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  • 1.
    Johnsson, Anna
    et al.
    Södertörn University, School of Life Sciences, Molecular biology. Karolinska Institutet.
    Xue-Franzen, Yongtao
    Södertörn University, School of Life Sciences, Molecular biology. Karolinska Intitutet.
    Lundin, Maria
    Södertörn University, School of Life Sciences, Molecular biology. Karolinska Institutet.
    Wright, Anthony P. H.
    Södertörn University, School of Life Sciences, Molecular biology. Karolinska Institutet.
    Stress-specific role of fission yeast Gcn5 histone acetyltransferase in programming a subset of stress response genes2006In: Eukaryotic Cell, ISSN 1535-9778, E-ISSN 1535-9786, Vol. 5, no 8, p. 1337-1346Article in journal (Refereed)
    Abstract [en]

    Gcn5 is a coactivator protein that contributes to gene activation by acetylating specific lysine residues within the N termini of histone proteins. Gcn5 has been intensively studied in the budding yeast, Saccharomyces cerevisiae, but the features of genes that determine whether they require Gcn5 during activation have not been conclusively clarified. To allow comparison with S. cerevisiae, we have studied the genome-wide role of Gcn5 in the distantly related fission yeast, Schizosaccharomyces pombe. We show that Gcn5 is specifically required for adaptation to KCl- and CaCl2-mediated stress in S. pombe. We have characterized the genome-wide gene expression responses to KCl stress and show that Gcn5 is involved in the regulation of a subset of stress response genes. Gcn5 is most clearly associated with KCl-induced genes, but there is no correlation between Gcn5 dependence and the extent of their induction. Instead, Gen5-dependent KCl-induced genes are specifically enriched in four different DNA motifs. The Gcn5-dependent KCl-induced genes are also associated with biological process gene ontology terms such as carbohydrate metabolism, glycolysis, and nicotinamide metabolism that together constitute a subset of the ontology parameters associated with KCl-induced genes.

  • 2. Syed, M.
    et al.
    Vestrheim, O.
    Mikkelsen, B.
    Lundin, Maria
    Södertörn University, Avdelning Naturvetenskap. Norwegian Sch. of Veterinary Science, Oslo, Norway .
    Isolation of the promoters of Atlantic salmon MHCII genes2003In: Marine Biotechnology, ISSN 1436-2228, E-ISSN 1436-2236, Vol. 5, no 3, p. 253-260Article in journal (Refereed)
    Abstract [en]

    The major histocompatibility complex class II (MHCII) has a central role in the immune response of vertebrates with its function of presenting antigenic peptides to the T-cell receptors. We have isolated the promoters and intron 1 of MHCIIα and MHCIIβ genes of Atlantic salmon. To isolate these promoters, we constructed an Atlantic salmon (Salmo salar) promoter finder kit (analogous to the commercially available "human promoter finder kit"). By nucleotide sequence alignment of known MHCII promoter regions, we identified the 3 conserved regulatory X, X2, and Y boxes in the salmon promoters. The W box was not found. In contrast, a salmon-specific putative W box was identified. Both of the isolated Atlantic salmon MHCIIα and β promoters (included in patent applications by Genomar A/S, Oslo, Norway) were found to be functional since they both gave positive yellow fluorescence protein signal when inserted as promoters in the pEYFP-1 reporter plasmid and transfected into the salmon head kidney cell line (SHK-1).

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