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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
2610008E11Rik/10:78902429-78902434-78902933-78902938--/- 2610008E11Rik protein_coding -/- interior 10:78902434-78902938 504.0 Mouse
2610008E11Rik/10:78902969-78902974-78903253-78903258--/- 2610008E11Rik protein_coding -/- interior 10:78902969-78903253 284.0 Mouse
2610020C07Rik/16:11035631-11035637-11035801-11035807--/+ 2610020C07Rik lncRNA -/+ antisense 16:11035631-11035801 170.0 Mouse
2610020C07Rik/16:11035707-11035709-11036280-11036282--/+ 2610020C07Rik lncRNA -/+ antisense 16:11035707-11036280 573.0 Mouse
2610203C22Rik/1:9695268-9695272-9695775-9695779--/- 2610203C22Rik lncRNA -/- interior 1:9695272-9695779 507.0 Mouse
2610307P16Rik/13:28852348-28852349-28853973-28853974--/- 2610307P16Rik lncRNA -/- interior 13:28852349-28853974 1625.0 Mouse
2610307P16Rik/13:28852348-28852351-28853973-28853976--/- 2610307P16Rik lncRNA -/- partial 13:28852351-28853976 1625.0 Mouse
2610307P16Rik/13:28852349-28852350-28852684-28852685--/- 2610307P16Rik lncRNA -/- interior 13:28852350-28852685 335.0 Mouse
2610307P16Rik/13:28852356-28852357-28853981-28853982--/- 2610307P16Rik lncRNA -/- interior 13:28852356-28853981 1625.0 Mouse
2810001A02Rik/15:86098216-86098216-86098407-86098407--/- 2810001A02Rik lncRNA -/- interior 15:86098216-86098407 191.0 Mouse