Genetics of Early Ovarian Reserve Loss | Prof. Dr. İkbal Kaygusuz

Early Loss of Ovarian Reserve and Genetic Predisposition

In short: Women whose mother or sister had early menopause are more likely to lose ovarian reserve early. Known genetic causes include the fragile X premutation, X chromosome differences and some single-gene changes. Young women with a family history of early menopause are advised to check their reserve with AMH early, seek genetic counselling if needed and know about egg freezing.

Why does ovarian reserve vary?

Every woman is born with all the eggs she will have, and the number falls with age at a rate that varies widely. Genetics strongly influences the age of menopause: women whose mothers had early menopause are at higher risk.

Known genetic causes

Fragile X premutation (FMR1): the most common known single-gene cause of premature ovarian insufficiency; carriers have a markedly higher risk. It also matters for the risk of fragile X syndrome in children.
X chromosome differences: Turner syndrome and its mosaic forms, X chromosome deletions.
Single-gene changes: many genes involved in ovarian development and DNA repair have been identified.

Most women with premature ovarian insufficiency have no identified cause, but genetic assessment can provide important information for them and their female relatives.

Non-genetic factors

Smoking (can bring menopause forward by 1-2 years)
Ovarian surgery, especially for endometriomas
Chemotherapy and pelvic radiotherapy
Autoimmune disease

Who should check their reserve early?

Women whose mother or sister reached menopause before 45
Families with fragile X syndrome, intellectual disability or premature ovarian insufficiency
Women with previous ovarian surgery or endometriosis
Women facing cancer treatment
Women planning to delay pregnancy

What genetic counselling offers

The family history is assessed in detail, and chromosome analysis and FMR1 testing are planned when appropriate. Results guide reproductive planning, the option of embryo genetic testing (PGT) in IVF and information for relatives.

Prof. Dr. İkbal Kaygusuz's PhD in medical genetics brings an additional perspective to assessing the genetic side of reproductive health.

Options

For women at risk of early reserve loss with no near-term pregnancy plans, egg freezing is an important way to preserve fertility. Success depends mainly on age at freezing, so doing it before 35 is advised.

Frequently Asked Questions

My mother had early menopause. Will I?

Your risk is higher but not certain. Checking your reserve with AMH and antral follicle count helps you plan.

Who should have fragile X testing?

Women with premature ovarian insufficiency and those with a family history of fragile X syndrome or unexplained intellectual disability.

Sources

ESHRE Guideline: Management of women with premature ovarian insufficiency, 2024.
ACOG Committee Opinion No. 691: Carrier Screening for Genetic Conditions, 2017.

The information on this website is for general information only and does not replace a medical consultation.