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• W1967324655 abstract "Apolipoprotein (apo) B is the principal apolipoprotein of chylomicrons, very-low-density lipoproteins (VLDL) and low-density lipoproteins (LDL). Patiens with homozygous hypobetalipoproteinemia (HBL), characterized by apoB deficiency, have markedly decreased levels of hepatocyte mRNA as well as intracellular B apolipoprotein, and a virtual absence of plasma apoB. We have cloned, sequenced and analyzed the 5′ regulatory region of the human apoB gene from −899 to +121 bp in normal and hypobetalipoproteinemic subjects. TATA and CAAT boxes were located at −30 and −61, respectively, and two GC-like boxes were identified at positions +56 and +108. The analysis of the HBL sequence revealed two substitutions at positions −838 and −517, when compared to the normal sequence. These substitutions were not present in any known apoB regulatory elements. The transcriptional activities of the homozygous hypobetalipoproteinemic and normal regulatory regions were compared by chloramphenicol acetyltransferase (CAT) assays in Hep G2 cells, and were found to be the same. Therefore, we conclude that the 5′ regulatory region of the HBL apoB gene in this kindred is normal, and the two base substitutions do not affect promoter activity of the apoB gene. These studies suggest that a coding region abnormality in the apoB gene may lead to HBL." @default.
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• W1967324655 date "1989-07-01" @default.
• W1967324655 modified "2023-09-27" @default.
• W1967324655 title "Homozygous hypobetalipoproteinemia: transcriptional regulation and 5′-flanking sequence analysis in an apolipoprotein B deficiency state" @default.
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• W1967324655 doi "https://doi.org/10.1016/0005-2760(89)90208-7" @default.
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• W1967324655 hasPublicationYear "1989" @default.
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