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Cloning and expression of mouse deafness dystonia peptide 1 cDNA.

Complementary DNA of mouse deafness dystonia peptide 1 (DDP1) was isolated from adipocyte cDNA library and expressed in mammalian cells. The sequence shares homology of 92 and 97% on the nucleic acid and the amino acid levels with human DDP1. In comparison to mouse Bruton's tyrosine kinase (Btk) locus, the coding region spans 2 exons and the splice point is the same as human DDP1. Northern blot analysis suggests that mouse DDP1 expresses ubiquitously. In vitro transcription/translation study showed that the cDNA of mouse DDP1 codes about 11 kDa peptide. DDP1 tagged with FLAG localized in mitochondria and cytoplasm of COS7 cells. P19 embryonal carcinoma cells transfected with anti sense DDP1 cDNA were frequently dead after subculture and all the survivals expressed endogenous DDP1 mRNA. Therefore, mouse DDP1 may play an important role to survive in contrast to Tim8p, a yeast homologue, which was unnecessary in yeast.