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Published on: January 12, 2020

A NANOS3 mutation linked to protein degradation causes premature ovarian insufficiency

X Wu1, B Wang, Z Dong

  • 1MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing University, 12 Xuefu Road, Pukou District, Nanjing, China.

Cell Death & Disease
|October 5, 2013
PubMed

Insights

Mutations in the NANOS3 gene are a potential cause of primary ovarian insufficiency (POI). This study identified a NANOS3 mutation that affects protein stability and primordial germ cell numbers, linking it to POI development.

Area of Science:

  • Genetics
  • Reproductive Biology
  • Developmental Biology

Background:

  • Primary ovarian insufficiency (POI) is characterized by the loss of ovarian function before age 40.
  • A diminished ovarian follicle pool, stemming from primordial germ cells (PGCs), is a key factor in POI.
  • The Nanos gene family's role in PGC development is established in model organisms, but its human relevance is unclear.

Purpose of the Study:

  • To investigate the role of NANOS1, NANOS2, and NANOS3 genes in Chinese patients with POI.
  • To identify genetic variants in the NANOS gene family associated with POI.
  • To elucidate the functional impact of identified NANOS3 variants on protein stability and PGC regulation.

Main Methods:

  • Screening of coding regions of NANOS1, NANOS2, and NANOS3 in 100 Chinese POI patients.
  • Identification and characterization of genetic variants.
  • Assessment of NANOS3 protein stability and PGC-NANOS3 dosage relationship in mouse models.

Main Results:

  • Four variants were identified across NANOS1, NANOS2, and NANOS3 genes.
  • A potentially pathogenic mutation (c.457C>T; p.Arg153Trp) was found in NANOS3.
  • The p.Arg153Trp substitution reduced NANOS3 stability, indicating a hypomorphic effect.
  • Mouse models demonstrated that NANOS3 protein levels regulate PGC population size.

Conclusions:

  • NANOS3 mutations are implicated as a potential cause of primary ovarian insufficiency.
  • The study provides novel insights into NANOS3 protein function and its critical role in PGC maintenance.
  • Genetic screening of NANOS genes can aid in diagnosing POI.

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