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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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Related Experiment Video

Updated: Jun 20, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Inhibin and premature ovarian failure.

A L Chand¹, C A Harrison, A N Shelling

¹Prince Henry's Institute of Medical Research, Clayton, VIC 3168, Australia. ashwini.chand@princehenrys.org

Human Reproduction Update

|September 16, 2009

Summary

A mutation in the inhibin alpha subunit gene (INHA G769A) is linked to premature ovarian failure (POF). This genetic change may increase POF susceptibility, particularly in certain populations.

Area of Science:

Genetics
Reproductive Biology
Endocrinology

Background:

Premature ovarian failure (POF) is a heterogeneous condition with complex causes.
Inhibin is implicated in POF due to its roles in FSH regulation and gametogenesis.
A specific missense mutation (INHA G769A) in the inhibin alpha subunit gene is associated with POF, but exhibits phenotypic heterogeneity.

Purpose of the Study:

To investigate the association between the INHA G769A mutation and premature ovarian failure.
To explore the potential role of inhibin gene mutations in the etiology of POF.

Main Methods:

A meta-analysis of published studies was conducted.
PubMed was searched to identify relevant studies.
Mutational frequencies were combined for meta-analysis.

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Last Updated: Jun 20, 2026

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Main Results:

Meta-analysis indicated a risk difference of 0.04 for POF associated with the INHA G769A mutation.
Asymptomatic carriers suggest incomplete penetrance or multi-genetic factors in POF.
Functional studies revealed impaired bioactivity of inhibin B, despite normal production of dimeric inhibin A and B.

Conclusions:

An autosomal mutation in the inhibin alpha subunit gene (INHA G769A) is significantly linked to POF in specific ethnic groups.
This mutation highlights the critical role of inhibin in ovarian function and fertility.
The INHA G769A mutation acts as a susceptibility factor for POF by potentially reducing inhibin B bioactivity and increasing FSH levels.