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. 2019 Jan 15;11(1):1–15.

Table 1.

Characteristics of different types of circRNAs

Name Type Location Joint site Sequence feature Function
ciRNA Intron Nucleus 2’-5’ phosphodiester bond Enrichment of 5’ splice site containing 7 GU motif, enrichment of 3’ branch site containting 11 C motif Regulation of gene transcription
EIciRNA Exon-intron Nucleus 3’-5’ phosphodiester bond Circularization exons containing the reverse complementary sequence of introns and selective circularization Regulation of gene transcription
ecRNA Exon Cytoplasms 3’-5’ phosphodiester bond Circularization exons containing the reverse complementary sequence of introns and selective cyclization MiRNA sponges; interaction with RBP; translation

ecRNA: Exonic circRNA; ciRNA: Intronic circRNA; EIciRNA: Exon-intronic circRNA.