title: Characterization and in vivo functional analysis of the Schizosaccharomyces pombe ICLN gene.
abstract: During the early steps of snRNP biogenesis, the survival motor neuron (SMN) complex acts together with the methylosome, an entity formed by the pICln protein, WD45, and the PRMT5 methyltransferase. To expand our understanding of the functional relationship between pICln and SMN in vivo, we performed a genetic analysis of an uncharacterized Schizosaccharomyces pombe pICln homolog. Although not essential, the S. pombe ICln (SpICln) protein is important for optimal yeast cell growth. The human ICLN gene complements the Δicln slow-growth phenotype, demonstrating that the identified SpICln sequence is the bona fide human homolog. Consistent with the role of human pICln inferred from in vitro experiments, we found that the SpICln protein is required for optimal production of the spliceosomal snRNPs and for efficient splicing in vivo. Genetic interaction approaches further demonstrate that modulation of ICln activity is unable to compensate for growth defects of SMN-deficient cells. Using a genome-wide approach and reverse transcription (RT)-PCR validation tests, we also show that splicing is differentially altered in Δicln cells. Our data are consistent with the notion that splice site selection and spliceosome kinetics are highly dependent on the concentration of core spliceosomal components.
authors.affiliation: Institut de Génétique Moléculaire de Montpellier, CNRS-UMR5535, Université Montpellier 1 and 2, Montpellier, France.
authors.forename: Adrien
authors.initials: A
authors.lastname: Barbarossa
authors.forename: Etienne
authors.initials: E
authors.lastname: Antoine
authors.forename: Henry
authors.initials: H
authors.lastname: Neel
authors.forename: Thierry
authors.initials: T
authors.lastname: Gostan
authors.forename: Johann
authors.initials: J
authors.lastname: Soret
authors.forename: Rémy
authors.initials: R
authors.lastname: Bordonné
mesh_terms: D003593:Cytoplasm / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007473:Ion Channels / Q000235:genetics* / Q000378:metabolism; D008780:Methyltransferases / Q000235:genetics / Q000378:metabolism; D009046:Motor Neurons / Q000378:metabolism*; D011485:Protein Binding / Q000235:genetics; D011496:Protein Methyltransferases / Q000235:genetics / Q000378:metabolism; D012326:RNA Splicing / Q000235:genetics*; D012568:Schizosaccharomyces / Q000235:genetics* / Q000378:metabolism; D017381:Spliceosomes / Q000235:genetics* / Q000378:metabolism
chemical_list: C410035:CLNS1A protein, human; D007473:Ion Channels; D008780:Methyltransferases; D011496:Protein Methyltransferases