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Research Article Free access | 10.1172/JCI115845

Modification of the apolipoprotein B gene in HepG2 cells by gene targeting.

R V Farese Jr, L M Flynn, and S G Young

Gladstone Institute of Cardiovascular Disease, Department of Medicine, University of California, San Francisco 94141-9100.

Find articles by Farese, R. in: PubMed | Google Scholar

Gladstone Institute of Cardiovascular Disease, Department of Medicine, University of California, San Francisco 94141-9100.

Find articles by Flynn, L. in: PubMed | Google Scholar

Gladstone Institute of Cardiovascular Disease, Department of Medicine, University of California, San Francisco 94141-9100.

Find articles by Young, S. in: PubMed | Google Scholar

Published July 1, 1992 - More info

Published in Volume 90, Issue 1 on July 1, 1992
J Clin Invest. 1992;90(1):256–261. https://doi.org/10.1172/JCI115845.
© 1992 The American Society for Clinical Investigation
Published July 1, 1992 - Version history
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Abstract

The HepG2 cell line has been used extensively to study the synthesis and secretion of apolipoprotein (apo) B. In this study, we tested whether gene-targeting techniques can be used to inactivate one of the apo B alleles in HepG2 cells by homologous recombination using a transfected gene-targeting vector. Our vector contained exons 1-7 of the apo B gene, in which exon 2 was interrupted by a promoterless neomycin resistance (neo(r)) gene. The recombination of this vector with the cognate gene would inactivate an apo B allele and enable the apo B promoter to activate the transcription of the neo(r) gene. To detect the rare homologous recombinant clone, we developed a novel solid phase RIA that uses the apo B-specific monoclonal antibody MB19 to analyze the apo B secreted by G418-resistant (G418r) clones. Antibody MB19 detects a two-allele genetic polymorphism in apo B by binding to the apo B allotypes MB19(1) and MB19(2) with high and low affinity, respectively. HepG2 cells normally secrete both the apo B MB19 allotypes. Using the MB19 immunoassay, we identified a G418r HepG2 clone that had lost the ability to secrete the MB19(1) allotype. The inactivation of an apo B allele of this clone was confirmed by the polymerase chain reaction amplification of an 865-bp fragment unique to the targeted apo B allele and by Southern blotting of genomic DNA. This study demonstrates that gene-targeting techniques can be used to modify the apo B gene in HepG2 cells and demonstrates the usefulness of a novel solid phase RIA system for detecting apo B gene targeting events in this cell line.

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