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To gain insight into the regulation of expression of peroxisome proliferator-activated receptor (PPAR) isoforms, we have determined the structural organization of the mouse PPAR gamma (mPPAR gamma) gene. This gene extends &gt; 105 kb and gives rise to two mRNAs (mPPAR gamma 1 and mPPAR gamma 2) that differ at their 5' ends. The mPPAR gamma 2 cDNA encodes an additional 30 amino acids N-terminal to the first ATG codon of mPPAR gamma 1 and reveals a different 5' untranslated sequence. We show that mPPAR gamma 1 mRNA is encoded by eight exons, whereas the mPPAR gamma 2 mRNA is encoded by seven exons. Most of the 5' untranslated sequence of mPPAR gamma 1 mRNA is encoded by two exons, whereas the 5' untranslated sequence and the extra 30 N-terminal amino acids of mPPAR gamma 2 are encoded by one exon, which is located between the second and third exons coding for mPPAR gamma 1. The last six exons of mPPAR gamma gene code for identical sequences in mPPAR gamma 1 and mPPAR gamma 2 isoforms. The mPPAR gamma 1 and mPPAR gamma 2 isoforms are transcribed from different promoters. The mPPAR gamma gene has been mapped to chromosome 6 E3-F1 by in situ hybridization using a biotin-labeled probe. These results establish that at least one of the PPAR genes yields more than one protein product, similar to that encountered with retinoid X receptor and retinoic acid receptor genes. The existence of multiple PPAR isoforms transcribed from different promoters could increase the diversity of ligand and tissue-specific transcriptional responses.

proceedings of the national academy of sciences of the united states of america

Structural organization of mouse peroxisome proliferator-activated receptor gamma (mPPAR gamma) gene: alternative promoter use and different splicing yield two mPPAR gamma isoforms.