepubertal mouse testis [14] and the fetal human testis [15].”
  • Masculinization of the external genitalia in humans depends on formation of 5α-dihydrotestosterone (DHT) through both the canonical androgenic pathway and an alternative (backdoor) pathway.

    “Masculinization of the external genitalia in humans is dependent on formation of 5α-dihydrotestosterone (DHT) through both the canonical androgenic pathway and an alternative (backdoor) pathway.”

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Authors
Flück, C. E., Meyer-Böni, M., Pandey, A. V., Kempná, P., Miller, W. L., Schoenle, E. J., & Biason-Lauber, A.
Affiliations
  • University of Bern (CH)
  • University of California, San Francisco (US)
  • University Children's Hospital Zurich (CH)
Corresponding author
Flück, Christa E.
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
2011-08
Volume
89
Issue
2
Pages
201-218
ISSN
0002-9297 (ISSN-L)
OpenAlex
W2066296351
Cited by
248
References
74
Citations by year
2026: 4 · 2025: 9 · 2024: 11 · 2023: 14 · 2022: 22 · 2021: 26 · 2020: 21 · 2019: 17 · 2018: 16 · 2017: 19 · 2016: 18 · 2015: 16 · 2014: 25 · 2013: 13 · 2012: 12
FWCI
6.88
Type
journal article
Language
en
Update notices
erratum (2011-08-12)
Open access
Locations
  • The American Journal of Human Genetics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Bern Open Repository and Information System (University of Bern) (submittedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion)
Funders
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (130710)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
  • Health Sciences › Medicine › Reproductive Medicine › Sperm and Testicular Function
Keywords
AKR1C2, AKR1C4, dihydrotestosterone, male sexual differentiation, 46,XY disorders of sex development, enzyme activity, aberrant splicing, candidate gene identification
MeSH terms
Amino Acid Sequence, Androgens, Base Sequence, Family, Female, Fetus, Gene Expression Regulation, Humans, Hydroxysteroid Dehydrogenases, Male, Models, Molecular, Molecular Sequence Data, Mutation, Oxidoreductases, Pedigree, Sex Differentiation, Dihydrotestosterone, Testis, Alternative Splicing, Gene Expression Profiling, 3-alpha-Hydroxysteroid Dehydrogenase (B-Specific), Mutant Proteins, Biosynthetic Pathways

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