title: Genomic structure and chromosome mapping of the genes encoding clathrin-associated adaptor medium chains mu1A (Ap1m1) and mu1B (Ap1m2).
abstract: The protein mu1B is a member of the medium chain family of the clathrin-associated adaptor complex and is expressed exclusively in epithelial cells. We determined the genomic structure of previously cloned murine genes for mu1B (Ap1m2) and its closely related homolog, mu1A (Ap1m1). Comparison of their genomic structures revealed that the positions of introns are identical between these two genes, except for the insertion of an additional intron in Ap1m1 (intron 4). By contrast, these structures are different from that of the more distantly related Ap2m1 gene encoding mu2. Taken together with the similarity of amino acid sequences among these genes, the data presented in this study suggest that Ap1m1/2 and Ap2m1 diverged long before the separation of Ap1m1 and Ap1m2, which most likely resulted from a relatively recent gene duplication. We also mapped AP1M2 to human chromosome 19p13.2 and Ap1m2 to the proximal region of mouse chromosome 9. The results are consistent with the fact that these regions are syntenic.
authors.affiliation: Department of Molecular Genetics, Chiba University Graduate School of Medicine, Chiba, Japan.
authors.forename: F
authors.initials: F
authors.lastname: Nakatsu
authors.forename: T
authors.initials: T
authors.lastname: Kadohira
authors.forename: D J
authors.initials: DJ
authors.lastname: Gilbert
authors.forename: N A
authors.initials: NA
authors.lastname: Jenkins
authors.forename: H
authors.initials: H
authors.lastname: Kakuta
authors.forename: N G
authors.initials: NG
authors.lastname: Copeland
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: H
authors.initials: H
authors.lastname: Ohno
mesh_terms: D033961:Adaptor Protein Complex 1; D033962:Adaptor Protein Complex 2; D033963:Adaptor Protein Complex 3; D033965:Adaptor Protein Complex alpha Subunits; D033983:Adaptor Protein Complex mu Subunits; D033942:Adaptor Proteins, Vesicular Transport; D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics; D002874:Chromosome Mapping; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics; D003001:Cloning, Molecular; D003433:Crosses, Genetic; D019143:Evolution, Molecular; D005091:Exons / Q000235:genetics*; D005260:Female; D020440:Gene Duplication; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007438:Introns / Q000235:genetics*; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D017386:Sequence Homology, Amino Acid
chemical_list: C438883:AP1M1 protein, human; C499064:AP1M2 protein, human; C510070:AP3M2 protein, human; D033961:Adaptor Protein Complex 1; D033962:Adaptor Protein Complex 2; D033963:Adaptor Protein Complex 3; D033965:Adaptor Protein Complex alpha Subunits; D033983:Adaptor Protein Complex mu Subunits; D033942:Adaptor Proteins, Vesicular Transport; C499063:Ap1m1 protein, mouse; C438884:Ap1m2 protein, mouse; C510071:Ap3m2 protein, mouse; D008565:Membrane Proteins; C499066:adaptor protein complex 1, mu 1 subunit; C499065:adaptor protein complex 1, mu 2 subunit; C438886:adaptor protein complex 2, mu 2 subunit