BARE retrotransposons are translated and replicated via distinct RNA pools.

BARE retrotransposons are translated and replicated via distinct RNA pools.
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DOI:
10.1371/journal.pone.0072270
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Schulman AH
Schulman AH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chang W;Jääskeläinen M;Li SP;Schulman AH

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长末端重复序列(LTR)逆转录转座子的复制,可以构成超过80%的高等植物基因组,类似于逆转录病毒。逆转录转座子和逆转录病毒的一个主要问题是它们的转录本在翻译和逆转录中的两个相互冲突的角色如何平衡。在这里,我们表明,裸反转录转座子,尽管它的组织成一个开放的阅读框架,产生三个不同类别的成绩单。一种是加帽的,多聚腺苷酸化的,翻译的,但不能复制成cDNA。第二个未加帽或聚腺苷酸化,但注定用于包装和最终逆转录。第三类是加帽的,聚腺苷酸化的,并剪接以有利于仅编码Gag的亚基因组RNA的产生,Gag是形成病毒样颗粒的蛋白质。此外,BARE 2亚家族不能合成Gag并且寄生在BARE 1上,不产生用于翻译的剪接的亚基因组RNA,但确实产生可复制的转录物,其被包装到BARE 1颗粒中。据我们所知,这是第一次证明任何逆转录转座子的翻译和转录的不同RNA库。
The replication of Long Terminal Repeat (LTR) retrotransposons, which can constitute over 80% of higher plant genomes, resembles that of retroviruses. A major question for retrotransposons and retroviruses is how the two conflicting roles of their transcripts, in translation and reverse transcription, are balanced. Here, we show that the BARE retrotransposon, despite its organization into just one open reading frame, produces three distinct classes of transcripts. One is capped, polyadenylated, and translated, but cannot be copied into cDNA. The second is not capped or polyadenylated, but is destined for packaging and ultimate reverse transcription. The third class is capped, polyadenylated, and spliced to favor production of a subgenomic RNA encoding only Gag, the protein forming virus-like particles. Moreover, the BARE2 subfamily, which cannot synthesize Gag and is parasitic on BARE1, does not produce the spliced sub-genomic RNA for translation but does make the replication competent transcripts, which are packaged into BARE1 particles. To our knowledge, this is first demonstration of distinct RNA pools for translation and transcription for any retrotransposon.
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