Abstract
We have developed a simple cell-free system for studying the stability of different mRNAs in vitro. We demonstrate that the threefold greater stability in vivo of truncated c-myc mRNA (lacking exon 1) compared with that of full-length c-myc mRNA is maintained in our in vitro system. Chimeric mRNAs in which the first exon of c-myc was fused to immunoglobulin C alpha heavy chain or glyceraldehyde-3-phosphate dehydrogenase mRNAs were not rapidly degraded, demonstrating that c-myc exon 1 alone is not sufficient to tag mRNAs for rapid degradation. Competition experiments show that full-length c-myc mRNA is specifically recognized by a factor(s) responsible for its rapid degradation. This system will allow further characterization and purification of these factors.
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Selected References
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