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:
影响因子:
--
通讯作者:
Xiao W
中科院分区:
文献类型:
--
作者:
Zhang J;Yu X;Guo P;Firrman J;Pouchnik D;Diao Y;Samulski RJ;Xiao W
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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