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circRNA ID Gene Gene Type Strand (circRNA/Gene)
circRNA Type i

The back-fusion junctions (BFJs) of circRNAs from genic regions may have three possible positions relative to the nearest exon-intron boundaries of their cognate linear transcripts, giving rise to three circRNA subtypes:

(1) canonical (or completely boundary) circRNAs with both BFJs aligning to exon-intron boundaries;

(2) half interior (or half boundary) circRNAs with one, but not both, of the BFJs aligning to exon-intron boundaries;

(3) complete interior (or non-boundary) circRNAs with both junctions appearing inside of exons or introns.

Lariats are byproducts of splicing and can be regarded as variants of canonical circRNAs; for clarity, we list lariats separately here.

Intergenic circRNAs, derived from intergenic regions that often encode poorly annotated noncoding transcripts, can be considered a new distinct subtype of their own.

We collectively refer to complete interior, half interior, and intergenic circRNAs as noncanonical circRNAs (nc-circRNAs) to distinguish them from canonical circRNAs (c-circRNAs).

CircRNA Types Diagram
Position Length Species
4833439L19Rik/13:54699693-54699699-54700020-54700026--/- 4833439L19Rik protein_coding -/- interior 13:54699693-54700020 327.0 Mouse
4833439L19Rik/13:54699773-54699779-54700324-54700330--/- 4833439L19Rik protein_coding -/- interior 13:54699779-54700330 551.0 Mouse
4933407K13Rik/X:74774626-74774629-74779862-74779865--/- 4933407K13Rik lncRNA -/- canonical (exon-exon) X:74774626-74779862 5236.0 Mouse
4933416I08Rik/X:52610556-52610557-52610242-52610243-+/- 4933416I08Rik protein_coding +/- antisense X:52610557-52610243 314.0 Mouse
4933434E20Rik/3:89967985-89967993-89967556-89967564-+/+ 4933434E20Rik protein_coding +/+ interior 3:89967993-89967564 429.0 Mouse
5031425E22Rik/5:23589555-23589562-23589772-23589779--/- 5031425E22Rik lncRNA -/- interior 5:23589562-23589779 217.0 Mouse
5031439G07Rik/15:84828445-84828449-84829021-84829025--/- 5031439G07Rik protein_coding -/- interior 15:84828445-84829021 576.0 Mouse
5031439G07Rik/15:84829268-84829271-84832901-84832904--/- 5031439G07Rik protein_coding -/- interior 15:84829268-84832901 3633.0 Mouse
5031439G07Rik/15:84831690-84831695-84833240-84833245--/- 5031439G07Rik protein_coding -/- interior 15:84831690-84833240 1550.0 Mouse
5031439G07Rik/15:84831903-84831906-84832018-84832021--/- 5031439G07Rik protein_coding -/- interior 15:84831906-84832021 115.0 Mouse