Combinatorial control of Drosophila circular RNA expression by intronic repeats, hnRNPs, and SR proteins

  • Kramer M
  • Liang D
  • Tatomer D
 et al. 
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Thousands of eukaryotic protein-coding genes are noncanonically spliced to produce circular RNAs. Bioinformatics has indicated that long introns generally flank exons that circularize in Drosophila, but the underlying mechanisms by which these circular RNAs are generated are largely unknown. Here, using extensive mutagenesis of expression plasmids and RNAi screening, we reveal that circularization of the Drosophila laccase2 gene is regulated by both intronic repeats and trans-acting splicing factors. Analogous to what has been observed in humans and mice, base-pairing between highly complementary transposable elements facilitates backsplicing. Long flanking repeats (∼400 nucleotides [nt]) promote circularization cotranscriptionally, whereas pre-mRNAs containing minimal repeats (

Author-supplied keywords

  • CircRNA
  • Laccase2
  • Noncoding RNA
  • PlexA
  • Repetitive element
  • hnRNP
  • pre-mRNA splicing

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  • Marianne C. Kramer

  • Dongming Liang

  • Deirdre C. Tatomer

  • Beth Gold

  • Zachary M. March

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