title: Targeted disruption of IRF-1 or IRF-2 results in abnormal type I IFN gene induction and aberrant lymphocyte development.
abstract: Interferon regulatory factor 1 (IRF-1), a transcriptional activator, and its antagonistic repressor, IRF-2, were originally identified as regulators of the type I interferon (IFN) system. We have generated mice deficient in either IRF-1 or IRF-2 by gene targeting in embryonic stem cells. IRF-1-deficient fibroblasts lacked the normally observed type I IFN induction by poly(I):poly(C), while they induced type I IFN to similar levels as the wild type following Newcastle disease virus (NDV) infection. In contrast, IRF-2-deficient fibroblasts showed up-regulated type I IFN induction by NDV infection. A profound reduction of TCR alpha beta+CD4-CD8+ T cells in IRF-1-deficient mice, with a thymocyte developmental defect, reveals a critical role for IRF-1 in T cell development. IRF-2-deficient mice exhibited bone marrow suppression of hematopoiesis and B lymphopoiesis and mortality following lymphocytic choriomeningitis virus infection.
authors.affiliation: Amgen Institute, University of Toronto, Ontario, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Matsuyama
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Kitagawa
authors.forename: K
authors.initials: K
authors.lastname: Pfeffer
authors.forename: T
authors.initials: T
authors.lastname: Kawakami
authors.forename: N
authors.initials: N
authors.lastname: Watanabe
authors.forename: T M
authors.initials: TM
authors.lastname: Kündig
authors.forename: R
authors.initials: R
authors.lastname: Amakawa
authors.forename: K
authors.initials: K
authors.lastname: Kishihara
authors.forename: A
authors.initials: A
authors.lastname: Wakeham
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D001483:Base Sequence; D001853:Bone Marrow / Q000276:immunology / Q000502:physiology; D002678:Chimera; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics*; D004622:Embryo, Mammalian; D015870:Gene Expression; D005786:Gene Expression Regulation; D006410:Hematopoiesis / Q000502:physiology; D050856:Interferon Regulatory Factor-1; D050836:Interferon Regulatory Factor-2; D007370:Interferon Type I / Q000096:biosynthesis / Q000235:genetics*; D008214:Lymphocytes / Q000276:immunology / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008969:Molecular Sequence Data; D005810:Multigene Family; D009522:Newcastle disease virus / Q000276:immunology; D010750:Phosphoproteins / Q000096:biosynthesis / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000096:biosynthesis; D012097:Repressor Proteins; D013234:Stem Cells / Q000502:physiology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics*; D015533:Transcriptional Activation; D014721:Vesicular stomatitis Indiana virus / Q000276:immunology
chemical_list: D017931:DNA Primers; D004268:DNA-Binding Proteins; D050856:Interferon Regulatory Factor-1; D050836:Interferon Regulatory Factor-2; D007370:Interferon Type I; C494258:Irf1 protein, mouse; C494230:Irf2 protein, mouse; D010750:Phosphoproteins; D012333:RNA, Messenger; D012097:Repressor Proteins; D014157:Transcription Factors