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Decreased FGF8 signaling causes deficiency of gonadotropin-releasing hormone in humans and mice

Lookup NU author(s): Dr Richard Quinton, Professor Simon Pearce

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Abstract

Idiopathic hypogonadotropic hypogonadism (IHH) with anosmia (Kallmann syndrome; KS) or with a normal sense of smell (normosmic IHH; nIHH) are heterogeneous genetic disorders associated with deficiency of gonadotropin-releasing hormone (GnRH). While loss-of-function mutations in FGF receptor 1 (FGFR1) cause human GnRH deficiency, to date no specific ligand for FGFR1 has been identified in GnRH neuron ontogeny. Using a candidate gene approach, we identified 6 missense mutations in FGF8 in IHH probands with variable olfactory phenotypes. These patients exhibited varied degrees of GnRH deficiency, including the rare adult-onset form of hypogonadotropic hypogonadism. Four mutations affected all 4 FGF8 splice isoforms (FGF8a, FGF8b, FGF8e, and FGF8f), while 2 mutations affected FGF8e and FGF8f isoforms only. The mutant FGF8b and FGF8f ligands exhibited decreased biological activity in vitro. Furthermore, mice homozygous for a hypomorphic Fgf8 allele lacked GnRH neurons in the hypothalamus, while heterozygous mice showed substantial decreases in the number of GnRH neurons and hypothalamic GnRH peptide concentration. In conclusion, we identified FGF8 as a gene implicated in GnRH deficiency in both humans and mice and demonstrated an exquisite sensitivity of GnRH neuron development to reductions in FGF8 signaling.


Publication metadata

Author(s): Falardeau J, Chung WCJ, Beenken A, Raivio T, Plummer L, Sidis Y, Jacobson-Dickman EE, Eliseenkova AV, Ma J, Dvfyer A, Quinton R, Na S, Hall JE, Huot C, Alois N, Pearce SHS, Cole LW, Hughes V, Mohammadi M, Tsai P, Pitteloud N

Publication type: Article

Publication status: Published

Journal: Journal of Clinical Investigation

Year: 2008

Volume: 118

Issue: 8

Pages: 2822-2831

ISSN (print): 0021-9738

ISSN (electronic): 1558-8238

Publisher: American Society for Clinical Investigation

URL: http://dx.doi.org/10.1172/JCI34538

DOI: 10.1172/JCI34538


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