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Congenital hypogonadotropic hypogonadism (CHH) is characterised by absent or arrested pubertal development due to abnormal hypothalamic gonadotropin-releasing hormone (GnRH) secretion or its action. A number of candidate genes (more than 20) have been identified to underlie CHH either acting alone or in combination. The prototype example of isolated CHH is Kallmann syndrome (KS) which has four subtypes: type 1 (mutation in anosmin gene), type 2 (mutation in fibroblast growth factor receptor 1 (FGFR1)), type 3 ((mutation in prokinecitin receptor 2 (PROKR2)) and type 4 (mutation in prokinecitin). Loss-of-function mutations of FGFR1 or KS2 are responsible for about 10%–12% of patients with CHH. FGFR1 is expressed in a number of tissues, including the brain and skeletal system. Spontaneous reversal of CHH …
Contributors All authors were involved in managing the patient.
PPC and RB were involved in literature search and preparing the manuscript. SM and SC were involved providing the intellectual inputs.
Competing interests None declared.
Patient consent Guardian consent obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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