title: The fission yeast spSet1p is a histone H3-K4 methyltransferase that functions in telomere maintenance and DNA repair in an ATM kinase Rad3-dependent pathway.
abstract: We have characterized spSet1p, the Schizosaccharomyces pombe ortholog of the budding yeast histone H3 methyltransferase Set1p. SpSet1p catalyzes methylation of H3 at K4, in vivo and in vitro. Deleting spset1 partially affects telomeric and centromeric silencing. Strikingly, lack of spSet1p causes elongation of telomeres in wild-type cells and in most DNA damage checkpoint rad mutant cells, but not in cells lacking the ATM kinase Rad3 or its associated protein Rad26. Interestingly, spset1 deletion specifically causes a reduction in sensitivity to ultraviolet radiation of the PCNA-like checkpoint mutants hus1 and rad1, but not of cells devoid of Rad3. This partial suppression was not due to restoration of checkpoint function or to transcriptional induction of DNA repair genes. Moreover, spset1 allows recovery specifically of the crb2 checkpoint mutant upon treatment with the replication inhibitor hydroxyurea but not upon UV irradiation. Nevertheless, the pathway induced in spset1 cells cannot substitute for the Mus81/Rqh1 DNA damage tolerance pathway. Our results suggest that SpSet1p and the ATM kinase Rad3 function in a common genetic pathway linking chromatin to telomere length regulation and DNA repair.
authors.affiliation: Graduate School of Biostudies, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Junko
authors.initials: J
authors.lastname: Kanoh
authors.forename: Stefania
authors.initials: S
authors.lastname: Francesconi
authors.forename: Ada
authors.initials: A
authors.lastname: Collura
authors.forename: Vera
authors.initials: V
authors.lastname: Schramke
authors.forename: Fuyuki
authors.initials: F
authors.lastname: Ishikawa
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Baldacci
authors.forename: Vincent
authors.initials: V
authors.lastname: Géli
mesh_terms: D000970:Antineoplastic Agents / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002470:Cell Survival; D002503:Centromere / Q000378:metabolism; D064447:Checkpoint Kinase 2; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020868:Gene Silencing / Q000502:physiology; D018816:Genes, cdc; D011495:Histone-Lysine N-Methyltransferase; D006657:Histones / Q000378:metabolism; D006801:Humans; D006918:Hydroxyurea / Q000378:metabolism; D008745:Methylation; D008780:Methyltransferases / Q000235:genetics / Q000378:metabolism*; D011494:Protein Kinases / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D012568:Schizosaccharomyces / Q000201:enzymology; D029702:Schizosaccharomyces pombe Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016615:Telomere / Q000378:metabolism*; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D000970:Antineoplastic Agents; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D006657:Histones; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D014157:Transcription Factors; C106332:hus1 protein, S pombe; D008780:Methyltransferases; D011495:Histone-Lysine N-Methyltransferase; C411250:SET1 protein, S cerevisiae; C472830:Set1 protein, S pombe; D011494:Protein Kinases; D064447:Checkpoint Kinase 2; C456840:rad3 protein, S pombe; D006918:Hydroxyurea