Somatic hypermutation as a generator of antinuclear antibodies in a murine model of systemic autoimmunity.

Somatic hypermutation as a generator of antinuclear antibodies in a murine model of systemic autoimmunity.
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DOI:
10.1084/jem.20092712
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发表时间:
2010-09-27
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wysocki LJ
Wysocki LJ
中科院分区:
其他
文献类型:
--
作者:
Guo W;Smith D;Aviszus K;Detanico T;Heiser RA;Wysocki LJ

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系统性红斑狼疮(SLE)的特点是高亲和力的抗核抗体(ANA),几乎肯定是T细胞依赖的免疫反应的产物。ANA第三互补决定区(CDR3)的关键氨基酸是来自V(D)J重组还是体细胞超突变(SHM)尚不清楚。我们研究了一种SLE小鼠模型,在该模型中,ANA V区域内的所有体细胞突变,包括CDR3中的体细胞突变,都可以明确地识别出来。突变逆转分析表明,ANA主要来自非自身反应性B细胞,通过SHM使免疫球蛋白基因多样化。这个模型提供的分辨率使我们能够证明一个ANA克隆是在VH基因替换事件后由SHM产生的。产生精氨酸替换的突变很常见,主要(66%)是由两个密码子的碱基变化引起的:AGC和AGT。这些密码子在小鼠和人类的V基因谱系中含量丰富。我们的发现揭示了SHM在ANA发展中的主要作用,并强调了自我耐受检查点在突变后B细胞分化阶段的重要性。
Systemic lupus erythematosus (SLE) is characterized by high-avidity IgG antinuclear antibodies (ANAs) that are almost certainly products of T cell–dependent immune responses. Whether critical amino acids in the third complementarity-determining region (CDR3) of the ANA originate from V(D)J recombination or somatic hypermutation (SHM) is not known. We studied a mouse model of SLE in which all somatic mutations within ANA V regions, including those in CDR3, could be unequivocally identified. Mutation reversion analyses revealed that ANA arose predominantly from nonautoreactive B cells that diversified immunoglobulin genes via SHM. The resolution afforded by this model allowed us to demonstrate that one ANA clone was generated by SHM after a VH gene replacement event. Mutations producing arginine substitutions were frequent and arose largely (66%) from base changes in just two codons: AGC and AGT. These codons are abundant in the repertoires of mouse and human V genes. Our findings reveal the predominant role of SHM in the development of ANA and underscore the importance of self-tolerance checkpoints at the postmutational stage of B cell differentiation.
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