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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
9330111N05Rik/13:81214220-81214225-81213920-81213925-+/+ 9330111N05Rik lncRNA +/+ interior 13:81214225-81213925 300.0 Mouse
9330111N05Rik/13:81214360-81214361-81213161-81213162-+/+ 9330111N05Rik lncRNA +/+ interior 13:81214360-81213161 1199.0 Mouse
9330159F19Rik/10:29100814-29100822-29100562-29100570-+/+ 9330159F19Rik protein_coding +/+ interior 10:29100814-29100562 252.0 Mouse
9330159F19Rik/10:29100918-29100926-29100441-29100449-+/+ 9330159F19Rik protein_coding +/+ interior 10:29100918-29100441 477.0 Mouse
9330159F19Rik/10:29101010-29101014-29100458-29100462-+/+ 9330159F19Rik protein_coding +/+ interior 10:29101010-29100458 552.0 Mouse
9330159F19Rik/10:29101021-29101022-29097994-29097995-+/+ 9330159F19Rik protein_coding +/+ interior 10:29101021-29097994 3027.0 Mouse
9330159F19Rik/10:29101234-29101239-29101064-29101069-+/+ 9330159F19Rik protein_coding +/+ interior 10:29101234-29101064 170.0 Mouse
9330159F19Rik/10:29103493-29103494-29100430-29100431-+/+ 9330159F19Rik protein_coding +/+ interior 10:29103493-29100430 3063.0 Mouse
9330159F19Rik/10:29104331-29104336-29103868-29103873-+/+ 9330159F19Rik protein_coding +/+ interior 10:29104331-29103868 463.0 Mouse
9330162G02Rik/7:58874944-58874950-58875690-58875696--/- 9330162G02Rik TEC -/- interior 7:58874944-58875690 746.0 Mouse