A point mutation in the extracellular domain of CD4 completely abolishes CD4 T cell development in C57BL/6 mouse

A point mutation in the extracellular domain of CD4 completely abolishes CD4 T cell development in C57BL/6 mouse
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CD4 胞外域的点突变完全阻止了 C57BL/6 小鼠 CD4 T 细胞的发育

DOI:
10.1016/j.molimm.2017.09.015
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发表时间:
2017-12
影响因子:
3.6
通讯作者:
Lu Liaoxun
Lu Liaoxun
中科院分区:
医学3区
文献类型:
--
作者:
Wang Huijie;Li Saichao;Chao Tianzhu;Wang Xugang;Shi Lijin;Zhang Lichen;Liang Yinming;Zheng Qianqian;Lu Liaoxun

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在这项研究中,我们在C57 BL/6小鼠中进行ENU诱变和多参数流式细胞术分析,以发现调节免疫细胞发育的新基因或等位基因。我们发现了一个新的突变等位基因的Cd 4基因,完全阻止了发展的一个主要亚群的T细胞命名为CD 4 T细胞。我们的数据首次在小鼠中通过实验显示了第一胞外结构域的关键作用,通过获得在CD 4的位置99(I99 N)处具有从Ile到Asn的功能缺失突变的小鼠。有趣的是,这种CD 4 I99 N突变蛋白可以在人细胞表面表达,并且mRNA的稳定性也可能受到这种点突变的影响,这表明小鼠中CD 4 T细胞的缺乏根源于CD 4的功能和表达的缺陷。此外,我们将这种新的CD 4 T细胞缺陷模型作为受体小鼠进行过继转移实验,表明它可以成为研究CD 4 T细胞的最佳模型。
In this study, we performed ENU mutagenesis and multi-parameter flow cytometric analysis in C57BL/6 mice to uncover novel genes or alleles regulating immune cell development. We identified a novel mutant allele ofCd4gene which completely blocked development of a major subset of T cells named CD4 T cell. Our data for the first time showed experimentally in mice the critical role of the first extracellular domain, by obtaining mice with a loss of function mutation from Ile to Asn at the position 99 of CD4 (I99N). Interestingly, such CD4I99Nmutant protein can be expressed on the surface of human cells, and the mRNA stability could be also affected by this point mutation, suggesting that absence of CD4 T cells in mice rooted in the deficiency in function and expression of CD4. In addition, we used this novel CD4 T cell deficient model as recipient mice for adoptive transfer experiment, and showed that it could be an optimal model for study of CD4 T cells.
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