{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T14:16:43Z","timestamp":1784557003785,"version":"3.55.0"},"reference-count":20,"publisher":"Bioscientifica","license":[{"start":{"date-parts":[[2018,7,26]],"date-time":"2018-07-26T00:00:00Z","timestamp":1532563200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/3.0\/deed.en_GB"}],"content-domain":{"domain":["edm.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2018,7,26]]},"abstract":"Summary<\/jats:title>\n \n A 40-year-old man with achondroplasia presented with symptoms of hypogonadism, low libido and gynaecomastia. He was found to have hypergonadotropic hypogonadism, and karyotype and fluorescent\n in situ<\/jats:italic>\n hybridisation analysis showed\n SRY<\/jats:italic>\n -positive 46, XX disorder of sex development (DSD). He was tested to have the common activating mutation of the\n FGFR3<\/jats:italic>\n gene implicated in achondroplasia, indicating that he had the two rare conditions independently, with an extremely low incidence of 1 in 400 million. This, to the best of our knowledge, is the first report of an individual having these two rare conditions concurrently. This case highlights that individuals with achondroplasia should have normal sexual development, and in those presenting with incomplete sexual maturation or symptoms of hypogonadism should prompt further evaluation. We also propose a plausible link between achondroplasia and 46, XX DSD through the intricate interactions between the\n SRY<\/jats:italic>\n ,\n SOX9<\/jats:italic>\n and\n FGFR9<\/jats:italic>\n gene pathways.\n <\/jats:p>\n \n Learning points:<\/jats:title>\n \n \n \n The\n SOX9<\/jats:italic>\n and\n FGF9<\/jats:italic>\n genes, which are upregulated by the\n SRY<\/jats:italic>\n gene, are important in both sex determination in the embryo, as well as endochondral bone growth.\n <\/jats:p>\n <\/jats:list-item>\n \n Patients with achondroplasia should have normal sexual development and function in the absence of other confounding factors.<\/jats:p>\n <\/jats:list-item>\n \n Patients with achondroplasia who present with symptoms and signs of abnormal sexual development and\/or hypogonadism should be appropriately investigated for other causes.<\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n 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