Coordinated poleward flux of sister kinetochore fibers drives chromosome alignment
Coordinated poleward flux of sister kinetochore fibers drives chromosome alignment
复制标题
姐妹动粒纤维的协调极向通量驱动染色体排列
DOI:
10.1101/2020.12.30.424837
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
I. Tolic
中科院分区:
文献类型:
--
作者:
Patrik Risteski;Domagoj Božan;Mihaela Jagrić;A. Bosilj;N. Pavin;I. Tolic
Chromosome alignment at the spindle equator promotes proper chromosome segregation and depends on pulling forces exerted at kinetochore fiber tips together with polar ejection forces. However, kinetochore fibers are also subjected to forces driving their poleward flux. Here we introduce a flux-driven centering model that relies on flux generated by forces within the overlaps of bridging and kinetochore fibers. This centering mechanism works so that the longer kinetochore fiber fluxes faster than the shorter one, moving the kinetochores towards the center. We developed speckle microscopy in human spindles and confirmed the key prediction that kinetochore fiber flux is length-dependent. Kinetochores are better centered when overlaps are shorter and the kinetochore fiber flux markedly slower than the bridging fiber flux. We identify Kif18A and Kif4A as overlap and flux regulators and NuMA as a fiber coupler. Thus, length-dependent sliding forces exerted by the bridging fiber onto kinetochore fibers promote chromosome alignment.
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影响因子:
3.3
作者:
Klemm AH;Bosilj A;Gluncˇic M;Pavin N;Tolic IM
通讯作者:
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11.8
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4
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3.3
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通讯作者:
Scholey, Jonathan M.