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J Biol Chem, Vol. 273, Issue 49, 32901-32909, December 4, 1998

Co-regulation of Tissue-specific Alternative Human Carnitine Palmitoyltransferase I Gene Promoters by Fatty Acid Enzyme Substrate

Geng-Sheng Yu^§, Yi-Chun Lu, and Tod Gulick^§

From the  Diabetes Unit and Medical Services, Massachusetts General Hospital, Charlestown, Massachusetts 02129 and the ^§ Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115

Carnitine palmitoyltransferase I (CPT-I) catalyzes the rate-determining step in mitochondrial fatty acid -oxidation. CPT-I has two structural genes ( and ) that are differentially expressed among tissues. Our CPT-I isolates from a human cardiac cDNA library contained two different extreme 5'-sequences derived from short alternative first untranslated exons that utilize a common splice acceptor site in exon 2. Primer extension identified single dominant start sites for each transcript, and ribonuclease protection assays showed the presence of one 5'-exon in liver, muscle, and heart mRNAs, indicating that the cognate promoter U (upstream/ubiquitous) is active in each of these tissues. By contrast, mRNAs containing the alternative 5'-exon were present only in muscle and heart, indicating a muscle-specific promoter M (muscle). CPT-I mRNA levels increased markedly in tissues of fasted rats, when circulating free fatty acid concentrations are elevated. Using CPT-I promoter/reporter transient transfection of murine C₂C₁₂ myotubes and HepG2 hepatocytes, fatty acids were found to increase promoter activity in a peroxisome proliferator-activated receptor  (PPAR)-dependent fashion. A promoter fatty acid response element (FARE) was mapped, mutation of which ablated fatty acid-mediated production of both transcripts. PPAR/retinoid X receptor  formed specific complexes with oligonucleotides containing the FARE, and anti-PPAR antibody shifted nuclear protein-DNA complexes, confirming the role of this factor in regulating the expression of this critical metabolic enzyme gene. The constitutive repressor chicken ovalbumin upstream promoter transcription factor competitively binds at the FARE and modulates fatty acid induction of the promoters.

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