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. 2002 Sep 15;366(Pt 3):767–775. doi: 10.1042/BJ20011821

Genomic organization of the mouse peroxisome proliferator-activated receptor beta/delta gene: alternative promoter usage and splicing yield transcripts exhibiting differential translational efficiency.

Leif K Larsen 1, Ez-Zoubir Amri 1, Susanne Mandrup 1, Corinne Pacot 1, Karsten Kristiansen 1
PMCID: PMC1222822  PMID: 12059785

Abstract

Peroxisome proliferator-activated receptor (PPAR) beta/delta is ubiquitously expressed, but the level of expression differs markedly between different cell types. In order to determine the molecular mechanisms governing PPARbeta/delta gene expression, we have isolated and characterized the mouse gene encoding PPARbeta/delta. The gene spans approx. 41 kb and comprises 11 exons of which the six exons located in the 3'-end of the gene are included in all transcripts. Primer-extension and 5'-rapid amplification of cDNA ends experiments revealed the presence of multiple transcription start points and splice variants, originating from the use of at least four different promoters. One of these transcription start points was found to be used predominantly in all tissues examined. Initiation from this major transcription start point gives rise to a transcript with a 548 nt 5'-untranslated leader containing eight upstream AUG codons. We show that the presence of the 548 nt leader resulted in a low translational efficiency of the corresponding PPARbeta/delta mRNA and propose, based on structural features of the 5'-untranslated region, that translational initiation may be mediated via an internal ribosome entry site-dependent mechanism.

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Selected References

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