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    THOC5/FMIP, an mRNA export TREX complex protein, is essential for hematopoietic primitive cell survival in vivo.

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    Authors
    Mancini, Annalisa
    Niemann-Seyde, Susanne C
    Pankow, Rüdiger
    El Bounkari, Omar
    Klebba-Faerber, Sabine
    Koch, Alexandra
    Jaworska, Ewa
    Spooncer, Elaine
    Gruber, Achim D
    Whetton, Anthony D
    Tamura, Teruko
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    Affiliation
    Institut fuer Biochemie, OE4310, Medizinische Hochschule Hannover, Carl-Neuberg-Str, 1, D-30623 Hannover, Germany. annalisa_mancini@hotmail.de
    Issue Date
    2010
    
    Metadata
    Show full item record
    Abstract
    BACKGROUND: The transcription/export complex is evolutionarily conserved from yeast to man and is required for coupled transcription elongation and nuclear export of mRNAs. FMIP(Fms interacting protein) is a member of the THO (suppressors of the transcriptional defects of hpr1delta by overexpression) complex which is a subcomplex of the transcription/export complex. THO complex (THOC) components are not essential for bulk poly (A)+ RNA export in higher eukaryotes, but for the nuclear export of subset of mRNAs, however, their exact role is still unclear. RESULTS: To study the role of THOC5/Fms interacting protein in vivo, we generated THOC5/Fms interacting protein knockout mice. Since these mice are embryonic lethal, we then generated interferon inducible conditional THOC5/Fms interacting protein knockout mice. After three poly injections all of the mice died within 14 days. No pathological alterations, however, were observed in liver, kidney or heart. Thus we considered the hematopoietic system and found that seven days after poly injection, the number of blood cells in peripheral blood decreased drastically. Investigation of bone marrow cells showed that these became apoptotic within seven days after poly injection. Committed myeloid progenitor cells and cells with long term reconstituting potential were lost from bone marrow within four days after poly injection. Furthermore, infusion of normal bone marrow cells rescued mice from death induced by loss of THOC5/Fms interacting protein. CONCLUSION: THOC5/Fms interacting protein is an essential element in the maintenance of hematopoiesis. Furthermore, mechanistically depletion of THOC5/Fms interacting protein causes the down-regulation of its direct interacting partner, THOC1 which may contribute to altered THO complex function and cell death.
    Citation
    THOC5/FMIP, an mRNA export TREX complex protein, is essential for hematopoietic primitive cell survival in vivo. 2010, 8:1 BMC Biol.
    Journal
    BMC Biology
    URI
    http://hdl.handle.net/10541/109347
    DOI
    10.1186/1741-7007-8-1
    PubMed ID
    20051105
    Type
    Article
    Language
    en
    ISSN
    1741-7007
    ae974a485f413a2113503eed53cd6c53
    10.1186/1741-7007-8-1
    Scopus Count
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    All Paterson Institute for Cancer Research

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