Defects in centromeric/pericentromeric histone H2A T120 phosphorylation by hBUB1 cause chromosome missegregation producing multinucleated cells.

Histone H2A phosphorylation plays a role both in chromatin condensation during mitosis and in transcriptional activation during the G1/S transition. Bub1 and NHK1/VRK1 have been identified as histone H2A kinases. However, little is known about the importance of histone H2A phosphorylation in chromosome segregation.