A variant in human AIOLOS impairs adaptive immunity by interfering with IKAROS.

A variant in human AIOLOS impairs adaptive immunity by interfering with IKAROS.
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DOI:
10.1038/s41590-021-00951-z
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发表时间:
2021-07
期刊:
影响因子:
30.5
通讯作者:
Morio T
Morio T
中科院分区:
医学1区
文献类型:
--
作者:
Yamashita M;Kuehn HS;Okuyama K;Okada S;Inoue Y;Mitsuiki N;Imai K;Takagi M;Kanegane H;Takeuchi M;Shimojo N;Tsumura M;Padhi AK;Zhang KYJ;Boisson B;Casanova JL;Ohara O;Rosenzweig SD;Taniuchi I;Morio T

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在这里,我们报告了一种人类遗传性适应性免疫功能障碍,主要表现为B细胞分化缺陷,由杂合IKZF 3错义变体引起,导致编码的AIOLOS蛋白的DNA结合结构域内的甘氨酸到精氨酸的替换。使用携带相应变体并重现B和T细胞表型的小鼠,我们表明突变的AIOLOS同源二聚体和AIOLOS-IKAROS异源二聚体不结合典型的AIOLOS/IKAROS DNA序列。此外,含有一个突变AIOLOS的同源二聚体和异源二聚体结合到缺乏两个典型基序的基因组区域。然而,从突变体AIOLOS中去除二聚化能力恢复了B细胞发育。因此,适应性免疫缺陷是由AIOLOS变体劫持IKAROS功能引起的。异源二聚体干扰是一种新的常染色体显性遗传机制,通过异源二聚体伴侣的突变损害蛋白质功能,导致先天性免疫缺陷。
Here, we report a human-inherited impaired adaptive immunity disorder, which predominantly manifested as a B cell differentiation defect, caused by a heterozygous IKZF3 missense variant, resulting in a glycine to arginine replacement within the DNA binding domain of the encoded AIOLOS protein. Using mice that bear the corresponding variant and recapitulate the B and T cell phenotypes, we show that the mutant AIOLOS homodimers and AIOLOS–IKAROS heterodimers did not bind the canonical AIOLOS/IKAROS DNA sequence. Additionally, homodimers and heterodimers containing one mutant AIOLOS bound to genomic regions lacking both canonical motifs. However, the removal of the dimerization capacity from mutant AIOLOS restored B cell development. Hence, the adaptive immunity defect is caused by the AIOLOS variant hijacking IKAROS function. Heterodimeric interference is a novel mechanism of autosomal dominance that causes inborn errors of immunity by impairing protein function via the mutation of its heterodimeric partner.
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