title: Genomic organization, chromosomal localization, and alternative splicing of the human phosphodiesterase 8B gene.
abstract: We have characterized the gene for human phosphodiesterase 8B, PDE8B, and cloned the full-length cDNA for human PDE8B (PDE8B1) and two splice variants (PDE8B2 and PDE8B3). The PDE8B gene is mapped to the long arm of chromosome 5 (5q13) and is composed of 22 exons spanning over approximately 200kb. The donor and acceptor splice site sequences match the consensus sequences for the exon-intron boundaries of most eukaryotic genes. PDE8B1 encodes an 885 amino acid enzyme, containing an N-terminal REC domain, a PAS domain, and a C-terminal catalytic domain. PDE8B2 and PDE8B3 both have deletion in the PAS domain and encode 838 and 788 amino acid proteins, respectively. RT-PCR analysis revealed that while PDE8B1 is the most abundant variant in thyroid gland, PDE8B3, but not PDE8B1, is the most abundant form in brain. These findings suggest that selective usage of exons produces three different PDE8B variants that exhibit a tissue-specific expression pattern.
authors.affiliation: Department of Molecular and Cellular Pharmacology, Mie University School of Medicine, 2-174 Edobashi, Tsu, 514-8507, Mie, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hayashi
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Shimada
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Takaaki
authors.initials: T
authors.lastname: Hama
authors.forename: Toshio
authors.initials: T
authors.lastname: Tanaka
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000096:biosynthesis* / Q000235:genetics* / Q000378:metabolism; D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000737:chemistry; D001921:Brain / Q000201:enzymology; D002874:Chromosome Mapping; D002895:Chromosomes, Human, Pair 5; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D005091:Exons; D006801:Humans; D007438:Introns; D008957:Models, Genetic; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D013961:Thyroid Gland / Q000201:enzymology; D014018:Tissue Distribution
chemical_list: D000596:Amino Acids; D018076:DNA, Complementary; D015105:3',5'-Cyclic-AMP Phosphodiesterases; C468781:PDE8B protein, human