# HISTORY 07 May 2016: Updated by: TOUCHUP-v1.18 15 Mar 2016: Updated by: TOUCHUP-v1.14 25 Mar 2016: Updated by: TOUCHUP-v1.15 # molecular_function # cellular_component 20150619: Eukaryota_PTN000319347 is found in U12-type spliceosomal complex (GO:0005689) 20150619: Eukaryota_PTN000319347 is found in precatalytic spliceosome (GO:0071011) 20150619: Eukaryota_PTN000319347 is found in catalytic step 2 spliceosome (GO:0071013) 20150619: Eukaryota_PTN000319347 is found in U2 snRNP (GO:0005686) 20150619: Chromadorea_PTN000992505 is NOT found in U12-type spliceosomal complex (GO:0005689) 20150619: Alveolata_PTN000319401 is NOT found in U12-type spliceosomal complex (GO:0005689) 20150619: Ascomycota_PTN000319389 is NOT found in U12-type spliceosomal complex (GO:0005689) 20150619: Excavarus_PTN000992541 is NOT found in U12-type spliceosomal complex (GO:0005689) # biological_process 20150813: Eukaryota_PTN000319347 participates in mRNA splicing, via spliceosome (GO:0000398) # WARNINGS - THE FOLLOWING HAVE BEEN REMOVED FOR THE REASONS NOTED # NOTES This family contains the S. cerevisiae subunit of the Sf3b subcomplex of the U2 snRNP. In organisms, which contain the minor U12-type spliceosome as well as the major U2-type spliceosome, this subcomplex is part of the U12 snRNP (Will et al. 2004, PMID:15146077; Turunen et al. 2013, PMID:23074130) as well as being part of the U2 snRNP (Turunen et al. 2013, PMID:23074130). It is believed that the last eukaryotic common ancestor (LECA) possessed both the major (U2-type) and minor (U12-type) spliceosomes and that the current diversity of organisms across multiple taxonomic groups which lack the minor U12-type has been generated by multiple loss events of the minor U12-type spliceosome (Irimia and Roy 2014, PMID:24890509; Lopez et al. 2008, PMID:18390578, Turunen et al. 2013, PMID:23074130). Note: There may be some issues regarding the usage of "SF3B14" name. The MGI page for SF3B6 gives Sf3b14 as an alias for SF3B6, and in PTHR12785, the SF3B6 subclade contains some sequences labeled as SF3B14 (e.g. Bos taurus SF3B14, Pan troglodytes H2QHI7, Macaca mulatta F7BUD8, and Gallus gallus E1BW94. However, Wang et al. 2005 (PMID:16314500) list S. cerevisiae RDS3 as the equivalent of SFB14B. ScRDS3 is present in PTHR13120 and the MSA there looks great, the majority of the vertebrate gene names are PHF5, with W4ZIF2 from Strongylocentrotus purpuratus (Purple sea urchin) being one of the few sequences I see labeled with the "Sf3b14b" name. It is believed that the last eukaryotic common ancestor (LECA) possessed both the major (U2-type) and minor (U12-type) spliceosomes and that the current diversity of organisms across multiple taxonomic groups which lack the minor U12-type has been generated by multiple loss events of the minor U12-type spliceosome (Lopez et al. 2008, PMID:18390578; Bartschat & Samuelsson 2010, PMID:20149226; Turunen et al. 2013, PMID:23074130; Irimia and Roy 2014, PMID:24890509). Comment on annotation propagations: ------------------------------- Based on the current views on the phylogeny of the major U2-type and minor U12-type spliceosomes, I have propagated both the U2-type and the U12-type terms to the root node of the tree Then, I have blocked propagation of the U12-type terms in multiple places based on the phylogenetic analysis in Bartschat & Samuelsson 2010 (PMID:20149226) and Turunen et al. 2013 (PMID:23074130) and the computational work of Lopez et al. 2008 (PMID:18390578) to determine the phylogenetic distribution of the major and minor spliceosomes. - In some places, I have felt confident that I could place the block at the node representing an entire taxonomic group, e.g. Ascomycetes, Chromodorea (a group within Nemotoda), Alveolata (includes Plasmodium & Tetrahymena), Excavarus (includes Trichomonas, Trypanosoma, and Leishmania). - In other places, such as the Basidiomycetes where there are members of this taxonomic group thought to still contain the minor U12-type, I have placed the block on the individual species currently represented in the tree if they are thought to have lost it. - I have also blocked the U12-type terms in several individual species that appear to be the sole representative of their group included in the Panther Tree, e.g. Chlamydomonas reinhardtii (green algae), Entamoeba histolytica, and Thalassiosira pseudonana. # REFERENCE Annotation inferences using phylogenetic trees The goal of the GO Reference Genome Project, described in PMID 19578431, is to provide accurate, complete and consistent GO annotations for all genes in twelve model organism genomes. To this end, GO curators are annotating evolutionary trees from the PANTHER database with GO terms describing molecular function, biological process and cellular component. GO terms based on experimental data from the scientific literature are used to annotate ancestral genes in the phylogenetic tree by sequence similarity (ISS), and unannotated descendants of these ancestral genes are inferred to have inherited these same GO annotations by descent. The annotations are done using a tool called PAINT (Phylogenetic Annotation and INference Tool).