Pro-B cells sense productive immunoglobulin heavy chain rearrangement irrespective of polypeptide production

Pro-B cells sense productive immunoglobulin heavy chain rearrangement irrespective of polypeptide production
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Pro-B 细胞能够感知生产性免疫球蛋白重链重排,而与多肽的产生无关

DOI:
10.1073/pnas.1019224108
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发表时间:
2011
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Jäck H-M
Jäck H-M
中科院分区:
--
文献类型:
--
作者:
Lutz J;Müller W;Raman C;Jäck H-M

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B淋巴细胞的发育是由功能重排的免疫球蛋白重链(H)和轻链基因(L)的蛋白质产物决定的。免疫球蛋白重排始于IgH基因位点的Pro-B细胞。如果前B细胞产生一个有效的等位基因,它们就会组装一个前B细胞受体复合体,这表明它们分化为前B细胞并进行克隆性扩张。前B细胞受体信号也被认为通过阻止进一步的IgH重排而导致等位基因排斥。在这里,我们在两个独立的小鼠模型中表明,稳定的μH基因的积累不编码μH链蛋白,特异性地损害前B细胞的分化,并以剂量依赖的方式减少重排的IgH基因的频率。由于非编码的IgH基因通常被无义介导的基因衰退机制迅速降解,我们认为,基因稳定性的差异使得Pro-B细胞能够区分产生和非产生的Ig基因重排,因此μH基因可能有助于有效地排除H链等位基因。
B-lymphocyte development is dictated by the protein products of functionally rearranged Ig heavy (H) and light (L) chain genes. Ig rearrangement begins in pro-B cells at the IgH locus. If pro-B cells generate a productive allele, they assemble a pre-B cell receptor complex, which signals their differentiation into pre-B cells and their clonal expansion. Pre-B cell receptor signals are also thought to contribute to allelic exclusion by preventing further IgH rearrangements. Here we show in two independent mouse models that the accumulation of a stabilized μH mRNA that does not encode μH chain protein specifically impairs pro-B cell differentiation and reduces the frequency of rearranged IgH genes in a dose-dependent manner. Because noncoding IgH mRNA is usually rapidly degraded by the nonsense-mediated mRNA decay machinery, we propose that the difference in mRNA stability allows pro-B cells to distinguish between productive and nonproductive Ig gene rearrangements and that μH mRNA may thus contribute to efficient H chain allelic exclusion.
小鼠 kappa 链基因的转录:对等位基因排除的影响。
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DOI: 10.4049/jimmunol.177.10.7007
发表时间: 2006-11-15
影响因子: 4.4
作者:
Lutz, Johannes;Muller, Werner;Jack, Hans-Martin
通讯作者: Jack, Hans-Martin