Smc3 dosage regulates B cell transit through germinal centers and restricts their malignant transformation.

Smc3 dosage regulates B cell transit through germinal centers and restricts their malignant transformation.
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Smc3 剂量调节 B 细胞通过生发中心并限制其恶性转化。

DOI:
10.1038/s41590-020-00827-8
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发表时间:
2021-03
期刊:
影响因子:
30.5
通讯作者:
Melnick AM
Melnick AM
中科院分区:
医学1区
文献类型:
--
作者:
Rivas MA;Meydan C;Chin CR;Challman MF;Kim D;Bhinder B;Kloetgen A;Viny AD;Teater MR;McNally DR;Doane AS;Béguelin W;Fernández MTC;Shen H;Wang X;Levine RL;Chen Z;Tsirigos A;Elemento O;Mason CE;Melnick AM

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在生发中心(GC)反应期间,B细胞经历了广泛的粘附素复合物的重新分布和它们的基因组的3D重组。然而,在体液免疫应答中粘附素和结构编程的意义是未知的。在这里,我们报告,纯合性缺失Smc 3编码的粘附素ATP酶亚基废除GC的形成,但在显着的对比Smc 3单倍不足诱导GC增生,倾斜的GC极性和受损的浆细胞分化。全基因组染色体构象和转录谱分析揭示了由淋巴瘤表观遗传肿瘤抑制因子Tet 2和Kmt 2d控制的GC B细胞终末分化程序的缺陷,以及Smc 3 wt/- GC B细胞从B细胞转换为浆细胞定义转录因子的失败。Smc 3单倍不足优先损害控制各种淋巴瘤肿瘤抑制基因的增强子元件的连接,因此Smc 3单倍不足加速了Bcl 6组成型表达小鼠的淋巴瘤发生。总的来说,我们的数据表明,在体液免疫中,粘附素促进B细胞向浆细胞表型转换,同时限制其恶性转化的剂量依赖性功能。
During the germinal center (GC) reaction, B cells undergo extensive redistribution of cohesin complex and 3D reorganization of their genomes. Yet, the significance of cohesin and architectural programming in the humoral immune response is unknown. Herein we report that homozygous deletion of Smc3 encoding the cohesin ATPase subunit abrogated GC formation, yet in marked contrast Smc3 haploinsufficiency induced GC hyperplasia, skewing of GC polarity and impaired plasma cell differentiation. Genome-wide chromosomal conformation and transcriptional profiling revealed defects in GC B cell terminal differentiation programs controlled by lymphoma epigenetic tumor suppressors Tet2 and Kmt2d, and failure of Smc3wt/– GC B cells to switch from B cell to plasma cell defining transcription factors. Smc3 haploinsufficiency preferentially impaired connectivity of enhancer elements controlling various lymphoma tumor suppressor genes, and accordingly Smc3 haploinsufficiency accelerated lymphomagenesis in mice with constitutive Bcl6 expression. Collectively, our data indicate a dose-dependent function for cohesin in humoral immunity to facilitate the B cell to plasma cell phenotypic switch, while restricting their malignant transformation.
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