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Minichromosome maintenance complex component 8 (MCM8) gene mutations result in primary gonadal failure.

Journal of medical genetics (2015-04-16)
Yardena Tenenbaum-Rakover, Ariella Weinberg-Shukron, Paul Renbaum, Orit Lobel, Hasan Eideh, Suleyman Gulsuner, Dvir Dahary, Amal Abu-Rayyan, Moien Kanaan, Ephrat Levy-Lahad, Dani Bercovich, David Zangen
ABSTRACT

Primary gonadal failure is characterised by primary amenorrhoea or early menopause in females, and oligospermia or azoospermia in males. Variants of the minichromosome maintenance complex component 8 gene (MCM8) have recently been shown to be significantly associated with women's menopausal age in genome-wide association studies. Furthermore, MCM8-knockout mice are sterile. The objective of this study was to elucidate the genetic aetiology of gonadal failure in two consanguineous families presenting as primary amenorrhoea in the females and as small testes and azoospermia in a male. Using whole exome sequencing, we identified two novel homozygous mutations in the MCM8 gene: a splice (c.1954-1G>A) and a frameshift (c.1469-1470insTA). In each consanguineous family the mutation segregated with the disease and both mutations were absent in 100 ethnically matched controls. The splice mutation led to lack of the wild-type transcript and three different aberrant transcripts predicted to result in either truncated or significantly shorter proteins. Quantitative analysis of the aberrantly spliced transcripts showed a significant decrease in total MCM8 message in affected homozygotes for the mutation, and an intermediate decrease in heterozygous family members. Chromosomal breakage following exposure to mitomcyin C was significantly increased in cells from homozygous individuals for c.1954-1G>A, as well as c.1469-1470insTA. MCM8, a component of the pre-replication complex, is crucial for gonadal development and maintenance in humans-both males and females. These findings provide new insights into the genetic disorders of infertility and premature menopause in women.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Mitomycin C from Streptomyces caespitosus, powder, BioReagent, suitable for cell culture
Sigma-Aldrich
Mitomycin C from Streptomyces caespitosus, powder, contains NaCl as solubilizer
Sigma-Aldrich
Mitomycin C from Streptomyces caespitosus, ≥970 μg/mg (USP XXIV)