Nucleic Acids Research, 1986, Vol. 14, No. 17 7103-7114
© 1986
Articles |
Epstein-Barr virus mRNAs produced by alternative splicing
ER272 CNRS, Institut de Recherches Scientifiques sur le Cancer 94800 Villejuif, France
Received June 3, 1986. Revised August 7, 1986. Accepted August 7, 1986.
The structure of Epstein-Barr virus mRNAs transcribed in B95-8 cells has been studied by cDNA cloning and sequencing. We present here the analysis of four cDNAs. The corresponding mRNAs are probably transcribed from a single promoter located in the US region. They are produced by alternative splicing of exons transcribed from the US, IR and UL regions. The exons are spread over 100 kbp. The exons from the IR region constitute a unit which is repeated several times . The cDNAs share the exons from the US and IR regions. Some of the cDNAs also share some of the exons from the UL region. Each cDNA contains a long open reading frame or the 5' end of along open reading frame which ends several hundred nucleotides downstream on the viral genome. The 5' untranslated regions are unusually long. Three mRNA species differing in their 5' untranslated regions may encode for the nuclear antigen EBNA-1. The other mRNAs encode for polypeptides which may not have any common region.
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