Epstein-Barr virus U leader exon contains an internal ribosome entry site.

Abstract:

:Eukaryotic translation can be initiated either by a cap-dependent mechanism or by internal ribosome entry, a process by which ribosomes are directly recruited to structured regions of mRNA upstream of the initiation codon. Here we report the finding of an internal ribosome entry site (IRES) in the untranslated region of the Epstein-Barr nuclear antigen 1 (EBNA1) gene. EBNA1 is the only nuclear protein expressed in all known states of Epstein-Barr virus (EBV) latency and in the virus lytic cycle, and is required for the maintenance of the EBV episome. Using cDNA reporter constructs and in vitro transfection assays, we found that sequences contained in the 5' untranslated region (UTR) of the Fp and Qp initiated EBNA1 mRNA increased the expression level 4-14- fold in different Burkitt lymphoma cell lines. The U leader exon, located within the 5' UTR, included in all known EBNA1 transcripts and also contained in the EBNA3, 4 and 6 mRNAs, was demonstrated by bicistronic expression analyses to contain an IRES. The EBNA IRES initiates translation more efficiently than the encephalomyocarditis virus IRES in EBV-positive lymphoma cells. We propose that the EBNA IRES constitute a novel mechanism, whereby EBV regulates latent gene expression.

journal_name

Oncogene

journal_title

Oncogene

authors

Isaksson A,Berggren M,Ricksten A

doi

10.1038/sj.onc.1206149

subject

Has Abstract

pub_date

2003-01-30 00:00:00

pages

572-81

issue

4

eissn

0950-9232

issn

1476-5594

pii

1206149

journal_volume

22

pub_type

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