Structural features and mechanism of translocation of non-LTR retrotransposons in Candida albicans.

Structural features and mechanism of translocation of non-LTR retrotransposons in Candida albicans.
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白色念珠菌非LTR反转录转座子的结构特征及易位机制

DOI:
10.4161/viru.27278
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发表时间:
2014-02-15
期刊:
影响因子:
5.2
通讯作者:
Cao Y
Cao Y
中科院分区:
生物学2区
文献类型:
--
作者:
Jiang J;Zhao L;Yan L;Zhang L;Cao Y;Wang Y;Jiang Y;Yan T;Cao Y

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许多被称为反转录转座子的丰富的可移动的遗传元件可以逆转录RNA以产生DNA插入到真核基因组中。非长末端重复序列(Non-Ltr)反转录转座子是一类主要的反转录转座子,而通过靶基因启动的逆转录运动的转座子缺乏逆转录病毒和逆转录病毒样转座子所特有的Ltrs。在白念珠菌和酿酒酵母中建立了酵母模型系统,用于研究非LTR反转录转座子。非LTR反转录转座子分为LINE(长散布核素)、SINES(短散布核素)和SVA(正弦、VNTR和Alu)。已经在真菌中描述了Line-1分子,并从白色念珠菌中检测到了几个称为Zorro分子的家族。他们都是L1分支的成员。通过一种名为靶启动逆转录(TPRT)的机制,LINEs将新拷贝转移到目标位置,以启动由断裂链的3‘OH启动的DNA合成。本文综述了白念珠菌中非LTR逆转录转座子的结构特征和来源的研究进展,并讨论了其逆转录和供体拷贝整合到靶点的机制。
A number of abundant mobile genetic elements called retrotransposons reverse transcribe RNA to generate DNA for insertion into eukaryotic genomes. Non-long-terminal repeat (non-LTR) retrotransposons represent a major class of retrotransposons, and transposons that move by target-primed reverse transcription lack LTRs characteristic of retroviruses and retroviral-like transposons. Yeast model systems in Candida albicans and Saccharomyces cerevisiae have been developed for the study of non-LTR retrotransposons. Non-LTR retrotransposons are divided into LINEs (long interspersed nuclear elements), SINEs (short interspersed nuclear elements), and SVA (SINE, VNTR, and Alu). LINE-1 elements have been described in fungi, and several families called Zorro elements have been detected from C. albicans. They are all members of L1 clades. Through a mechanism named target-primed reverse transcription (TPRT), LINEs translocate the new copy into the target site to initiate DNA synthesis primed by the 3′ OH of the broken strand. In this article, we describe some advances in the research on structural features and origin of non-LTR retrotransposons in C. albicans, and discuss mechanisms underlying their reverse transcription and integration of the donor copy into the target site.
在白色念珠菌返回跨座子TCA2中控制GAG-POL基因表达。
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发表时间: 2007-10-25
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发表时间: 2001-11-01
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