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Mitotic Checkpoint Imbalances in Familiar Cancer.

Numerical chromosomal aberrations are highly frequent in cancer cells. However, tumor-associated mutations in regulators of the mitotic machinery that controls chromosome segregation are rather rare. By sequencing families with hereditary cancer, Chen and colleagues report two novel heterozygous mutations in CDC20, a coactivator of the anaphase-promoting complex (APC/C) and a target of the spindle assembly checkpoint (SAC) that prevents chromosome missegregation during mitosis. CDC20 mutations result in partial SAC functionality and segregate with tumor susceptibility in families with aneuploid ovarian cancers and other malignancies. The expression of these mutations in a knock-in mouse model accelerates the development of Myc-induced lymphomas and mortality, strongly supporting the notion that partial dysfunction of mitotic regulators may have profound implications in spontaneous and hereditary cancer. See related article by Chen et al., p. 3499.