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• W1523608977 abstract "Abstract We have isolated and characterized a 2.5-kilobase pairs genomic DNA fragment which includes the 5'-flanking region and the first and second exons of the human apolipoprotein (apo) A-I gene. The major transcriptional start site was determined by primer extension analysis and is 235 base pairs (bp) upstream from the AUG translational start codon in liver and 234 bp upstream in the intestine. TATA box-like and CAT box-like sequences and two GC box sequences are present in the intestine 30, 108, 220, and 440 bp upstream, respectively, from the transcriptional start site. Fragments of 570 bp (-487 to +71) and 2.15 kilobase pairs (-2067 to +99) containing the 5'-flanking region of the apoA-I gene were fused upstream to the bacterial chloramphenicol acetyltransferase (CAT) gene. These constructs, designated pA-I(0.6)CAT and pA-I(2.2)CAT, respectively, were introduced into human oral epithelial cells (KB), mouse NIH 3T3 cells, Chinese hamster ovary (CHO) cells, human hepatoma cells (Hep G2), human duodenal epithelial cells (Hutu 80), and human colonic epithelial cells (Caco-2) by calcium phosphate coprecipitation. When compared with control vectors, highly efficient CAT expression of both the pA-I(0.6)CAT and pA-I(2.2)CAT constructs were observed only in cells derived from the liver (Hep G2) and intestine (Caco-2), which is consistent with the tissue specificity of expression of the native gene. Analysis of deletion mutants of the human apoA-I 5'-flanking region revealed that: 1) the region from -250 to -199 bp, from -487 to -413 bp, and -1021 to -691 bp upstream from the transcriptional start site contain sequences required for maximum gene expression; and 2) the regions from -2067 to -1476 bp and -199 to -80 bp contain the sequences required for tissue-specific repression of apoA-I gene expression in non-apoA-I producing cells." @default.
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• W1523608977 date "1988-12-01" @default.
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• W1523608977 title "Tissue-specific expression of apolipoprotein A-I (ApoA-I) is regulated by the 5′-flanking region of the human ApoA-I gene." @default.
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• W1523608977 doi "https://doi.org/10.1016/s0021-9258(19)81391-1" @default.
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