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Bub3 is a conserved component of the mitotic spindle assembly complex. The protein is essential for early development in  Bub3 gene-disrupted mice, evident from their failure to survive beyond day 6.5–7.5 postcoitus (pc).  Bub3  null embryos appear normal up to day 3.5 pc but accumulate mitotic errors from days 4.5–6.5 pc in the form of micronuclei, chromatin bridging, lagging chromosomes, and irregular nuclear morphology. Null embryos treated with a spindle-depolymerising agent fail to arrest in metaphase and show an increase in mitotic disarray. The results confirm Bub3 as a component of the essential spindle checkpoint pathway that operates during early embryogenesis.

Bub3 gene disruption in mice reveals essential mitotic spindle checkpoint function during early embryogenesis