Abstract
XRCC4 was identified via a complementation cloning method that employed an ionizing radiation (IR)-sensitive hamster cell line. By gene-targeted mutation, we show that XRCC4 deficiency in primary murine cells causes growth defects, premature senescence, IR sensitivity, and inability to support V(D)J recombination. In mice, XRCC4 deficiency causes late embryonic lethality accompanied by defective lymphogenesis and defective neurogenesis manifested by extensive apoptotic death of newly generated postmitotic neuronal cells. We find similar neuronal developmental defects in embryos that lack DNA ligase IV, an XRCC4-associated protein. Our findings demonstrate that differentiating lymphocytes and neurons strictly require the XRCC4 and DNA ligase IV end-joining proteins and point to the general stage of neuronal development in which these proteins are necessary.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Antigens, Nuclear*
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Apoptosis
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Body Patterning
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Cell Cycle
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Cell Differentiation
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Cell Line
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Central Nervous System / cytology
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Central Nervous System / embryology*
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DNA Helicases*
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DNA Ligase ATP
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DNA Ligases / genetics
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DNA Ligases / metabolism
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DNA Repair / radiation effects
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism*
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Embryonic and Fetal Development
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Fibroblasts
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Gene Rearrangement
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Genes, Essential
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Ku Autoantigen
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Lymphocyte Subsets / cytology*
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Lymphocyte Subsets / immunology
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Mice
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Mice, Knockout
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Neurons / cytology*
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Neurons / metabolism
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Nuclear Proteins / genetics
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Nuclear Proteins / metabolism
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Radiation, Ionizing
Substances
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Antigens, Nuclear
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DNA-Binding Proteins
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LIG4 protein, human
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Nuclear Proteins
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XRCC4 protein, human
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DNA Helicases
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XRCC5 protein, human
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Xrcc6 protein, human
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Xrcc6 protein, mouse
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Ku Autoantigen
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DNA Ligases
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DNA Ligase ATP