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Construction of a bifunctional mRNA in the mouse by using the internal ribosomal entry site of the encephalomyocarditis virus.

Department of Life Science, POSTECH, Pohang, Republic of Korea.

ABSTRACT

Picornaviral mRNAs have been shown to possess special structures in their 5' nontranslated regions (5'NTRs) that provide sites for internal binding of ribosomes and thus direct cap-independent translation. The translational cis-acting elements for ribosomal internal entry into the 5'NTR of encephalomyocarditis virus (EMCV), a member of family Picornaviridae, have been named the internal ribosomal entry site (IRES). All of the published experiments regarding the IRES function of the picornavirus 5'NTR, however, were performed with cell extracts in vitro or with tissue culture cells in transient assay systems. In this study, we examined the IRES function of the EMCV 5'NTR in chimeric mouse embryos and demonstrated that this element does in fact work stably in mouse embryos as well as in embryonic stem (ES) cells. By using a dicistronic vector, pWH8, consisting of a promoter-driven neomycin resistance gene (neo) followed by the EMCV 5'NTR-lacZ sequence, we showed that more than half of the ES cells made G418 resistant by the vector stained positive for beta-galactosidase (beta-gal). On Northern (RNA) blots, all of the clones analyzed revealed a transcript of the expected size containing both the beta-gal and the neo cistrons. These results indicate that dicistronic mRNAs are produced from the stably integrated vector in those ES clones and that both of the cistrons are translated to produce functional proteins. The chimeric embryos derived from these ES clones also stained positive for beta-gal, suggesting that the bifunctional mRNAs are active in the embryos. This dicistronic vector system provides a novel tool by which to obtain temporally and spatially coordinated expression of two different genes driven by a single promoter in a single cell in mice.

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