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Significance Long interspersed element-1s (L1s) encode 2 proteins (ORF1p and ORF2p) that preferentially mobilize (i.e., retrotranspose) their encoding messenger RNA (mRNA) transcript. ORF1p and/or ORF2p can also mobilize other cellular RNAs, including short interspersed elements (SINEs), U6 small nuclear RNA (snRNA), and mRNAs. Here, we demonstrate the RNA ligase RtcB can join U6 snRNA to L1 or other cellular RNAs to create chimeric RNAs; retrotransposition of the resultant chimeric RNAs leads to chimeric pseudogene formation; and chimeric U6/L1 RNAs are part of the transcriptome in multiple human cells. These data suggest RNA ligation contributes to the plasticity of the transcriptome and that the retrotransposition of chimeric RNAs can generate genetic variation in the human genome.

RNA ligation precedes the retrotransposition of U6/LINE-1 chimeric RNA