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KLB, encoding β-Klotho, is mutated in patients with congenital hypogonadotropic hypogonadism

Lookup NU author(s): Dr Tarja Kinnunen, Dr Richard Quinton

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2017 EMBO. Congenital hypogonadotropic hypogonadism (CHH) is a rare genetic form of isolated gonadotropin-releasing hormone (GnRH) deficiency caused by mutations in > 30 genes. Fibroblast growth factor receptor 1 (FGFR1) is the most frequently mutated gene in CHH and is implicated in GnRH neuron development and maintenance. We note that a CHH FGFR1 mutation (p.L342S) decreases signaling of the metabolic regulator FGF21 by impairing the association of FGFR1 with β-Klotho (KLB), the obligate co-receptor for FGF21. We thus hypothesized that the metabolic FGF21/KLB/FGFR1 pathway is involved in CHH. Genetic screening of 334 CHH patients identified seven heterozygous loss-of-function KLB mutations in 13 patients (4%). Most patients with KLB mutations (9/13) exhibited metabolic defects. In mice, lack of Klb led to delayed puberty, altered estrous cyclicity, and subfertility due to a hypothalamic defect associated with inability of GnRH neurons to release GnRH in response to FGF21. Peripheral FGF21 administration could indeed reach GnRH neurons through circumventricular organs in the hypothalamus. We conclude that FGF21/KLB/FGFR1 signaling plays an essential role in GnRH biology, potentially linking metabolism with reproduction.


Publication metadata

Author(s): Xu C, Messina A, Somm E, Miraoui H, Kinnunen T, Acierno J, Niederlander NJ, Bouilly J, Dwyer AA, Sidis Y, Cassatella D, Sykiotis GP, Quinton R, De Geyter C, Dirlewanger M, Schwitzgebel V, Cole TR, Toogood AA, Kirk JM, Plummer L, Albrecht U, Crowley WF, Mohammadi M, Tena-Sempere M, Prevot V, Pitteloud N

Publication type: Article

Publication status: Published

Journal: EMBO Molecular Medicine

Year: 2017

Online publication date: 28/07/2017

Acceptance date: 27/06/2017

Date deposited: 09/08/2017

ISSN (electronic): 1757-4684

Publisher: Blackwell Publishing Ltd

URL: https://doi.org/10.15252/emmm.201607376

DOI: 10.15252/emmm.201607376


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