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Accessibility Control of Recombination at Immunoglobulin Locus

机译:免疫球蛋白基因座重组的可及性控制

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摘要

During B cell development, two somatic DNA recombination events occur at the immunoglobulin heavy chain loci: VDJ recombination and class switch recombination (CSR). VDJ recombination assembles antigen receptor genes from a pool of gene segments. CSR exchanges the m constant region of the immunoglobulin heavy chain gene for the other isotypes (γ1, γ2a, γ2b, γ3, α or ε). In both cases, the target specificity of recombination reactions seems to be regulated by structural changes of the target chromatin. In fact, many studies support this notion, called the “accessibility model”. In recent years, covalent modifications of histones have gained prominence as epigenetic markers that alter the properties of the associated DNA and contribute to structural changes of the target chromatin. This review focuses on the control of CSR by modulation of accessibility, and the role of histone modifications and germline transcription in CSR.
机译:在B细胞发育过程中,免疫球蛋白重链基因座发生两个体细胞DNA重组事件:VDJ重组和类开关重组(CSR)。 VDJ重组从一组基因片段中组装抗原受体基因。 CSR将免疫球蛋白重链基因的m个恒定区交换为其他同种型(γ1,γ2a,γ2b,γ3,α或ε)。在这两种情况下,重组反应的靶标特异性似乎都受到靶标染色质结构变化的调节。实际上,许多研究都支持这种称为“可访问性模型”的概念。近年来,组蛋白的共价修饰已成为表观遗传标记,可改变相关DNA的特性并促进目标染色质的结构变化,因此倍受关注。本文综述了通过调节可及性来控制CSR,以及组蛋白修饰和种系转录在CSR中的作用。

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