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Table 1 Intron gains identified with a purportedly known mechanistic origin

From: Identifying the mechanisms of intron gain: progress and trends

Proposed mechanism

In vivodemonstration

Indirect evidence

Number of events unambiguously identified

Specie(s) event identified in

Intron Transposition

No

Yes [25, 44]

14

Mycosphaerella, Oikopleura

Transposon Insertion

No

Yes [23, 25, 54, 55]

35

Oryza, Drosophila, Oikopleura, Zea

Tandem Genomic Duplication

Yes [56]

Yes [18, 57]

188

Arabidopsis, Oryza, Caenorhabditis, Drosophila, mouse, human, Cryptococcus

Intron Gain during DSBR

No

Yes [22, 23, 27, 58, 59]

5

Drosophila, Daphnia, Aspergillus, Bigelowiella, human

Intron Transfer

No

Yes [22, 31, 44]

3

Mycosphaerella, Aspergillus, Chironomus,

Insertion of a Group II Intron

Likely does not occur [60]

No

0

 

Intronization

No

Yes [41, 42, 61, 62]

29

Cryptococcus, Caenorhabditis

  1. Only intron gains with novel splice sites (i.e. not simple duplications of pre-existing introns) were included. Only novel introns with EST support were selected from [57]. For a more detailed treatment of events, see the MIGL database located at http://cpath.him.pitt.edu/intron/index.php (manuscript in preparation).