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BUB3 is a conserved component of the mitotic spindle assembly complex and is an essential compent of spindle-assembly checkpoint (SAC) signaling that operates during early embryogenesis. BUB3 null embryos treated with a spindle-depolymerising agent fail to arrest in metaphase and show an increase in mitotic disarray. In mitosis, the SAC prevents anaphase onset until all chromosomes have been attached to the spindle microtubules and aligned correctly at the equatorial metaphase plate. BUB3 is involved in promoting the establishment of correct kinetochore-microtubule (K-MT) attachments in mammalian oocyte meiosis.