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2015 ; 14
(21
): 3356-61
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Dynein prevents erroneous kinetochore-microtubule attachments in mitosis
#MMPMID26397382
Barisic M
; Maiato H
Cell Cycle
2015[]; 14
(21
): 3356-61
PMID26397382
show ga
Equal distribution of the genetic material during cell division relies on
efficient congression of chromosomes to the metaphase plate. Prior to their
alignment, the Dynein motor recruited to kinetochores transports a fraction of
laterally-attached chromosomes along microtubules toward the spindle poles. By
doing that, Dynein not only contributes to chromosome movements, but also
prevents premature stabilization of end-on kinetochore-microtubule attachments.
This is achieved by 2 parallel mechanisms: 1) Dynein-mediated poleward movement
of chromosomes counteracts opposite polar-ejection forces (PEFs) on chromosome
arms by the microtubule plus-end-directed motors chromokinesins. Otherwise, they
could stabilize erroneous syntelic kinetochore-microtubule attachments and lead
to the random ejection of chromosomes away from the spindle poles; and 2) By
transporting chromosomes to the spindle poles, Dynein brings the former to the
zone of highest Aurora A kinase activity, further destabilizing
kinetochore-microtubule attachments. Thus, Dynein plays an important role in
keeping chromosome segregation error-free by preventing premature stabilization
of kinetochore-microtubule attachments near the spindle poles.