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Table 4 Distribution and modalities of trans-splicing among metazoans

From: Chætognath transcriptome reveals ancestral and unique features among bilaterians

Phylum: species Trans-splicing Percent trans-spliced genes Number of SL forms Operons Percent genes in operons References
Cnidaria: Hydra vulgaris + Very few* 2 ? NA [85]
Urochordata (tunicate): Ciona intestinalis + ~2%* 1 + ~2% [61]
Chætognatha: Spadella cephaloptera; Flaccisagitta enflata + ~55% 2* + ND This study
Acoela: Convoluta pulchra + >5% 1 ? ND This study
Rotifera: Adineta ricciae; Philodina sp. + ND 1 ND ND [37]
Platyhelminth: Schistosoma mansoni; seven more species + >3% 1-2 + ND [60,62]
Nematoda: Caenothabditis elegans + ~50% 2 + ~20% [58,59]
  1. *This figure was obtained by the analysis of a sample of several cDNA libraries sequenced from the 5' end. This figure was obtained from 3' end sequenced cDNA libraries and may be greatly underestimated. For a precise list of these species see [62]. NA, not applicable; ND, not determined.