[X-linked Kallmann's syndrome: intra and interfamilial heterogeneity].

BACKGROUND AND

OBJECTIVE

Hypogonadotropic hypogonadism and anosmia characterize Kallmann's syndrome, whose X-linked form is due to mutations in the KAL1 gene. We studied a family with 6 affected members.

PATIENTS AND METHOD: We compare their clinical (chryptorchidism, micropenis, puberty, associated malformations), analytical (gonadotrophin releasing hormone test, and human chorionic gonadotropin test), genetic (cariotype), and radiological data of the described familiar cases with other reported sporadic cases.

RESULTS

The described cases carried the R191X mutation. We found phenotypic heterogeneity between the patients.

CONCLUSIONS

We report the first familiar cases of Kallmann's syndrome due to the R191X mutation. Probably other genes and/or epigenetic factors determine the phenotype.