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  • Mutation  (4)
  • 2000-2004  (4)
  • 1
    Publikationsdatum: 2000-02-26
    Beschreibung: The Gram-negative bacterium Helicobacter pylori is a causative agent of gastritis and peptic ulcer disease in humans. Strains producing the CagA antigen (cagA(+)) induce strong gastric inflammation and are strongly associated with gastric adenocarcinoma and MALT lymphoma. We show here that such strains translocate the bacterial protein CagA into gastric epithelial cells by a type IV secretion system, encoded by the cag pathogenicity island. CagA is tyrosine-phosphorylated and induces changes in the tyrosine phosphorylation state of distinct cellular proteins. Modulation of host cells by bacterial protein translocation adds a new dimension to the chronic Helicobacter infection with yet unknown consequences.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Odenbreit, S -- Puls, J -- Sedlmaier, B -- Gerland, E -- Fischer, W -- Haas, R -- New York, N.Y. -- Science. 2000 Feb 25;287(5457):1497-500.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max von Pettenkofer Institute for Hygiene and Medical Microbiology, Ludwig-Maximilians University Munich, D-80336 Munich, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10688800" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Motifs ; *Antigens, Bacterial ; Bacterial Proteins/genetics/*metabolism ; Biological Transport ; Enzyme Inhibitors/pharmacology ; Epithelial Cells/metabolism/microbiology ; Fluorescent Antibody Technique ; Gastric Mucosa/*metabolism/*microbiology ; Genes, Bacterial ; Genetic Complementation Test ; Genistein/pharmacology ; Helicobacter pylori/genetics/*metabolism/pathogenicity ; Humans ; Mutation ; Phosphorylation ; Phosphotyrosine/metabolism ; Protein-Tyrosine Kinases/antagonists & inhibitors/metabolism ; Staurosporine/pharmacology ; Tumor Cells, Cultured ; Virulence
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2000-04-28
    Beschreibung: Severe combined immunodeficiency-X1 (SCID-X1) is an X-linked inherited disorder characterized by an early block in T and natural killer (NK) lymphocyte differentiation. This block is caused by mutations of the gene encoding the gammac cytokine receptor subunit of interleukin-2, -4, -7, -9, and -15 receptors, which participates in the delivery of growth, survival, and differentiation signals to early lymphoid progenitors. After preclinical studies, a gene therapy trial for SCID-X1 was initiated, based on the use of complementary DNA containing a defective gammac Moloney retrovirus-derived vector and ex vivo infection of CD34+ cells. After a 10-month follow-up period, gammac transgene-expressing T and NK cells were detected in two patients. T, B, and NK cell counts and function, including antigen-specific responses, were comparable to those of age-matched controls. Thus, gene therapy was able to provide full correction of disease phenotype and, hence, clinical benefit.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cavazzana-Calvo, M -- Hacein-Bey, S -- de Saint Basile, G -- Gross, F -- Yvon, E -- Nusbaum, P -- Selz, F -- Hue, C -- Certain, S -- Casanova, J L -- Bousso, P -- Deist, F L -- Fischer, A -- New York, N.Y. -- Science. 2000 Apr 28;288(5466):669-72.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INSERM Unit 429, Gene Therapy Laboratory, Cell Therapy Laboratory, Unite d'Immunologie et d'Hematologie Pediatriques, Hopital Necker, 75743 Paris Cedex 15, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10784449" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Antigens, CD34/analysis ; B-Lymphocytes/immunology ; Gene Transfer Techniques ; *Genetic Therapy ; Genetic Vectors ; Hematopoietic Stem Cell Transplantation ; *Hematopoietic Stem Cells/cytology ; Humans ; Immunoglobulins/blood ; Infant ; Killer Cells, Natural/immunology ; Lymphocyte Activation ; Lymphocyte Count ; Moloney murine leukemia virus/genetics ; Mutation ; Receptors, Antigen, T-Cell/analysis ; Receptors, Interleukin/biosynthesis/*genetics ; Severe Combined Immunodeficiency/genetics/*therapy ; T-Lymphocyte Subsets/immunology ; T-Lymphocytes/immunology ; Transgenes
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2000-04-28
    Beschreibung: Memories are thought to be due to lasting synaptic modifications in the brain. The search for memory traces has relied predominantly on determining regions that are necessary for the process. However, a more informative approach is to define the smallest sufficient set of brain structures. The rutabaga adenylyl cyclase, an enzyme that is ubiquitously expressed in the Drosophila brain and that mediates synaptic plasticity, is needed exclusively in the Kenyon cells of the mushroom bodies for a component of olfactory short-term memory. This demonstrates that synaptic plasticity in a small brain region can be sufficient for memory formation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zars, T -- Fischer, M -- Schulz, R -- Heisenberg, M -- New York, N.Y. -- Science. 2000 Apr 28;288(5466):672-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Theodor Boveri Institut fur Biowissenschaften, Lehrstuhl fur Genetik, (Biozentrum) Am Hubland, D97074, Wurzburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10784450" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenylyl Cyclases/genetics/*metabolism ; Animals ; Avoidance Learning ; Brain/enzymology/physiology ; Brain Mapping ; DNA-Binding Proteins ; Drosophila/enzymology/genetics/*physiology ; Electroshock ; Enhancer Elements, Genetic ; Fungal Proteins/genetics ; *Memory, Short-Term ; Mutation ; *Neuronal Plasticity ; Neurons/enzymology/*physiology ; Olfactory Pathways ; *Saccharomyces cerevisiae Proteins ; Smell ; Synapses/*physiology ; Transcription Factors/genetics ; Transgenes
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2003-11-25
    Beschreibung: The Arabidopsis FWA gene was initially identified from late-flowering epigenetic mutants that show ectopic FWA expression associated with heritable hypomethylation of repeats around transcription starting sites. Here, we show that wild-type FWA displays imprinted (maternal origin-specific) expression in endosperm. The FWA imprint depends on the maintenance DNA methyltransferase MET1, as is the case in mammals. Unlike mammals, however, the FWA imprint is not established by allele-specific de novo methylation. It is established by maternal gametophyte-specific gene activation, which depends on a DNA glycosylase gene, DEMETER. Because endosperm does not contribute to the next generation, the activated FWA gene need not be silenced again. Double fertilization enables plants to use such "one-way" control of imprinting and DNA methylation in endosperm.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kinoshita, Tetsu -- Miura, Asuka -- Choi, Yeonhee -- Kinoshita, Yuki -- Cao, Xiaofeng -- Jacobsen, Steven E -- Fischer, Robert L -- Kakutani, Tetsuji -- GM60398/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2004 Jan 23;303(5657):521-3. Epub 2003 Nov 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Integrated Genetics, National Institute of Genetics, Mishima 411-8540, Japan. tekinosh@lab.nig.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14631047" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alleles ; Arabidopsis/*genetics/growth & development/metabolism ; Arabidopsis Proteins/*genetics/metabolism ; DNA (Cytosine-5-)-Methyltransferase/metabolism ; *DNA Methylation ; DNA, Plant/genetics/metabolism ; DNA-Cytosine Methylases/genetics/metabolism ; *Gene Expression Regulation, Plant ; Gene Silencing ; *Genomic Imprinting ; Homeodomain Proteins/*genetics/metabolism ; Methyltransferases/genetics/metabolism ; Mutation ; N-Glycosyl Hydrolases/genetics/metabolism ; Pollen ; Recombinant Fusion Proteins/metabolism ; Repetitive Sequences, Nucleic Acid ; Reverse Transcriptase Polymerase Chain Reaction ; Seeds/*genetics/metabolism ; Trans-Activators/genetics/metabolism ; Transcription Factors/*genetics/metabolism ; Transcription, Genetic ; Transcriptional Activation ; Transgenes
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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