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Preserved Male Fertility Despite Decreased Androgen Sensitivity Caused by a Mutation in the Ligand-Binding Domain of the Androgen Receptor Gene¹

University Department of Growth and Reproduction (A.G., T.K., H.L., N.E.S.), Rigshospitalet, DK 2100 Copenhagen, Denmark; University Department of Clinical Genetics (M.S.), Rigshospitalet, DK 2100 Copenhagen, Denmark; Department of Molecular Medicine (Y.L.G., H.Z., A.W.), Karolinska Hospital, SE 17176 Stockholm, Sweden; and Department of Urology, Malmö University Hospital (A.G.), SE 20502 Malmö, Sweden

Address correspondence and requests for reprints to: Aleksander Giwercman, University Department of Urology, Malmö University Hospital, SE 20502 Malmö, Sweden. E-mail: aleksander.giwercman{at}kir.mas.lu.se

Mutations in the androgen receptor gene are considered as incompatible with preservation of fertility and have been suggested as a cause of male infertility.

Two adult brothers, referred because of gynecomastia and hormonal levels in serum indicating androgen insensitivity (high sex hormone-binding globulin, and LH levels, despite extremely high testosterone concentration), turned out to be relatives to a third young man, referred independently of the two others and exhibiting identical clinical and hormonal stigmata. In all three men, we found a CA substitution at position 2470 (exon 7) in the androgen receptor gene, leading to a Gln824Lys mutation in the ligand-binding domain of the receptor. Exploring the family history revealed that their grandfathers, on their mothers’ side, were brothers; and the Gln824Lys mutation was also found in the one of them who was still alive.

Binding studies with the mutant receptor in transfected COS-7 cells, with mibolerone as ligand, exhibited equal K_d (0.7 vs. 1.0 nmol/L), IC₅₀ (0.8 vs. 1.1 nmol/L), and maximum binding (7.1 vs. 8.9 fmol/10⁶ cells), as compared with the wild-type (WT) receptor. In a chloramphenicol acetyl transferase trans-activation assay, the activity of the mutant receptor was identical to that of the WT, when the synthetic androgen R1881 was used as a ligand; but with dihydrotestosterone, in concentrations up to 10 nmol/L, the activity of Gln824Lys mutated receptor was 10–62% of the WT variant.

Thus, Gln824Lys mutation was found, both in vivo and in vitro, to cause slight impairment of receptor function but was compatible with preservation of male fertility. The patients inherited the mutation from their grandfathers through their mothers, and one of the young men possessing the mutation has fathered a daughter.

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