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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
5031439G07Rik/15:84832236-84832237-84832744-84832745--/- 5031439G07Rik protein_coding -/- interior 15:84832237-84832745 508.0 Mouse
5031439G07Rik/15:84832402-84832407-84833049-84833054--/- 5031439G07Rik protein_coding -/- interior 15:84832407-84833054 647.0 Mouse
5031439G07Rik/15:84832606-84832607-84833307-84833308--/- 5031439G07Rik protein_coding -/- interior 15:84832606-84833307 701.0 Mouse
5031439G07Rik/15:84832620-84832623-84832769-84832772--/- 5031439G07Rik protein_coding -/- interior 15:84832623-84832772 149.0 Mouse
5031439G07Rik/15:84832649-84832650-84833122-84833123--/- 5031439G07Rik protein_coding -/- interior 15:84832650-84833123 473.0 Mouse
5031439G07Rik/15:84833794-84833800-84834910-84834916--/- 5031439G07Rik protein_coding -/- interior 15:84833800-84834916 1116.0 Mouse
5031439G07Rik/15:84834818-84834823-84835436-84835441--/- 5031439G07Rik protein_coding -/- interior 15:84834823-84835441 618.0 Mouse
5031439G07Rik/15:84837329-84837330-84871925-84871926--/- 5031439G07Rik protein_coding -/- partial 15:84837330-84871926 34596.0 Mouse
5730522E02Rik/11:25905776-25905779-25905961-25905964--/- 5730522E02Rik protein_coding -/- interior 11:25905779-25905964 185.0 Mouse
5830417I10Rik/3:88728013-88728019-88723975-88723981-+/+ 5830417I10Rik unprocessed_pseudogene +/+ interior 3:88728013-88723975 4038.0 Mouse