The effect of 5α-reductase-2 deficiency on human fertility.
Level 5 - mechanism / opinion, no new human data
Narrative expert review describing pathophysiology without systematic review methodology or new human data.
PubMed 24412121 · doi:10.1016/j.fertnstert.2013.11.128
What was done
This is a narrative review examining the clinical manifestations, pathophysiology, and fertility impact of 5α-reductase-2 isoenzyme deficiency, focusing on how impaired conversion of testosterone to dihydrotestosterone affects male reproductive development and function.
What was found
The abstract reports no quantitative metrics or numerical results. It summarizes the phenotypic presentation: affected males are born with ambiguous external genitalia (clitoral-like phallus, bifid scrotum, hypospadias, blind vaginal pouch, and rudimentary prostate). Virilization at puberty from testosterone prompts most individuals to adopt a male gender identity. Fertility is impaired due to cryptorchidism-associated low sperm production, defective spermatogonia-to-spermatocyte transformation, reduced semen volume from prostatic underdevelopment, and failure of semen liquefaction from prostate-specific antigen deficiency.
Why it matters
The paper synthesizes the structural and physiological barriers to fertility in 5α-reductase-2 deficiency, identifying specific testicular and prostatic factors that affect spermatogenesis and semen quality.
Limits
The abstract describes a narrative review without systematic search methods, study selection criteria, statistical meta-analysis, or new empirical data.
Cited by
- context In adolescence, the 5-alpha reduction of testosterone to DHT is necessary for sexual differentiation and full adult male maturity.