International Journal of Molecular Sciences Review Prader–Willi Syndrome and Hypogonadism: A Review Article Cees Noordam 1,2,* , Charlotte Höybye 3,4 and Urs Eiholzer 1 1 Centre for Paediatric Endocrinology Zurich (PEZZ), 8006 Zurich, Switzerland;
[email protected] 2 Department of Pediatrics, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands 3 Department of Endocrinology, Karolinska University Hospital, 111 52 Stockholm, Sweden;
[email protected] 4 Department of Molecular Medicine and Surgery, Karolinska Institute, 171 76 Stockholm, Sweden * Correspondence:
[email protected] Abstract: Prader-Labhart-Willi syndrome (PWS) is a rare genetic disorder characterized by intel- lectual disability, behavioural problems, hypothalamic dysfunction and specific dysmorphisms. Hypothalamic dysfunction causes dysregulation of energy balance and endocrine deficiencies, in- cluding hypogonadism. Although hypogonadism is prevalent in males and females with PWS, knowledge about this condition is limited. In this review, we outline the current knowledge on the clinical, biochemical, genetic and histological features of hypogonadism in PWS and its treatment. This was based on current literature and the proceedings and outcomes of the International PWS annual conference held in November 2019. We also present our expert opinion regarding the diag- nosis, treatment, care and counselling of children and adults with PWS-associated hypogonadism. Finally, we highlight additional areas of interest related to this topic and make recommendations for future studies. Keywords: Prader-Willi syndrome; hypogonadism; child; adult; review; diagnosis; treatment; substi- Citation: Noordam, C.; Höybye, C.; tution Eiholzer, U. Prader–Willi Syndrome and Hypogonadism: A Review Article. Int. J. Mol. Sci. 2021, 22, 2705. https://doi.org/10.3390/ 1.