Overlapping gene structure of human VLCAD and DLG4 - PubMed

Overlapping gene structure of human VLCAD and DLG4

Changcheng Zhou et al. Gene. 2003.

Abstract

Very-long-chain acyl-CoA dehydrogenase (VLCAD) is a major enzyme catalysing the first step in mitochondrial beta-oxidation of long-chain fatty acids. During analysis of the VLCAD promoter, we discovered that another gene, discs-large-related 4 (DLG4), overlaps VLCAD and is transcribed in the opposite direction. DLG4 encodes postsynaptic density-95 (PSD95) protein, which plays critical roles in the formation and maintenance of synaptic junctions. The transcription start site of the VLCAD gene was determined by primer extension analysis and the overlapping structure of VLCAD and DLG4 was clarified. VLCAD and DLG4 are arranged in a head-to-head orientation on chromosome 17p13, and share a 245 bp overlapping region that contains part of DLG4 exon 1 and the entire exon 1 of VLCAD including 62 bp of protein coding sequence. Despite the overlap of their 5' ends, DLG4 and VLCAD exhibit peak mRNA expression in different tissues, suggesting that they are independently regulated at the transcriptional level. Interestingly, VLCAD and DLG4 genes do not overlap in the mouse or Drosophila genomes.

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