et al., 2008|biblio/19030770]], [[Denoeud et al., 2010|biblio/21097902]]).
It is found in _Ciona_ but not in _C. elegans_ ()[[Martz et al.,
2008|biblio/19030770]]. The major spliceosome is hypothethised to have evolved
- to become more permissive in order to splice G*-AG sites ([[Denoeud et al., 2010|biblio/21097902]]).
+ to become more permissive in order to splice G*-AG sites. ”A large fraction
+ (more than 10%) of the (...) introns displayed non-canonical (non GT-AG)
+ splice sites, whereas the usual proportion is around 1%-1.5% in other genomes”
+ ([[Denoeud et al., 2010|biblio/21097902]]).
- Operons are enriched for houskeeping genes and depleted for developmental genes
([[Denoeud et al., 2010|biblio/21097902]]).
+ - “LTR retrotransposons account for a significant part of the indel polymorphism in the Oikopleura genome.”
+ “Tor-3G elements are frequently inserted into exons and can be transcribed
+ together with their host gene, although transcripts initiated in the LTR
+ are also detected (Figure S11).”
+ “The low allelic frequency of Tor-3G insertions is correlated with the
+ almost exclusive occurrence of heterozygous genotypes in the populations.
+ Moreover, experimental crosses between selected heterozygous parents for
+ the same insertion have thus far not resulted in homozygous offsprings.”
+ ([[Denoeud et al., 2010|biblio/21097902]]).
+ - ”Highly conserved elements (HCEs) lie around these developmental genes.”
+ “Spots of sequence ultraconservation are almost systematically located
+ in non coding regions, including introns that are larger than average
+ in such genes than in others.” ([[Denoeud et al., 2010|biblio/21097902]]).
Transcriptome