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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).