Satellite Subgenomic Particles Are Key Regulators of Adeno-Associated Virus Life Cycle.

Satellite Subgenomic Particles Are Key Regulators of Adeno-Associated Virus Life Cycle.
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DOI:
10.3390/v13061185
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发表时间:
2021-06-21
期刊:
Viruses
影响因子:
--
通讯作者:
Xiao W
Xiao W
中科院分区:
其他
文献类型:
--
作者:
Zhang J;Yu X;Guo P;Firrman J;Pouchnik D;Diao Y;Samulski RJ;Xiao W

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历史上,腺相关病毒(AAV)缺陷干扰颗粒(DI)被称为由自然复制和衣壳错误引起的异常病毒体。通过单病毒体基因组分析,我们揭示了 DI 颗粒的主要类别包含“弹回”配置的双链 DNA 基因组。 5'-snapback 基因组 (SBG) 包括 P5 启动子和部分 rep 基因序列。 3'-SBG 包含衣壳区域。理论上,5'-SBG 的分子构型可能允许双链 RNA 以二聚体构型进行转录。我们的研究表明 5-SBG 调节 AAV 表达并改善 AAV 包装。相比之下,二聚体构型的 3'-SBG 增加了帽蛋白的水平。 5'-SBG 和 3'-SBG 的产生和积累似乎是协调的,以平衡病毒基因表达水平。因此,5'-SBGs和3'-SBGs的功能可能有助于最大限度地提高AAV后代的产量。我们假设 AAV 病毒群体表现得像一个菌落,并利用其亚基因组颗粒克服病毒基因组的大小限制并编码额外的基本功能。
Historically, adeno-associated virus (AAV)-defective interfering particles (DI) were known as abnormal virions arising from natural replication and encapsidation errors. Through single virion genome analysis, we revealed that a major category of DI particles contains a double-stranded DNA genome in a “snapback” configuration. The 5′- snapback genomes (SBGs) include the P5 promoters and partial rep gene sequences. The 3′-SBGs contains the capsid region. The molecular configuration of 5′-SBGs theoretically may allow double-stranded RNA transcription in their dimer configuration. Our studies demonstrated that 5-SBG regulated AAV rep expression and improved AAV packaging. In contrast, 3′-SBGs at its dimer configuration increased levels of cap protein. The generation and accumulation of 5′-SBGs and 3′-SBGs appears to be coordinated to balance the viral gene expression level. Therefore, the functions of 5′-SBGs and 3′-SBGs may help maximize the yield of AAV progenies. We postulate that AAV virus population behaved as a colony and utilizes its subgenomic particles to overcome the size limit of a viral genome and encodes additional essential functions.
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