Cited by 264Hypothalamic control of reproductive hormonesOlfactory and Sensory Function StudiesGrowth Hormone and Insulin-like Growth Factors

Loss-of-function mutation in the prokineticin 2 gene causes Kallmann syndrome and normosmic idiopathic hypogonadotropic hypogonadism

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Pitteloud, Nelly, Zhang, Chengkang, Pignatelli, Duarte, Li, Jia-Da, Raivio, Taneli, Cole, Lindsay W., Plummer, Lacey, Jacobson-Dickman, Elka E. +3 more·2007·Proceedings of the National Academy of Sciences

Abstract

Gonadotropin-releasing hormone (GnRH) deficiency in the human presents either as normosmic idiopathic hypogonadotropic hypogonadism (nIHH) or with anosmia [Kallmann syndrome (KS)]. To date, several loci have been identified to cause these disorders, but only 30% of cases exhibit mutations in known genes. Recently, murine studies have demonstrated a critical role of the prokineticin pathway in olfactory bulb morphogenesis and GnRH secretion. Therefore, we hypothesize that mutations in prokineticin 2 ( PROK2 ) underlie some cases of KS in humans and that animals deficient in Prok2 would be hypogonadotropic. One hundred IHH probands (50 nIHH and 50 KS) with no known mutations were examined for mutations in the PROK2 gene. Mutant PROK2s were examined in functional studies, and the reproductive phenotype of the Prok2 −/− mice was also investigated. Two brothers with KS and their sister with nIHH harbored a homozygous deletion in the PROK2 gene (p.[I55fsX1]+[I55fsX1]). Another asymptomatic brother was heterozygous for the deletion, whereas both parents (deceased) had normal reproductive histories. The identified deletion results in a truncated PROK2 protein of 27 amino acids (rather than 81 in its mature form) that lacks bioactivity. In addition, Prok2 −/− mice with olfactory bulb defects exhibited disrupted GnRH neuron migration, resulting in a dramatic decrease in GnRH neuron population in the hypothalamus as well as hypogonadotropic hypogonadism. Homozygous loss-of-function PROK2 mutations cause both KS and nIHH.

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Crossref · 10.1073/pnas.0707173104

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  • Human mutations in PROK2 and PROKR2 have been found in the heterozygous, homozygous, or compound heterozygous state.

    “Human mutations in PROK2 and PROKR2 have been found in the heterozygous, homozygous, or compound heterozygous state.”
  • Prok2−/− mice fail to enter puberty, have low gonadotropin levels, and have a significant decrease in hypothalamic GnRH neurons.

    “Likewise, Prok2−/− mice fail to enter puberty, have low gonadotropin levels, and have a significant decrease in hypothalamic GnRH neurons.”
  • GnRH neurons in Prok2−/− mice cross the cribriform plate to enter the central nervous system during embryonic development but do not migrate into and populate the hypothalamus.

    “Interestingly, GnRH neurons in Prok2−/− mice were able to cross the cribriform plate (a horizontal plate of the ethmoid bone) to enter the central nervous system during embryonic development, but the neurons did not migrate into and populate the hypothalamus.”
  • Frameshift mutations that inactivate PK2 have been reported in sporadic Kallmann syndrome and in families with Kallmann syndrome or normosmic IHH.

    “Frameshift mutations that inactivate PK2 have been reported in sporadic cases of Kallmann syndrome28 and in families with a history of Kallmann syndrome or normosmic IHH.”

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Research works printed but not linked: 1

  1. [1]Kallmann FJ, Schoenfeld WA. Am J Mental Defic. 1944;158:203–236. [Google Scholar]

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Authors
Pitteloud, N., Zhang, C., Pignatelli, D., Li, J.-D., Raivio, T., Cole, L. W., Plummer, L., Jacobson-Dickman, E. E., Mellon, P. L., Zhou, Q.-Y., & Crowley, W. F.
Affiliations
  • Harvard University (US)
  • University of California, Irvine (US)
  • Universidade do Porto (PT)
  • University of California San Diego (US)
Venue
Proceedings of the National Academy of Sciences
Published
2007-10-30
Volume
104
Issue
44
Pages
17447-17452
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2090831400
Cited by
264
References
27
Citations by year
2026: 4 · 2025: 7 · 2024: 10 · 2023: 7 · 2022: 6 · 2021: 11 · 2020: 6 · 2019: 16 · 2018: 9 · 2017: 12 · 2016: 10 · 2015: 23 · 2014: 20 · 2013: 12 · 2012: 15
FWCI
26.89
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (HD012303)
  • National Institute of Mental Health (MH067753, R01MH067753)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK044838, DK044838)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37HD020377, R01HD072754, R01HD015788, P50HD012303, U54HD029164, R01HD020377, U54HD012303, HD 020377, U54HD028138)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Sensory Systems › Olfactory and Sensory Function Studies
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
Keywords
prokineticin 2, Kallmann syndrome, GnRH deficiency, loss-of-function mutations, homozygous deletion, truncated protein, GnRH neuron migration, anosmia
MeSH terms
Animals, Base Sequence, Cell Movement, Female, Gastrointestinal Hormones, Gene Expression Regulation, Genotype, Humans, Hypogonadism, Gonadotropin-Releasing Hormone, Male, Mutation, Neurons, Neuropeptides, Pedigree, Phenotype, Reproduction, Gene Deletion, Kallmann Syndrome, Mice, Knockout, Mice

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