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Cajal bodies (CBs) and Gems are nuclear domains that contain factors responsible for spliceosomal small nuclear ribonucleoprotein
(snRNP) biogenesis. The marker protein for CBs is coilin. In addition to snRNPs, coilin and other factors, canonical CBs contain
the survivor of motor neuron protein (SMN). SMN can also localize to Gems. Considering the important role that coilin plays
in the formation and composition of CBs, we tested the splicing efficiency of several cell lines that vary in regards to coilin
level and modification using an artificial reporter substrate. We found that cells with both hypomethylated coilin and Gems
are more efficient at reporter splicing compared to cells in which SMN localizes to CBs. In contrast, coilin reduction, which
induces Gem formation, decreases cell proliferation and artificial reporter splicing. These findings demonstrate that coilin
modifications or levels impact artificial reporter splicing, possibly by influencing snRNP biogenesis.
Received 26 December 2007; received after revision 5 February 2008; accepted 7 February 2008 相似文献
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在介绍TMN的概念、作用及其功能体系结构和物理体系结构的基础上,详细介绍了基于TMN的SDH体系结构、管理功能以及接口协议等. 相似文献
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Chlebova K Bryja V Dvorak P Kozubik A Wilcox WR Krejci P 《Cellular and molecular life sciences : CMLS》2009,66(2):225-235
Fibroblast growth factor 2 (FGF2) is one of the most studied growth factors to date. Most attention has been dedicated to
the smallest, 18kDa FGF2 variant that is released by cells and acts through activation of cell-surface FGF-receptor tyrosine
kinases. There are, however, several higher molecular weight (HMW) variants of FGF2 that rarely leave their producing cells,
are retained in the nucleus and act independently of FGF-receptors (FGFR). Despite significant evidence documenting the expression
and intracellular trafficking of HMW FGF2, many important questions remain about the physiological roles and mechanisms of
action of HMW FGF2. In this review, we summarize the current knowledge about the biology of HMW FGF2, its role in disease
and areas for future investigation.
Received 28 July 2008; received after revision 18 August 2008; accepted 22 August 2008 相似文献
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提出了一种基于 CORBA的分布式 SDH网络管理结构 ,其中 ,引擎的概念在分布式异构环境下继承和发展了 SMN的分层管理思想和组织模型 ,由它所构成的引擎组在 CORBA服务和扩展服务支持下 ,能很好地完成 SMN的各层管理功能 .新的网络管理结构还提供了网关模块 ,以实现与采用 CMIP协议或 SNMP协议的 SMN系统互连 相似文献
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