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Table 2 Annotation of abundant introns based on presence of known small RNAs

From: Intronic RNAs constitute the major fraction of the non-coding RNA in mammalian cells

 

Maximum intron/Exon density

 

>10 fold

2-10 fold

1-2 fold

1 fold and above

Total introns*

96

707

4,950

5,753

UCSC snoRNAs

34

19

23

76

Ensemble snoRNAs

48

31

17

96

Non-mouse snoRNAs

1

0

0

1

Ensemble snRNAs

2

7

8

17

RNA repeats

3

14

52

69

Un-annotated

8

636

4,850

5,494

Un-annotated %

8.3%

90.0%

98.0%

95.5%

  1. *Introns overlapping an annotation were removed from the subsequent analysis. For example, introns overlapping UCSC snoRNAs were not to be used for comparison with Ensembl snoRNAs and so on.