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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
1500035N22Rik/5:25191000-25191000-25190853-25190853-+/+ 1500035N22Rik lncRNA +/+ interior 5:25191000-25190853 147.0 Mouse
1700010K23Rik/16:66454907-66454908-66454719-66454720-+/+ 1700010K23Rik lncRNA +/+ interior 16:66454908-66454720 188.0 Mouse
1810055G02Rik/19:3767704-3767706-3766791-3766793-+/+ 1810055G02Rik protein_coding +/+ interior 19:3767706-3766793 913.0 Mouse
2210016L21Rik/5:115085976-115085977-115085841-115085842-+/+ 2210016L21Rik protein_coding +/+ interior 5:115085976-115085841 135.0 Mouse
2210016L21Rik/5:115086190-115086190-115086084-115086084-+/+ 2210016L21Rik protein_coding +/+ interior 5:115086190-115086084 106.0 Mouse
2210016L21Rik/5:115086240-115086241-115086094-115086095-+/+ 2210016L21Rik protein_coding +/+ interior 5:115086240-115086094 146.0 Mouse
2210016L21Rik/5:115086287-115086289-115086005-115086007-+/+ 2210016L21Rik protein_coding +/+ interior 5:115086289-115086007 282.0 Mouse
2210408I21Rik/13:77341341-77341342-77340671-77340672-+/+ 2210408I21Rik protein_coding +/+ canonical (exon-exon) 13:77341341-77340671 670.0 Mouse
2310022B05Rik/8:125363603-125363612-125363737-125363746--/- 2310022B05Rik protein_coding -/- interior 8:125363603-125363737 134.0 Mouse
2310022B05Rik/8:125364733-125364733-125365829-125365829--/- 2310022B05Rik protein_coding -/- lariat 8:125364733-125365829 1096.0 Mouse