YY1 Controls Immunoglobulin Class Switch Recombination and Nuclear Activation-Induced Deaminase Levels
نویسندگان
چکیده
منابع مشابه
Ikaros controls isotype selection during immunoglobulin class switch recombination
Class switch recombination (CSR) allows the humoral immune response to exploit different effector pathways through specific secondary antibody isotypes. However, the molecular mechanisms and factors that control immunoglobulin (Ig) isotype choice for CSR are unclear. We report that deficiency for the Ikaros transcription factor results in increased and ectopic CSR to IgG(2b) and IgG(2a), and re...
متن کاملImmunoglobulin class-switch recombination deficiencies
Immunoglobulin class-switch recombination deficiencies (Ig-CSR-Ds) are rare primary immunodeficiencies characterized by defective switched isotype (IgG/IgA/IgE) production. Depending on the molecular defect in question, the Ig-CSR-D may be combined with an impairment in somatic hypermutation (SHM). Some of the mechanisms underlying Ig-CSR and SHM have been described by studying natural mutants ...
متن کاملDe novo protein synthesis is required for activation-induced cytidine deaminase-dependent DNA cleavage in immunoglobulin class switch recombination.
Activation-induced cytidine deaminase is required for the DNA cleavage step of Ig class switch recombination (CSR). However, its molecular mechanism is controversial. RNA-editing hypothesis postulates that activation-induced cytidine deaminase deaminates cytosine in an unknown mRNA to generate a new mRNA encoding an endonuclease for CSR and thus predicts that DNA cleavage depends on de novo pro...
متن کاملClass Switch Recombination and Hypermutation Require Activation-Induced Cytidine Deaminase (AID), a Potential RNA Editing Enzyme
Induced overexpression of AID in CH12F3-2 B lymphoma cells augmented class switching from IgM to IgA without cytokine stimulation. AID deficiency caused a complete defect in class switching and showed a hyper-IgM phenotype with enlarged germinal centers containing strongly activated B cells before or after immunization. AID-/- spleen cells stimulated in vitro with LPS and cytokines failed to un...
متن کاملonychomadesis in a patient with immunoglobulin class switch recombination deficiency
immunoglobulin class switch recombination deficiencies (ig csr deficiencies) or hyper igm syndromes (higm) are a group of primary immunodeficiency diseases, characterized by defective cd40 signaling of b cells resulting into a csr and a somatic hypermutation. the affected patients are characterized with reduced serum levels of igg and iga, and normal or elevated level of igm, which lead to incr...
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ژورنال
عنوان ژورنال: Molecular and Cellular Biology
سال: 2012
ISSN: 0270-7306,1098-5549
DOI: 10.1128/mcb.05989-11