Chromosome fragments possessing only one kinetochore can congress to the spindle equator.

Chromosome fragments possessing only one kinetochore can congress to the spindle equator.
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DOI:
10.1083/jcb.136.2.229
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发表时间:
1997-01-27
影响因子:
7.8
通讯作者:
Rieder, CL
Rieder, CL
中科院分区:
生物学1区
文献类型:
--
作者:
Khodjakov, A;Cole, RW;McEwen, BF;Buttle, KF;Rieder, CL

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我们使用激光显微手术在生物定向的前中期染色体上的两个姐妹着丝点之间切割,产生两个包含一个着丝点(CF1K)的染色体片段。然后,这些cf1k中的每一个总是朝着它们的着丝点附着的纺锤极移动,然后开始单向染色体特征的朝极和离极振荡运动。然后,cf1k要么:(a)与该极密切相关,直到后期(50%),(b)移动(即聚集)到纺锤体赤道(38%),在随后的后期,它们通常(13/19个细胞)保持稳定的位置,或者(c)重新定向并移动到另一极(12%)。连接CF1Ks的行为与包含两个姊妹着丝点的连接染色体的行为难以区分。在后期稳定位于纺锤体赤道上的CF1Ks的三维电子显微镜层析成像重建显示,单个着丝点高度拉伸和/或断裂,并且来自相反纺锤极的许多微管终止在其结构中。这些观察结果表明,在染色体形成过程中,单个着丝点能够同时支持两个姊妹着丝点的功能,并暗示脊椎动物着丝点由多个结构域组成,其运动状态可以独立调节。
We used laser microsurgery to cut between the two sister kinetochores on bioriented prometaphase chromosomes to produce two chromosome fragments containing one kinetochore (CF1K). Each of these CF1Ks then always moved toward the spindle pole to which their kinetochores were attached before initiating the poleward and away-from-the-pole oscillatory motions characteristic of monooriented chromosomes. CF1Ks then either: (a) remained closely associated with this pole until anaphase (50%), (b) moved (i.e., congressed) to the spindle equator (38%), where they usually (13/19 cells) remained stably positioned throughout the ensuing anaphase, or (c) reoriented and moved to the other pole (12%). Behavior of congressing CF1Ks was indistinguishable from that of congressing chromosomes containing two sister kinetochores. Three-dimensional electron microscopic tomographic reconstructions of CF1Ks stably positioned on the spindle equator during anaphase revealed that the single kinetochore was highly stretched and/or fragmented and that numerous microtubules derived from the opposing spindle poles terminated in its structure. These observations reveal that a single kinetochore is capable of simultaneously supporting the function of two sister kinetochores during chromosome congression and imply that vertebrate kinetochores consist of multiple domains whose motility states can be regulated independently.
DOI: 10.1083/jcb.122.4.859
发表时间: 1993-08
期刊: The Journal of cell biology
影响因子: --
作者:
Skibbens RV;Skeen VP;Salmon ED
通讯作者: Salmon ED
DOI: 10.1016/0014-4827(75)90140-8
发表时间: 1975-01-01
影响因子: 3.7
作者:
HENEEN, WK
通讯作者: HENEEN, WK
DOI: 10.1083/jcb.135.2.315
发表时间: 1996-10-01
影响因子: 7.8
作者:
Khodjakov, A;Rieder, CL
通讯作者: Rieder, CL
响应染色体单向化的检查点延迟后期是由未连接的动物学产生的抑制信号介导的。
DOI: 10.1083/jcb.130.4.941
发表时间: 1995-08
影响因子: 7.8
作者:
RIEDER, CL;COLE, RW;KHODJAKOV, A;SLUDER, G
通讯作者: SLUDER, G
DOI: 10.1083/jcb.127.5.1301
发表时间: 1994-12-01
影响因子: 7.8
作者:
RIEDER, CL;SCHULTZ, A;SLUDER, G
通讯作者: SLUDER, G