Block to the Production of Full-Length B19 Virus Transcripts by Internal Polyadenylation Is Overcome by Replication of the Viral Genome

Author:

Guan Wuxiang1,Cheng Fang1,Yoto Yuko2,Kleiboeker Steve3,Wong Susan4,Zhi Ning4,Pintel David J.2,Qiu Jianming1

Affiliation:

1. Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas

2. Department of Molecular Microbiology and Immunology, University of Missouri-Columbia, Columbia, Missouri

3. ViraCor Laboratories, Lee's Summit, Missouri 64086

4. Hematology Branch, National Heart, Lung and Blood Institute, Bethesda, Maryland

Abstract

ABSTRACT The pre-mRNA processing strategy of the B19 virus is unique among parvoviruses. B19 virus-generated pre-mRNAs are transcribed from a single promoter and are extensively processed by alternative splicing and alternative polyadenylation to generate 12 transcripts. Blockage of the production of full-length B19 virus transcripts at the internal polyadenylation site [(pA)p] was previously reported to be a limiting step in B19 virus permissiveness. We show here that in the absence of genome replication, internal polyadenylation of B19 virus RNAs at (pA)p is favored in cells which are both permissive and nonpermissive for B19 viral replication. Replication of the B19 virus genome, however, introduced either by viral infection or by transfection of an infectious clone into permissive cells or forced by heterologous replication systems in nonpermissive cells, enhanced readthrough of (pA)p and the polyadenylation of B19 virus transcripts at the distal site [(pA)d]. Therefore, replication of the genome facilitates the generation of sufficient full-length transcripts that encode the viral capsid proteins and the essential 11-kDa nonstructural protein. Furthermore, we show that polyadenylation of B19 viral RNA at (pA)p likely competes with splicing at the second intron. Thus, we conclude that replication of the B19 virus genome is the primary limiting step governing B19 virus tropism.

Publisher

American Society for Microbiology

Subject

Virology,Insect Science,Immunology,Microbiology

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