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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::intergenic/KI270733.1:174038-174039-130402-130403-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174039-130403 43636.0 Human
5_8S_rRNA::intergenic/KI270733.1:174038-174039-171147-171148-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174039-171148 2891.0 Human
5_8S_rRNA::intergenic/KI270733.1:174043-174044-126263-126264-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174044-126264 47780.0 Human
5_8S_rRNA::intergenic/KI270733.1:174045-174045-171265-171265-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174045-171265 2780.0 Human
5_8S_rRNA::intergenic/KI270733.1:174050-174051-129036-129037-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174051-129037 45014.0 Human
5_8S_rRNA::intergenic/KI270733.1:174052-174053-125941-125942-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174053-125942 48111.0 Human
5_8S_rRNA::intergenic/KI270733.1:174060-174061-127134-127135-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174061-127135 46926.0 Human
5_8S_rRNA::intergenic/KI270733.1:174078-174078-176499-176499--/+ 5_8S_rRNA::intergenic rRNA -/+ intergenic KI270733.1:174078-176499 2421.0 Human
5_8S_rRNA::intergenic/KI270733.1:174106-174109-129271-129274-+/+ 5_8S_rRNA::intergenic rRNA +/+ intergenic KI270733.1:174109-129274 44835.0 Human
7SK/6:52995745-52995751-52995637-52995643-+/+ 7SK misc_RNA +/+ interior 6:52995751-52995643 108.0 Human