Cited by 198Hypothalamic control of reproductive hormonesGenetic and Clinical Aspects of Sex Determination and Chromosomal AbnormalitiesPituitary Gland Disorders and Treatments

Mutations in fibroblast growth factor receptor 1 cause Kallmann syndrome with a wide spectrum of reproductive phenotypes

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Pitteloud, Nelly, Meysing, Astrid, Quinton, Richard, Acierno, James S., Dwyer, Andrew A., Plummer, Lacey, Fliers, Eric, Boepple, Paul +7 more·2006·Molecular and Cellular Endocrinology

Abstract

Background Kallmann's syndrome (KS) is a clinically and genetically heterogeneous disorder consisting of idiopathic hypogonadotropic hypogonadism (IHH) and anosmia. Mutations in KAL1 causing the X-linked form of KS have been identified in 10% of all KS patients and consistently result in a severe reproductive phenotype. KAL1 gene encodes for anosmin-1, a key protein involved in olfactory and GnRH neuronal migration through a putative interaction with FGFR1. Heterozygous mutations in the FGFR1 gene accompanied by a high frequency of cleft palate and other facial dysmorphisms were recently identified in 8% of a large KS cohort, yet the reproductive phenotype of KS patients harboring FGFR1 mutations has not been described.Results One hundred and fifty probands with KS (130 males and 20 females) were studied to determine the frequency and distribution of FGFR1 mutations and their detailed reproductive phenotypes. Fifteen heterozygous mutations in unrelated probands were identified. Twelve missense mutations (p.R78C, p.V102I, p.D224H, p.G237D, p.R254Q, p.V273M, p.E274G, p.Y339C, p.S346C, p.I538V, p.G703S and p.G703R) were distributed among the first, second and third immunoglobulin-like domains (D1-D3), as well as the tyrosine kinase domain (TKD). The mutations Y339C and S346C are located in exon 8B and code for the isoform FGFR1c. Additionally, two nonsense mutations (p.T585X and p.R622X) were documented in the TKD of the protein. A wide spectrum of reproductive function was observed among KS probands including: (1) a severe phenotype demonstrated by microphallus, cryptorchidism, no pubertal development, undetectable serum gonadotropins and low serum testosterone (T) and inhibin B; (2) partial pubertal development; (3) the fertile eunuch variant of IHH with normal testicular size and active spermatogenesis with a reversal of HH after T therapy. In addition, we found an even wider spectrum of reproductive function within pedigrees carrying an FGFR1 mutation ranging from IHH to delayed puberty to normal reproductive function (anosmia only or asymptomatic carriers). These observations strongly suggest a role for other genes that modify the phenotype of FGFR1 mutations.Conclusion KS patients and family members carrying an FGFR1 mutation present a broad spectrum of pubertal development in contrast to the almost uniform severe clinical phenotype described in KS subjects with a KAL1 mutation. Additionally, this report implicates the isoform FGFR1c in the pathogenesis of KS.

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Crossref · 10.1016/j.mce.2006.04.021

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  • The dimorphic distribution with incomplete penetrance suggests that changes may occur in more than one gene and/or that sex-associated modifying factors may contribute to the phenotype.

    “This pattern suggests that changes may occur in more than one gene and/or that sex-associated modifying factors may contribute to the phenotype.”
  • In some cases, the severity of hypogonadism and the presence of associated phenotypes in a pedigree present in a dimorphic distribution with incomplete penetrance.

    “In some cases, the severity of hypogonadism and the presence of associated phenotypes in a pedigree present in a dimorphic distribution with incomplete penetrance.”
  • The Asp224His substitution in the second immunoglobulin-like domain is believed to prevent ligand-induced or heparin-sulfate-induced FGFR-1 dimerization and signaling.

    “An Asp224His substitution, also in the second immunoglobulin-like domain, is believed to prevent ligand-induced or heparin-sulfate-induced FGFR-1 dimerization and signaling.”
  • Amino acid substitutions in the third immunoglobulin-like domain of FGFR-1, such as Val273Met, Glu274Gly, Tyr339Cys, and Ser346Cys, are predicted to disrupt the Cys277-Cys341 disulfide bond.

    “Amino acid substitutions that map to the third immunoglobulin-like domain of FGFR-1, such as Val273Met, Glu274Gly, Tyr339Cys, and Ser346Cys, are predicted to disrupt a characteristic Cys277–Cys341 disulfide bond in this domain.”
  • Mutations in the tyrosine kinase domain of FGFR-1 are predicted to decrease or inhibit kinase activity by disrupting receptor conformation and/or altering the normal pattern of phosphorylation.

    “Mutations in the tyrosine kinase domain of FGFR-1 are predicted to decrease or inhibit kinase activity by disrupting receptor conformation (Ile538Val, Asn724Lys, and Gly703Arg) and/or altering the normal pattern of phosphorylation of the kinase domain (Ala520Thr, Gly703Ser, Pro722Ser, Pro745Ser, and Pro772Ser).”

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Authors
Pitteloud, N., Meysing, A., Quinton, R., Acierno, J. S., Dwyer, A. A., Plummer, L., Fliers, E., Boepple, P., Hayes, F., Seminara, S., Hughes, V. A., Ma, J., Bouloux, P., Mohammadi, M., & Crowley, W. F.
Affiliations
  • Massachusetts General Hospital (US)
  • Royal Free London NHS Foundation Trust (GB)
  • Amsterdam UMC Location University of Amsterdam (NL)
  • New York University (US)
Corresponding author
Pitteloud, Nelly
Venue
Molecular and Cellular Endocrinology
Publisher
Elsevier BV
Published
2006-07
Volume
254-255
Pages
60-69
ISSN
0303-7207 (ISSN-L)
OpenAlex
W2121966708
Cited by
198
References
35
Citations by year
2026: 2 · 2025: 2 · 2024: 6 · 2023: 3 · 2022: 7 · 2021: 15 · 2020: 14 · 2019: 15 · 2018: 10 · 2017: 5 · 2016: 8 · 2015: 9 · 2014: 9 · 2013: 9 · 2012: 9
FWCI
15.48
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • National Institutes of Health (5r01dk003892-40)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-03892)
  • National Institute of Dental and Craniofacial Research (R01DE013686, 2R01 DE13686-06)
  • National Center for Research Resources (M01RR001066, M01-RR01066)
  • NIH Clinical Center
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD15788, R01HD015788, U54HD029164, U54HD028138)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Pituitary Gland Disorders and Treatments
Keywords
Kallmann syndrome, FGFR1, FGFR1 mutation, idiopathic hypogonadotropic hypogonadism, reproductive phenotypes, anosmia, anosmin-1, immunoglobulin-like domains, tyrosine kinase domain, micropenis, cryptorchidism, delayed puberty, testosterone replacement therapy
MeSH terms
Adolescent, Olfaction Disorders, Child, Cleft Palate, DNA Mutational Analysis, Female, Gene Frequency, Humans, Hypogonadism, Male, Models, Molecular, Mutation, Pedigree, Phenotype, Puberty, Delayed, Reproduction, Genetic Variation, Cohort Studies, Kallmann Syndrome, Receptor, Fibroblast Growth Factor, Type 1

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