Cloning and gene structure of the rod cGMP phosphodiesterase delta subunit gene (PDED) in man and mouse.
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.
Abteilung Medizinische Genetik, Ludwig-Maximilians-Universität München, Germany.
B
B
Lorenz
C
C
Migliaccio
P
P
Lichtner
C
C
Meyer
T M
TM
Strom
M
M
D'Urso
J
J
Becker
A
A
Ciccodicola
T
T
Meitinger
D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary; D005091:Exons; D006801:Humans; D007438:Introns; D051379:Mice; D008969:Molecular Sequence Data; D009154:Mutation; D018807:Polymorphism, Single-Stranded Conformational; D012333:RNA, Messenger / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D017931:DNA Primers; D018076:DNA, Complementary; D012333:RNA, Messenger; D015106:3',5'-Cyclic-GMP Phosphodiesterases