hrp0086fc15.1 | Late Breaking | ESPE2016

NR5A1 is a novel disease gene for 46,XX testicular and ovotesticular disorders of development

Baetens Dorien , Stoop Hans , Peelman Frank , Todeschini Anne-Laure , Rosseel Toon , Coppieters Frauke , Veitia Reiner , Looijenga Leendert , De Baere Elfride , Cools Martine

Background: While many causes of 46,XY disorders of sex development (DSD) have been elucidated, the mechanisms leading to 46,XX testicular or ovotesticular DSD are poorly understood. It has been hypothesized that both conditions may represent a phenotypic spectrum and that they might be caused by (different) mutations in the same genes.Methods: Whole exome sequencing was used to identify the molecular cause in ten unrelated patients with 46,XX (ovo)testi...

hrp0097p1-169 | Sex Differentiation, Gonads and Gynaecology, and Sex Endocrinology | ESPE2023

RXFP2: validating its role in autosomal recessive bilateral cryptorchidism and a novel association with male infertility

Syryn Hannes , Verdin Hannah , Van de Velde Julie , Peelman Frank , Becker Marianne , Brachet Cécile , den Brinker Marieke , Depoorter Sylvia , Fudvoye Julie , Klink Daniel , Lysy Philippe , Massa Guy , Reynaert Nele , Rochtus Anne , Staels Willem , Van Loocke Marlies , Sinclair Andrew , Ayers Katie , Bathgate Ross , Cools Martine , De Baere Elfride

Background/Aims: Cryptorchidism or undescended testis is a prevalent congenital urogenital condition affecting male newborns with an incidence rate ranging from 1.0 to 4.6%. Mouse models have implicated INSL3 and its receptor RXFP2 (formerly known as GREAT or LGR8) in the development of the condition. RXFP2 acts as a G protein-coupled receptor that triggers the generation of cAMP by binding INSL3. But despite the established role in testicular descent, so far ...