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Updated: Apr 16, 2026

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
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NELF knockout is associated with impaired pubertal development and subfertility.

Samuel D Quaynor1, Eun Kyung Ko1, Lynn P Chorich1

  • 1Section of Reproductive Endocrinology, Infertility, & Genetics, Department of Obstetrics & Gynecology; Department of Physiology; Georgia Regents University, Augusta, GA 30912, USA.

Molecular and Cellular Endocrinology
|March 4, 2015
PubMed
Summary

Nasal embryonic luteinizing hormone-releasing factor (NELF) is crucial for reproduction. NELF deficiency in mice impairs fertility and GnRH neuron number, mirroring human hypogonadotropic hypogonadism.

Keywords:
GnRH neuron migrationNELFNSMFinfertilitynasal embryonic LHRH factor

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Area of Science:

  • Reproductive biology
  • Neuroendocrinology
  • Genetics

Background:

  • Proper function of the hypothalamic-pituitary-gonadal axis is essential for puberty and reproduction.
  • Gonadotropin-releasing hormone (GnRH) neurons originate in the olfactory placode and migrate to the hypothalamus.
  • Nasal embryonic luteinizing hormone-releasing factor (NELF) mutations are linked to hypogonadotropic hypogonadism, but typically require co-occurring mutations.

Purpose of the Study:

  • To investigate the physiological role of NELF in reproduction using a homozygous Nelf knockout (KO) mouse model.
  • To understand NELF's function in GnRH neuron development and migration.
  • To correlate NELF's function in mice with human hypogonadotropic hypogonadism.

Main Methods:

  • Generation and analysis of a homozygous Nelf knockout (KO) mouse model.
  • Assessment of reproductive parameters including puberty onset, fertility, and litter size.
  • Quantification of GnRH neuron numbers in KO mice.

Main Results:

  • Female Nelf KO mice exhibited delayed vaginal opening, reduced uterine weight, and fewer GnRH neurons.
  • Male Nelf KO mice showed normal pubertal development.
  • Both male and female Nelf KO mice displayed impaired fertility with reduced mean litter size.

Conclusions:

  • NELF plays a significant role in mammalian reproduction.
  • The Nelf KO mouse model partially recapitulates the human phenotype of hypogonadotropic hypogonadism, where NELF mutations often require a second genetic hit.
  • NELF is important for GnRH neuron number and overall fertility.