UV Irradiation Induces a Non-coding RNA that Functionally Opposes the Protein Encoded by the Same Gene …these events underlie a switch to expression of short mRNA isoforms and preferential use of alternative last exons in a number of genes, including ASCC3. Intriguingly, the switch between ASCC3 isoforms occurs on more than one level, in that the long mRNA isoform encodes a protein, functioning in the context of the ASCC complex and required for maintaining transcriptional suppression in the late stages of…