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Rod-specific cGMP phosphodiesterase (PDE) is a key enzyme of the phototransduction cascade, and mutations in its catalytic subunits have been associated with retinal degenerative diseases. The bovine delta-subunit solubilises the normally membrane-bound PDE and is the only subunit expressed in extraocular tissues. We isolated the human and mouse orthologs, and found 78% identity at the DNA level and 98% identity at the protein level. The Caenorhabditis elegans homolog shows 69% identity at the protein level. The human PDED gene consisted of 5 exons spanning at least 30 kb of genomic DNA. Northern blot analysis showed a 1.3 kb transcript in human retina, heart, brain, placenta, liver, and skeletal muscle. Fluorescence in situ hybridisation (FISH) and radiation hybrid mapping localised the human PDED gene to chromosome 2q37. A preliminary screen of all 5 exons in 20 unrelated patients with autosomal recessive retinitis pigmentosa revealed no PDED mutations.

Cloning and gene structure of the rod cGMP phosphodiesterase delta subunit gene (PDED) in man and mouse