Inactivating the spindle checkpoint kinase Bub1 during embryonic development results in a global shutdown of proliferation.
2009
Background
Bub1 is a component of the spindle assembly checkpoint, a surveillance mechanism that maintains chromosome stability during M-phase. Bub1 is essential during the early stages of embryogenesis, with homozygous BUB1-null mice dying shortly after day E3.5. Bub1 is also required later during embryogenesis; inactivation of BUB1 on day E10.5 appears to rapidly block all further development. However, the mechanism(s) responsible for this phenotype remain unclear.
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