FGF17 is located at chromosome 8p2.3 and FGF17 has a strong sequence identity with FGF8. FGF17 might be implicated in GnRH neuron biology as an alternative to ligand FGF8b. Miraoui et al. have identified FGF17 heterozygous mutations in three patients with congenital HH and anosmia and in another individual. This evidence concerns the gene FGF17 and Kallmann syndrome.