Cited by 379Hypothalamic control of reproductive hormonesSexual Differentiation and DisordersGenetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities

Digenic mutations account for variable phenotypes in idiopathic hypogonadotropic hypogonadism

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Pitteloud, Nelly, Quinton, Richard, Pearce, Simon, Raivio, Taneli, Acierno, James, Dwyer, Andrew, Plummer, Lacey, Hughes, Virginia +13 more·2007·Journal of Clinical Investigation

Abstract

Idiopathic hypogonadotropic hypogonadism (IHH) due to defects of gonadotropin-releasing hormone (GnRH) secretion and/or action is a developmental disorder of sexual maturation. To date, several single-gene defects have been implicated in the pathogenesis of IHH. However, significant inter- and intrafamilial variability and apparent incomplete penetrance in familial cases of IHH are difficult to reconcile with the model of a single-gene defect. We therefore hypothesized that mutations at different IHH loci interact in some families to modify their phenotypes. To address this issue, we studied 2 families, one with Kallmann syndrome (IHH and anosmia) and another with normosmic IHH, in which a single-gene defect had been identified: a heterozygous FGF receptor 1 (FGFR1) mutation in pedigree 1 and a compound heterozygous gonadotropin-releasing hormone receptor (GNRHR) mutation in pedigree 2, both of which varied markedly in expressivity within and across families. Further candidate gene screening revealed a second heterozygous deletion in the nasal embryonic LHRH factor (NELF) gene in pedigree 1 and an additional heterozygous FGFR1 mutation in pedigree 2 that accounted for the considerable phenotypic variability. Therefore, 2 different gene defects can synergize to produce a more severe phenotype in IHH families than either alone. This genetic model could account for some phenotypic heterogeneity seen in GnRH deficiency.

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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.”

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Authors
Pitteloud, N., Quinton, R., Pearce, S., Raivio, T., Acierno, J., Dwyer, A., Plummer, L., Hughes, V., Seminara, S., Cheng, Y.-Z., Li, W.-P., Maccoll, G., Eliseenkova, A. V., Olsen, S. K., Ibrahimi, O. A., Hayes, F. J., Boepple, P., Hall, J. E., Bouloux, P., Mohammadi, M., & Crowley, W.
Affiliations
  • Harvard University (US)
  • Royal Victoria Infirmary (GB)
  • Newcastle University (GB)
  • The Royal Free Hospital (GB)
  • New York University (US)
Corresponding author
Pitteloud, Nelly
Venue
Journal of Clinical Investigation
Published
2007-02-01
Volume
117
Issue
2
Pages
457-463
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2068053473
Cited by
379
References
50
Citations by year
2026: 3 · 2025: 8 · 2024: 9 · 2023: 8 · 2022: 9 · 2021: 21 · 2020: 19 · 2019: 21 · 2018: 26 · 2017: 18 · 2016: 23 · 2015: 23 · 2014: 24 · 2013: 16 · 2012: 21
FWCI
33.89
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • National Institutes of Health
  • National Institute of Dental and Craniofacial Research (DE13686, R01DE013686)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD15788, R01HD015788, HD028138, P30HD028138, P50HD028138, U54HD028138)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
Keywords
idiopathic hypogonadotropic hypogonadism, Kallmann syndrome, anosmia, phenotypic variability, incomplete penetrance, compound heterozygosity, FGF receptor 1, FGFR1, GnRH receptor, GnRH deficiency, gene-gene interaction, sexual maturation
MeSH terms
Adult, Amino Acid Sequence, Base Sequence, DNA, Female, Genotype, Heterozygote, Humans, Hypogonadism, Gonadotropin-Releasing Hormone, Male, Models, Genetic, Models, Molecular, Molecular Sequence Data, Mutation, Pedigree, Phenotype, Receptors, LHRH, Transcription Factors, Conserved Sequence, Sequence Deletion, Sequence Homology, Amino Acid, Kallmann Syndrome, Receptor, Fibroblast Growth Factor, Type 1, Fibroblast Growth Factor 8

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