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Tissue: A549
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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
ABCD4/14:74286388-74286390-74286497-74286499--/- ABCD4 protein_coding -/- interior 14:74286388-74286497 109.0 Human
ABCE1/4:145128611-145128611-145128372-145128372-+/+ ABCE1 protein_coding +/+ interior 4:145128611-145128372 239.0 Human
ABCE1/4:145128769-145128774-145128562-145128567-+/+ ABCE1 protein_coding +/+ interior 4:145128769-145128562 207.0 Human
ABCE1/4:145128778-145128786-145128667-145128675-+/+ ABCE1 protein_coding +/+ interior 4:145128778-145128667 111.0 Human
ABCF1/6:30591201-30591207-30591088-30591094-+/+ ABCF1 protein_coding +/+ interior 6:30591201-30591088 113.0 Human
ABCF2-H2BK1/7:151213808-151213809-151213926-151213927--/- ABCF2-H2BK1 protein_coding -/- interior 7:151213808-151213926 118.0 Human
ABCF2-H2BK1/7:151213981-151213981-151214153-151214153--/- ABCF2-H2BK1 protein_coding -/- interior 7:151213981-151214153 172.0 Human
ABHD12/20:25300283-25300284-25300434-25300435--/- ABHD12 protein_coding -/- interior 20:25300283-25300434 151.0 Human
ABHD12/20:25300429-25300432-25300645-25300648--/- ABHD12 protein_coding -/- partial 20:25300432-25300648 216.0 Human
ABHD12/20:25300435-25300438-25300651-25300654--/- ABHD12 protein_coding -/- interior 20:25300435-25300651 216.0 Human