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Research Papers
McArdle Laboratory for Cancer Research, University of Wisconsin, Madison 53706-1559, USA.
Abstract
Most pre-mRNAs require an intron for efficient processing in higher eukaryotes. To test the hypothesis that intron-independent gene expression involves positive, cis-acting RNA sequence elements, we constructed chimeric genes in which various regions of the naturally intronless HSV-TK gene were inserted into an intronless variant of the highly intron-dependent human beta-globin gene. Using a transient transfection assay, we identified a 119-nucleotide sequence element contained within the transcribed region of the HSV-TK gene that enables efficient cytoplasmic accumulation of globin RNA in the absence of splicing. RNA UV-cross-linking assays indicated that a 68-kD protein present in nuclear extracts of HeLa and COS cells specifically binds to this HSV-TK sequence element. This 68-kD protein was found to cross-react with an antiserum specific to hnRNP L. Recombinant hnRNP L was shown to bind with high sequence specificity to this RNA sequence element. Analysis of substitution mutants in this element indicated that binding of hnRNP L correlates with accumulation of the RNA in the cytoplasm. Thus, we conclude that (1) hnRNP L binds in a sequence-specific manner to this RNA sequence element that enables intron-independent gene expression, and (2) intron-independent pre-mRNA processing and transport involves sequence-specific RNA-protein interactions between cis-acting RNA sequence elements and proteins such as hnRNP L. This sequence element may be of general use for the efficient expression of cDNA versions of intron-dependent genes.
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