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Mol Cell Biol. 1986 November; 6(11): 3807-3814

Mouse apolipoprotein A-IV gene: nucleotide sequence and induction by a high-lipid diet.

ABSTRACT

Apolipoprotein A-IV (apo A-IV) functions in conjunction with other apolipoproteins to form lipoprotein particles which are involved in lipid homeostasis. In this report we present the nucleotide sequence of the mouse apo A-IV gene and demonstrate its induction in the liver by chronically high dietary lipid. The apo A-IV gene consists of three exons and two introns. The introns separate evolutionarily conserved and functional polypeptide domains. Intron 1 divides most of the apo A-IV signal peptide from the amino terminus of the mature plasma protein. The second intron separates a highly evolutionarily conserved, variant amphipathic peptide repeat from the remainder of the mature apo A-IV protein. The 5' flanking region has several interesting features. The apo A-IV gene has variant TATA and CAT box sequences, TTTAAA and CCAACG, respectively. There are five G-rich direct repeats of 10 nucleotides and a short inverted repeat in the 5' flanking region. We speculate that these sequence elements in the 5' flanking region may be involved in the regulation of apo A-IV gene expression. We also show that chronically high dietary lipid induces liver apo A-IV levels 10-fold in C57BL/6 mice, a strain susceptible to atherosclerotic lesions, while we observed no induction in nonsusceptible BALB/c and C3H mice.

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