Kinetochore-microtubule attachment is sufficient to satisfy the human spindle assembly checkpoint.

Nature communications (2015-12-02)
Banafsheh Etemad, Timo E F Kuijt, Geert J P L Kops

The spindle assembly checkpoint (SAC) is a genome surveillance mechanism that protects against aneuploidization. Despite profound progress on understanding mechanisms of its activation, it remains unknown what aspect of chromosome-spindle interactions is monitored by the SAC: kinetochore-microtubule attachment or the force generated by dynamic microtubules that signals stable biorientation of chromosomes? To answer this, we uncoupled these two processes by expressing a non-phosphorylatable version of the main microtubule-binding protein at kinetochores (HEC1-9A), causing stabilization of incorrect kinetochore-microtubule attachments despite persistent activity of the error-correction machinery. The SAC is fully functional in HEC1-9A-expressing cells, yet cells in which chromosomes cannot biorient but are stably attached to microtubules satisfy the SAC and exit mitosis. SAC satisfaction requires neither intra-kinetochore stretching nor dynamic microtubules. Our findings support the hypothesis that in human cells the end-on interactions of microtubules with kinetochores are sufficient to satisfy the SAC without the need for microtubule-based pulling forces.

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Monoclonal Anti-α-Tubulin antibody produced in mouse, ascites fluid, clone B-5-1-2
Anti-γ-Tubulin antibody produced in rabbit, affinity isolated antibody, buffered aqueous solution

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