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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
2310022B05Rik/8:125378111-125378112-125389762-125389763--/- 2310022B05Rik protein_coding -/- partial 8:125378112-125389763 11651.0 Mouse
2410002F23Rik/7:43900316-43900322-43900139-43900145-+/+ 2410002F23Rik protein_coding +/+ interior 7:43900316-43900139 177.0 Mouse
2410002F23Rik/7:43900466-43900472-43900112-43900118-+/+ 2410002F23Rik protein_coding +/+ interior 7:43900472-43900118 354.0 Mouse
2410002F23Rik/7:43900494-43900495-43900164-43900165-+/+ 2410002F23Rik protein_coding +/+ interior 7:43900495-43900165 330.0 Mouse
2410002F23Rik/7:43900649-43900652-43900358-43900361-+/+ 2410002F23Rik protein_coding +/+ interior 7:43900652-43900361 291.0 Mouse
2410002F23Rik/7:43900727-43900731-43900413-43900417-+/+ 2410002F23Rik protein_coding +/+ interior 7:43900731-43900417 314.0 Mouse
2410018L13Rik/12:23040030-23040038-23040282-23040290--/- 2410018L13Rik lncRNA -/- interior 12:23040038-23040290 252.0 Mouse
2510039O18Rik/4:148029641-148029647-148029269-148029275-+/+ 2510039O18Rik protein_coding +/+ interior 4:148029641-148029269 372.0 Mouse
2510039O18Rik/4:148029718-148029719-148029547-148029548-+/+ 2510039O18Rik protein_coding +/+ interior 4:148029718-148029547 171.0 Mouse
2610005L07Rik/8:20044957-20044959-20044843-20044845-+/+ 2610005L07Rik lncRNA +/+ interior 8:20044957-20044843 114.0 Mouse