Kalitsis P, Earle E, Fowler K J, Choo K H
Murdoch Children's Research Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Melbourne, Australia.
Genes Dev. 2000 Sep 15;14(18):2277-82. doi: 10.1101/gad.827500.
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是有丝分裂纺锤体组装复合体的一个保守组分。该蛋白对于Bub3基因敲除小鼠的早期发育至关重要,这从它们在交配后(pc)6.5 - 7.5天之后无法存活便可明显看出。Bub3基因敲除胚胎在pc 3.5天之前看起来正常,但从pc 4.5 - 6.5天开始以微核、染色质桥接、落后染色体和不规则核形态的形式积累有丝分裂错误。用纺锤体解聚剂处理的基因敲除胚胎无法在中期停滞,并显示有丝分裂紊乱增加。这些结果证实Bub3是在早期胚胎发生过程中起作用的必需纺锤体检查点途径的一个组分。