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

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Abstract

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-Huët 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. © 2010 Landes Bioscience.

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Gravemann, S., Schnipper, N., Meyer, H., Vaya, A., Nowaczyk, M. J. M., Rajab, A., … Hoffmann, K. (2010). Dosage effect of zero to three functional LBR-genes in vivo and in vitro. Nucleus, 1(2). https://doi.org/10.4161/nucl.11113

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