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Title: Homologous SV40 RNA trans-splicing: A new mechanism for diversification of viral sequences and phenotypes
Authors: Eul, Joachim
Volker Patzel 
Keywords: SV40 100 kD super T antigen
alternative splicing
cell transformation
molecular basis of diseases
viral gene expression
Alternative Splicing
Antigens, Viral, Tumor
Base Sequence
Binding Sites
Cell Line
RNA Splice Sites
RNA, Viral
Simian virus 40
Issue Date: 1-Nov-2013
Publisher: Taylor & Francis
Source: Eul, Joachim, Volker Patzel (2013-11-01). Homologous SV40 RNA trans-splicing: A new mechanism for diversification of viral sequences and phenotypes. RNA Biology 10 (11) : 1689-1699. ScholarBank@NUS Repository.
Abstract: Simian Virus 40 (SV40) is a polyomavirus found in both monkeys and humans, which causes cancer in some animal models. In humans, SV40 has been reported to be associated with cancers but causality has not been proven yet. The transforming activity of SV40 is mainly due to its 94-kD large T antigen, which binds to the retinoblastoma (pRb) and p53 tumor suppressor proteins, and thereby perturbs their functions. Here we describe a 100 kD super T antigen harboring a duplication of the pRB binding domain that was associated with unusual high cell transformation activity and that was generated by a novel mechanism involving homologous RNA trans-splicing of SV40 early transcripts in transformed rodent cells. Enhanced trans-splice activity was observed in clones carrying a single point mutation in the large T antigen 5' donor splice site (ss). This mutation impaired cis-splicing in favor of an alternative trans-splice reaction via a cryptic 5'ss within a second cis-spliced SV40 pre-mRNA molecule and enabled detectable gene expression. Next to the cryptic 5'ss we identified additional trans-splice helper functions, including putative dimerization domains and a splice enhancer sequence. Our findings suggest RNA trans-splicing as a SV40-intrinsic mechanism that supports the diversification of viral RNA and phenotypes.
Source Title: RNA Biology
ISSN: 15476286
DOI: 10.4161/rna.26707
Appears in Collections:Staff Publications

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