title: Human monoamine oxidase A and B genes exhibit identical exon-intron organization.
abstract: Monoamine oxidases A and B [MAOA and MAOB; amine:oxygen oxidoreductase (deaminating) (flavin-containing), EC 1.4.3.4] play important roles in the metabolism of neuroactive, vasoactive amines and the Parkinsonism-producing neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Human MAOA and MAOB genes isolated from X chromosome-specific libraries span at least 60 kilobases, consist of 15 exons, and exhibit identical exon-intron organization. Exon 12 codes for the covalent FAD-binding-site and is the most conserved exon; the MAOA and MAOB exon 12 products share 93.9% peptide identity. These results suggest that MAOA and MAOB are derived from duplication of a common ancestral gene and provide insight on the structural/functional relationship of the enzyme products.
authors.affiliation: Department of Molecular Pharmacology and Toxicology, School of Pharmacy, University of Southern California, Los Angeles 90033.
authors.forename: J
authors.initials: J
authors.lastname: Grimsby
authors.forename: K
authors.initials: K
authors.lastname: Chen
authors.forename: L J
authors.initials: LJ
authors.lastname: Wang
authors.forename: N C
authors.initials: NC
authors.lastname: Lan
authors.forename: J C
authors.initials: JC
authors.lastname: Shih
mesh_terms: D001483:Base Sequence; D005091:Exons; D005796:Genes; D006801:Humans; D008969:Molecular Sequence Data; D008995:Monoamine Oxidase / Q000235:genetics*; D015183:Restriction Mapping
chemical_list: D008995:Monoamine Oxidase