title: Cloning of mouse immunoglobulin epsilon gene and its location within the heavy chain gene cluster.
abstract: Mouse immunoglobulin epsilon chain gene was cloned from DNA of a hybridoma producing anti-dinitrophenyl IgE, which was constructed by fusing a spleen cell of a BALB/c mouse with a variant clone of MOPC21 myeloma (IgG1 producer). Because a given active heavy chain constant region (CH) gene is linked to a heavy chain joining segment (JH) gene at its 5' side, the expressed C epsilon gene of the hybridoma was cloned from a phage library containing partial Sau3A digests of IgE hybridoma DNA by using a J gene fragment as a probe. Among 6 X 10(5) phages screened, five positive clones were obtained and three of them were identified as C epsilon gene clones by restriction mapping, Southern blot hybridization, R-loop formation, and partial nucleotide sequence determination. The determined nucleotide sequence predicted the amino acid sequence which resembles a part of the CH3 domain of human epsilon chain. The deletion profile of the C epsilon gene in various myelomas expressing different CH genes indicates that the C epsilon gene is located between the C gamma 2a and C alpha genes. The linkage (5'-epsilon-alpha-3') was directly confirmed by molecular cloning of the overlapping chromosomal segments from newborn mouse DNA.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism*; D005796:Genes; D006801:Humans; D006822:Hybrid Cells / Q000276:immunology; D007073:Immunoglobulin E / Q000235:genetics; D007074:Immunoglobulin G / Q000235:genetics; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D007139:Immunoglobulin epsilon-Chains / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D009693:Nucleic Acid Hybridization; D010954:Plasmacytoma; D013154:Spleen / Q000276:immunology
chemical_list: D004274:DNA, Recombinant; D007074:Immunoglobulin G; D007143:Immunoglobulin Heavy Chains; D007139:Immunoglobulin epsilon-Chains; D007073:Immunoglobulin E; D004262:DNA Restriction Enzymes