Actin-dependent intranuclear repositioning of an active gene locus in vivo.

Actin-dependent intranuclear repositioning of an active gene locus in vivo.
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DOI:
10.1083/jcb.200710058
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发表时间:
2007-12-17
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Matera AG
Matera AG
中科院分区:
其他
文献类型:
--
作者:
Dundr M;Ospina JK;Sung MH;John S;Upender M;Ried T;Hager GL;Matera AG

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虽然大块染色质被认为在真核间期细胞核内具有有限的流动性,但定向长距离染色体运动并非未知。Cajal小体(CBs)是人类细胞间期与小核RNA (snRNA)和组蛋白基因位点非随机结合的核亚细胞器。然而,这种关联的机制尚不确定。在这项研究中,我们提出了一个实验系统来探索在活细胞转录激活过程中CBs与U2 snRNA靶基因位点的动态相互作用。同时对CBs和U2基因进行四维跟踪发现,靶位点是通过远距离染色体运动向相对稳定定位的CBs募集的。在β-actin的显性阴性突变体存在时,活化的U2基因的重新定位被明显抑制。这支持了核肌动蛋白是这些快速、远距离染色体运动所必需的模型。
Although bulk chromatin is thought to have limited mobility within the interphase eukaryotic nucleus, directed long-distance chromosome movements are not unknown. Cajal bodies (CBs) are nuclear suborganelles that nonrandomly associate with small nuclear RNA (snRNA) and histone gene loci in human cells during interphase. However, the mechanism responsible for this association is uncertain. In this study, we present an experimental system to probe the dynamic interplay of CBs with a U2 snRNA target gene locus during transcriptional activation in living cells. Simultaneous four-dimensional tracking of CBs and U2 genes reveals that target loci are recruited toward relatively stably positioned CBs by long-range chromosomal motion. In the presence of a dominant-negative mutant of β-actin, the repositioning of activated U2 genes is markedly inhibited. This supports a model in which nuclear actin is required for these rapid, long-range chromosomal movements.
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影响因子: 7.8
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