Little is known about pre-mRNA splicing in Dictyostelium discoideum although its genome has been completely sequenced.Our analysis suggests that pre-mRNA splicing plays an important role in D.discoideum gene expressio...Little is known about pre-mRNA splicing in Dictyostelium discoideum although its genome has been completely sequenced.Our analysis suggests that pre-mRNA splicing plays an important role in D.discoideum gene expression as two thirds of its genes contain at least one intron.Ongoing curation of the genome to date has revealed 40 genes in D.discoideum with clear evidence of alternative splicing,supporting the existence of alternative splicing in this unicellular organism.We identified 160 candidate U2-type spliceosomal proteins and related factors in D.discoideum based on 264 known human genes involved in splicing.Spliceosomal small ribonucleoproteins(snRNPs),PRP19 complex proteins and late-acting proteins are highly conserved in D.discoideum and throughout the metazoa.In non-snRNP and hnRNP families,D.discoideum orthologs are closer to those in A.thaliana,D.melanogaster and H.sapiens than to their counterparts in S.cerevisiae.Several splicing regulators,including SR proteins and CUGbinding proteins,were found in D.discoideum,but not in yeast.Our comprehensive catalog of spliceosomal proteins provides useful information for future studies of splicing in D.discoideum where the efficient genetic and biochemical manipulation will also further our general understanding of pre-mRNA splicing.展开更多
基金supported by grants to J.Y.W from NIH(EY014576 and GM070967)A.F.from NSF Career award MCB-0643542 and to R.L.C.from NIH(GM64426 and HG02273).
文摘Little is known about pre-mRNA splicing in Dictyostelium discoideum although its genome has been completely sequenced.Our analysis suggests that pre-mRNA splicing plays an important role in D.discoideum gene expression as two thirds of its genes contain at least one intron.Ongoing curation of the genome to date has revealed 40 genes in D.discoideum with clear evidence of alternative splicing,supporting the existence of alternative splicing in this unicellular organism.We identified 160 candidate U2-type spliceosomal proteins and related factors in D.discoideum based on 264 known human genes involved in splicing.Spliceosomal small ribonucleoproteins(snRNPs),PRP19 complex proteins and late-acting proteins are highly conserved in D.discoideum and throughout the metazoa.In non-snRNP and hnRNP families,D.discoideum orthologs are closer to those in A.thaliana,D.melanogaster and H.sapiens than to their counterparts in S.cerevisiae.Several splicing regulators,including SR proteins and CUGbinding proteins,were found in D.discoideum,but not in yeast.Our comprehensive catalog of spliceosomal proteins provides useful information for future studies of splicing in D.discoideum where the efficient genetic and biochemical manipulation will also further our general understanding of pre-mRNA splicing.
