LINE-1 RNA splicing and influences on mammalian gene expression.

LINE-1 RNA splicing and influences on mammalian gene expression.
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LINE-1 RNA剪接和对哺乳动物基因表达的影响。

DOI:
10.1093/nar/gkl027
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发表时间:
2006
影响因子:
14.9
通讯作者:
Deininger, P
Deininger, P
中科院分区:
生物学2区
文献类型:
--
作者:
Belancio, VP;Hedges, DJ;Deininger, P

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长散在元件 - 1(Long interspersed element - 1,L1)平均占哺乳动物基因组的五分之一。为了限制其在生殖细胞和体细胞中的损害,L1的表达和逆转录转座受到多种细胞机制的限制。在大多数组织中,L1转录在很大程度上受到抑制,但在睾丸、一些特定的体细胞类型以及恶性肿瘤中仍可检测到L1 mRNA和/或蛋白质。通过过早多聚腺苷酸化对L1表达的下调已被发现是限制L1表达的一种次要机制。我们证明哺乳动物的L1元件包含许多功能性剪接供体和受体位点。对其中一些位点的有效利用导致L1广泛而复杂的剪接。人类和小鼠L1元件的几种剪接变体都经历逆转录转座。一些剪接的L1 mRNA可能有助于开放阅读框2相关产物的表达,因此,即使它们不能进行L1逆转录转座,也对短散在元件(SINEs)的移动性有影响。对人类表达序列标签(EST)数据库的分析显示,L1元件也参与与其他基因的剪接事件。L1提供功能性剪接位点可能导致正常基因表达的中断或形成选择性mRNA转录本。
Long interspersed element-1 elements compose on average one-fifth of mammalian genomes. The expression and retrotransposition of L1 is restricted by a number of cellular mechanisms in order to limit their damage in both germ-line and somatic cells. L1 transcription is largely suppressed in most tissues, but L1 mRNA and/or proteins are still detectable in testes, a number of specific somatic cell types, and malignancies. Down-regulation of L1 expression via premature polyadenylation has been found to be a secondary mechanism of limiting L1 expression. We demonstrate that mammalian L1 elements contain numerous functional splice donor and acceptor sites. Efficient usage of some of these sites results in extensive and complex splicing of L1. Several splice variants of both the human and mouse L1 elements undergo retrotransposition. Some of the spliced L1 mRNAs can potentially contribute to expression ofopen reading frame 2-related products and therefore have implications for the mobility of SINEs even if they are incompetent for L1 retrotransposition. Analysis of the human EST database revealed that L1 elements also participate in splicing events with other genes. Such contribution of functional splice sites by L1 may result in disruption of normal gene expression or formation of alternative mRNA transcripts.
DOI: 10.1073/pnas.0831042100
发表时间: 2003-04-29
影响因子: 11.1
作者:
Brouha, B;Schustak, J;Kazazian, HH
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DOI: 10.1038/ng1223
发表时间: 2003-09-01
期刊: NATURE GENETICS
影响因子: 30.8
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发表时间: 2004-05-20
期刊: NATURE
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发表时间: 2005-11-01
影响因子: 3.5
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通讯作者: Moran, JV
DOI: 10.1038/sj.ejhg.5200523
发表时间: 2000-09-01
影响因子: 5.2
作者:
Meischl, C;de Boer, M;Roos, D
通讯作者: Roos, D