Abstract
Adipose differentiation-related protein (ADRP) is a novel 50-kDa membrane-associated protein whose message levels are induced rapidly and maximally after triggering adipocyte differentiation. The gene encoding mouse ADRP has been isolated and characterized from four overlapping λ phage clones. The gene spans 14 kb and contains 8 exons and 7 introns. Exons range in size from 50 to 696 bp and intron sizes range from 87 bp to 4.3 kb. Major and minor transcription initiation sites were determined 76 and 78 bp, respectively, upstream of the initiator methionine. A TATTTTA sequence is centered 30 bp upstream of the major transcription start site, and within the 5′-flanking region there are several putative transcription factor binding sites. ADRP has been mapped to chromosome 4, specifically between the b and Ifa loci. A second ADRP-like gene was isolated and partially characterized. This second locus is not expressed in 12 different mouse tissues and shares 87% sequence similarity to ADRP over exon and intron regions analyzed. Finally, this is the first reported genomic structure of ADRP.
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