Minichromosome maintenance complex component 8 mutations cause primary ovarian insufficiency

Novel mutations p. H317L and p. H601R in the minichromosome maintenance complex component 8 (MCM8) gene are potentially causative for primary ovarian insufficiency by dysfunctional DNA repair, demonstrating contribution of MCM8 in maintenance of ovarian function.

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Volume 106, Issue 6, Pages 1485-1489

Authors:

Xiaoyun Dou, M.D., Ting Guo, M.D., Ph.D., Guangyu Li, M.S., LiGuang Zhou, M.D., Ph.D., Yingying Qin, M.D., Ph.D., Zi-Jiang Chen, M.D., Ph.D.

Abstract:

Objective

To investigate whether mutations in the minichromosome maintenance complex component 8 (MCM8) were present in 192 patients with sporadic primary ovarian insufficiency (POI).

Design

Retrospective case-control cohort study.

Setting

University-based reproductive medicine center.

Patient(s)

A total of 192 patients with sporadic POI and 312 control women with regular menstruation (192 age-matched women and 120 women >45 years old).

Intervention(s)

Sanger sequencing was performed in patients with sporadic POI, and potentially pathogenic variants were confirmed in matched controls. DNA damage was induced by mitomycinC (MMC) treatment, and DNA repair capacity was evaluated by histone H2AX phosphorylation level.

Main Outcome Measure(s)

Sanger sequencing for MCM8 was performed in 192 patients with sporadic POI, and functional experiments were performed to explore the deleterious effects of mutations identified.

Result(s)

Two novel missense variants in MCM8, c. A950T (p. H317L), and c. A1802G (p. H601R), were identified in two patients with POI but absent in 312 controls (the upper 90% confidence limit for the proportion 2/192 is 2.24%). The HeLa cells overexpressing mutant p. H317L and p. H601R showed higher sensitivity to MMC compared with wild type. Furthermore, mutant p. H317L showed decreased repair capacity after MMC treatment with much more histone H2AX phosphorylation remaining after 2 hours of recovery.

Conclusion(s)

Our result suggests novel mutations p. H317L and p. H601R in the MCM8 gene are potentially causative for POI by dysfunctional DNA repair.


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Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. The journal publishes juried original scientific articles in clinical and laboratory research relevant to reproductive endocrinology, urology, andrology, physiology, immunology, genetics, contraception, and menopause. Fertility and Sterility® encourages and supports meaningful basic and clinical research, and facilitates and promotes excellence in professional education, in the field of reproductive medicine.

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