description
The splicing of a subset of pre-mRNA introns occurs by a second pathway, designated the AT-AC or U12-dependent splicing pathway. AT-AC introns have highly conserved, non-canonical splice sites that are removed by the AT-AC spliceosome, which contains distinct snRNAs (U11, U12, U4atac, U6atac) that are structurally and functionally analogous to the major spliceosome. U5 snRNA as well as many of the protein factors appear to be conserved between the two spliceosomes

external resources
NCBI:1269691
REACTOME:R-HSA-72165
PUBMED:10207048
PUBMED:9149533

genes
GTF2F1 , GTF2F2 , NCBP1 , SNU13 , YBX1 , POLR2A , POLR2B , POLR2C , POLR2D , POLR2E , POLR2F , POLR2G , POLR2H , POLR2I , POLR2J , POLR2K , POLR2L , SRSF1 , SRSF2 , SRSF6 , SRSF7 , SNRPB , SNRPD1 , SNRPD2 , SNRPD3 , SNRPE , SNRPF , SNRPG , ZRSR2 , EFTUD2 , SNRNP40 , DDX23 , PDCD7 , SF3B4 , PRPF8 , TXNL4A , SF3B2 , SNRNP35 , DDX42 , NCBP2 , SNRNP200 , SF3B3 , SF3B1 , PRPF6 , SF3B6 , RNPC3 , ZMAT5 , LSM2 , SNRNP25 , SF3B5 , ZCRB1 , SNRNP48 , MIR636 ,