Heterozygosity for a Bub1 Mutation Causes Female-specific Germ Cell Aneuploidy in Mice

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2009 Jul 21

PMID 19617567

Citations 26

Authors

Shawn Leland

Prabakaran Nagarajan

Aris Polyzos

Sharon Thomas

George Samaan

Robert Donnell

Francesco Marchetti

Sundaresan Venkatachalam

Affiliations

Soon will be listed here.

Abstract

Aneuploidy, the most common chromosomal abnormality at birth and the main ascertained cause of pregnancy loss in humans, originates primarily from chromosome segregation errors during oogenesis. Here, we report that heterozygosity for a mutation in the mitotic checkpoint kinase gene, Bub1, induces aneuploidy in female germ cells of mice and that the effect increases with advancing maternal age. Analysis of Bub1 heterozygous oocytes showed that aneuploidy occurred primarily during the first meiotic division and involved premature sister chromatid separation. Furthermore, aneuploidy was inherited in zygotes and resulted in the loss of embryos after implantation. The incidence of aneuploidy in zygotes was sufficient to explain the reduced litter size in matings with Bub1 heterozygous females. No effects were seen in germ cells from heterozygous males. These findings show that Bub1 dysfunction is linked to inherited aneuploidy in female germ cells and may contribute to the maternal age-related increase in aneuploidy and pregnancy loss.

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