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Species: Human
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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
5_8S_rRNA/21:8256890-8256890-8256781-8256781-+/+ 5_8S_rRNA rRNA +/+ partial 21:8256890-8256781 109.0 Human
5_8S_rRNA/21:8256903-8256904-8256799-8256800-+/+ 5_8S_rRNA rRNA +/+ interior 21:8256903-8256799 104.0 Human
5_8S_rRNA/21:8256925-8256926-8256807-8256808-+/+ 5_8S_rRNA rRNA +/+ interior 21:8256925-8256807 118.0 Human
5_8S_rRNA/KI270733.1:174058-174058-173956-173956-+/+ 5_8S_rRNA rRNA +/+ partial KI270733.1:174058-173956 102.0 Human
5_8S_rRNA/KI270733.1:174102-174108-173984-173990-+/+ 5_8S_rRNA rRNA +/+ partial KI270733.1:174102-173984 118.0 Human
5_8S_rRNA::intergenic/21:8256856-8256857-8209967-8209968-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic 21:8256857-8209968 46889.0 Human
5_8S_rRNA::intergenic/21:8256857-8256857-8255097-8255097-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic 21:8256857-8255097 1760.0 Human
5_8S_rRNA::intergenic/21:8256858-8256860-8253980-8253982-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic 21:8256860-8253982 2878.0 Human
5_8S_rRNA::intergenic/21:8256859-8256859-8210909-8210909-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic 21:8256859-8210909 45950.0 Human
5_8S_rRNA::intergenic/21:8256859-8256859-8214637-8214637-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic 21:8256859-8214637 42222.0 Human