纺锤体组装检测点基因BubR1的研究进展

BubR1是酵母细胞有丝分裂监测点基因家族Mad3的同源基因,在哺乳动物中高度保守,其编码的蛋白是纺锤体检测点的重要组成成分之一.BubR1通过参与监测有丝分裂过程中微管与着丝点间的结合状态,感受着丝点上张力的情况来确保染色体的正确分离,以及细胞有丝分裂过程.BubR1的表达水平与纺锤体检测点的功能存在一定的剂量依赖效应,该基因一旦缺失将引起大量非整倍体的产生,从而引发纺锤体检测点的妥协反应.近来有关BubR1的功能和作用机制等方面引起了越来越多研究人员的关注.研究发现,BubR1不仅监控细胞有丝分裂的正常过程,而且在细胞减数分裂、DNA损伤应答、肿瘤、不孕和衰老等方面也发挥着重要的作用.

Research progress on spindle assembly checkpoint gene BubR1

BubR1 gene is a homologue of the mitotic checkpoint gene Mad3 in budding yeast which is highly conserved in mammalian. BubR1 protein is a key component mediating spindle assembly checkpoint activation. BubR1 safeguards accurate chromosome segregation during cell division by monitoring kinetochore-microtubule attachments and kinetochore tension. There is a dose-dependent effect between the level of BubR1 expression and the function of spindle assembly checkpoint. BubR1-deficient would lead to mitotic progression with compromised spindle assembly checkpoint because cells become progressively aneuploid. Recently, it has been reported that BubR1 also plays important roles in meiotic, DNA damage response, cancer, infertility, and early aging. This review briefly summarizes the current progresses in studies of BubR1 function.