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Dystrophin is the protein product which is absent in Duchenne muscular dystrophy (DMD). In mammalian skeletal muscle, dystrophin is found in association with several integral and peripheral membrane proteins, forming a complex known as the dystrophin glycoprotein complex (DGC). In an expressed sequence tag (EST) database search to identify new dystrophin related genes, we isolated EST00891 which showed 57% homology to the cysteine-rich domain of dystrophin and localized to 18q12.1–12.2. This EST is also highly homologous (90%) to the  Torpedo californica  post-synaptic 87 kDa phosphoprotein. Screening human adult brain and skeletal muscle cDNA libraries with this EST resulted in cloning multiple cDNAs which encode several splice forms all homologous to the C-terminal domain of dystrophin. The largest open reading frame isolated shows 94% homology (86% identity) to the  Torpedo  87 kDa protein and 50% homology to the cysteine-rich and carboxy-terminal domains of dystrophin. The other cDNAs isolated encode smaller splice forms of this gene which we have named dystrobrevin. The tissue distribution of dystrobrevin mRNA shows five distinct transcripts which are preferentially expressed between different tissues. In addition, antibodies against either the  Torpedo  87 kDa protein or human dystrobrevin demonstrate that at least three of the splice forms are translated as proteins in human brain tissue extracts.

human molecular genetics

Cloning and Characterization of the Human Homologue of a Dystrophin Related Phosphoprotein Found at the  Torpedo  Electric Organ Post-Synaptic Membrane