title: The complete murine immunoglobulin class switch region of the alpha heavy chain gene-hierarchic repetitive structure and recombination breakpoints.
abstract: A 7255-base pair (bp) sequence, including the previously sequenced murine segments of I alpha, S alpha, and C alpha, has been completed. Homology matrix comparison revealed a switch repetitive region of 4.2 kilobases (kb) composed of 20-80-bp homology runs, including the previously assigned S alpha region. We distinguished several stretches of duplication, i.e. the central 0.8-kb repetitive region, with some 80-bp staggered consensus repeats containing 20-30-bp subsets, made up of the primordial pentamers CTG(A/G)G. All the break-points of the S alpha switch recombination, including those generated by the translocation of the c-myc protooncogene and those catalyzed by bacterial extracts, are located within the consensus sequence subsets of the 4.2-kb repetitive region.
authors.affiliation: Department of Biophysics, Faculty of Science, Kyoto University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Arakawa
authors.forename: T
authors.initials: T
authors.lastname: Iwasato
authors.forename: H
authors.initials: H
authors.lastname: Hayashida
authors.forename: A
authors.initials: A
authors.lastname: Shimizu
authors.forename: T
authors.initials: T
authors.lastname: Honjo
authors.forename: H
authors.initials: H
authors.lastname: Yamagishi
mesh_terms: D000818:Animals; D001483:Base Sequence; D004247:DNA; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D007134:Immunoglobulin Switch Region / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D011995:Recombination, Genetic; D012689:Sequence Homology, Nucleic Acid
chemical_list: D007143:Immunoglobulin Heavy Chains; D004247:DNA