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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
6330403K07Rik/11:70923740-70923746-70924135-70924141--/- 6330403K07Rik protein_coding -/- interior 11:70923746-70924141 395.0 Mouse
6330403K07Rik/11:70923753-70923757-70923900-70923904--/- 6330403K07Rik protein_coding -/- interior 11:70923757-70923904 147.0 Mouse
6330403K07Rik/11:70923798-70923801-70924120-70924123--/- 6330403K07Rik protein_coding -/- interior 11:70923801-70924123 322.0 Mouse
6330403K07Rik/11:70923807-70923813-70924115-70924121--/- 6330403K07Rik protein_coding -/- interior 11:70923813-70924121 308.0 Mouse
6330403K07Rik/11:70923812-70923818-70924115-70924121--/- 6330403K07Rik protein_coding -/- interior 11:70923818-70924121 303.0 Mouse
6330403K07Rik::intergenic/11:70923495-70923500-70924370-70924375--/- 6330403K07Rik::intergenic protein_coding -/- intergenic 11:70923495-70924370 875.0 Mouse
6430548M08Rik/8:120878120-120878121-120872204-120872205-+/+ 6430548M08Rik protein_coding +/+ partial 8:120878121-120872205 5916.0 Mouse
6430548M08Rik/8:120889164-120889169-120888757-120888762-+/+ 6430548M08Rik protein_coding +/+ interior 8:120889169-120888762 407.0 Mouse
6820431F20Rik/8:20171942-20171943-20171818-20171819-+/+ 6820431F20Rik lncRNA +/+ interior 8:20171943-20171819 124.0 Mouse
9130024F11Rik/1:57012831-57012832-57012125-57012126-+/+ 9130024F11Rik lncRNA +/+ interior 1:57012831-57012125 706.0 Mouse