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Dosage effect of zero to three functional LBR-genes in vivo and in vitro

机译:体内和体外零至三个功能性LBR基因的剂量效应

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The Lamin B receptor (LBR) is a pivotal architectural protein in the nuclear envelope. Mutations in the Lamin B receptor lead to nuclear hyposegmentation (Pelger-Hu?t anomaly). We have exactly quantified the nuclear lobulation in neutrophils from individuals with 0, 1, 2, and 3 functional copies of the lamin B receptor gene and analyzed the effect of different mutation types. Our data demonstrate that there is a highly significant gene-dosage effect between the gene copy number and the nuclear segmentation index of neutrophils. This finding is paralleled by a dose-dependent increase in LBR protein and staining intensity of the nuclear membrane in corresponding lymphoblastoid cell lines, which demonstrates a significant correlation on the protein level as well. We further show that LBR expression continually increases during granulopoiesis in vitro from human precursor cells with ovoid nuclei to multi-segmented neutrophil nuclei 11 days later, indicating relevance for regular human granulopoiesis. Altogether, LBR is a unique model that will allow the systematic study of gene-dosage effects and of modifying endogeneous and exogeneous factors on granulopoiesis.
机译:Lamin B受体(LBR)是核膜中的关键结构蛋白。 Lamin B受体的突变会导致核节段分裂(Pelger-Hu?t异常)。我们已经精确定量了lamin B受体基因的0、1、2和3功能拷贝的个体在中性粒细胞中的核小叶形成,并分析了不同突变类型的影响。我们的数据表明,在基因拷贝数和嗜中性粒细胞的核分割指数之间有非常显着的基因剂量效应。这一发现与相应的淋巴母细胞细胞系中LBR蛋白的剂量依赖性增加和核膜染色强度相平行,这也证明了蛋白质水平上的显着相关性。我们进一步显示,LBR表达在造粒过程中从具有卵圆形核的人前体细胞到多段中性粒细胞核在体外培养11天后不断增加,这表明与正常人的粒细胞形成具有相关性。总而言之,LBR是一个独特的模型,将允许系统地研究基因剂量效应以及修饰粒细胞生成的内源性和外源性因素。

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