| First Author | Park I | Year | 2013 |
| Journal | J Cell Biol | Volume | 202 |
| Issue | 2 | Pages | 295-309 |
| PubMed ID | 23878276 | Mgi Jnum | J:201641 |
| Mgi Id | MGI:5514492 | Doi | 10.1083/jcb.201210099 |
| Citation | Park I, et al. (2013) Loss of BubR1 acetylation causes defects in spindle assembly checkpoint signaling and promotes tumor formation. J Cell Biol 202(2):295-309 |
| abstractText | BubR1 acetylation is essential in mitosis. Mice heterozygous for the acetylation-deficient BubR1 allele (K243R/+) spontaneously developed tumors with massive chromosome missegregations. K243R/+ mouse embryonic fibroblasts (MEFs) exhibited a weakened spindle assembly checkpoint (SAC) with shortened mitotic timing. The generation of the SAC signal was intact, as Mad2 localization to the unattached kinetochore (KT) was unaltered; however, because of the premature degradation of K243R-BubR1, the mitotic checkpoint complex disassociated prematurely in the nocodazole-treated condition, suggesting that maintenance of the SAC is compromised. BubR1 acetylation was also required to counteract excessive Aurora B activity at the KT for stable chromosome-spindle attachments. The association of acetylation-deficient BubR1 with PP2A-B56alpha phosphatase was reduced, and the phosphorylated Ndc80 at the KT was elevated in K243R/+ MEFs. In relation, there was a marked increase of micronuclei and p53 mutation was frequently detected in primary tumors of K243R/+ mice. Collectively, the combined effects of failure in chromosome-spindle attachment and weakened SAC cause genetic instability and cancer in K243R/+ mice. |
