The human beta-subunit of rod photoreceptor cGMP phosphodiesterase: complete retinal cDNA sequence and evidence for expression in brain.
We have identified and sequenced cDNA clones that encode for the human beta-subunit of rod cGMP phosphodiesterase (PDEB). A single 2565-bp open reading frame that codes for an 854-amino-acid protein was identified. The human beta-subunit protein is 90% identical to the bovine beta-subunit and 91% identical to the mouse protein. Northern blot analysis indicates that the gene is expressed as an abundant 3.5-kb transcript in retina and as a rare 2.9-kb transcript in brain. The isolation of cDNAs from human brain cDNA libraries confirms the brain as a site of expression for this gene. The molecular defect underlying retinal degeneration in the rd mouse has been found to be a nonsense mutation in the beta-subunit of the mouse cGMP PDE, resulting in a truncated protein (Pittler et al., 1991b, Proc. Natl. Acad. Sci. USA. 88: 8322-8326). The molecular cloning of the cDNA encoding for the PDEB represents the first step in establishing whether this gene plays a causative role in any one of the several human hereditary retinopathies or, based on its localization to chromosome 4p 16.3, in the pathogenesis of Huntington disease.
Collins
C
C
Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Hutchinson
G
G
Kowbel
D
D
Riess
O
O
Weber
B
B
Hayden
M R
MR
D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000737:chemistry / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000201:enzymology; D002417:Cattle; D004247:DNA / Q000235:genetics*; D015870:Gene Expression; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010786:Photoreceptor Cells / Q000201:enzymology*; D011487:Protein Conformation; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
D004247:DNA; D015106:3',5'-Cyclic-GMP Phosphodiesterases