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The Journal of Immunology, 1999, 163: 2028-2040.
Copyright © 1999 by The American Association of Immunologists

Switch Recombination in a Transfected Plasmid Occurs Preferentially in a B Cell Line That Undergoes Switch Recombination of Its Chromosomal Ig Heavy Chain Genes1

Janet Stavnezer2,*, Sean P. Bradley*, Norman Rousseau*, Todd Pearson*, Ananth Shanmugam{dagger}, Debra J. Waite*, Paul R. Rogers* and Amy L. Kenter{dagger}

* Department of Molecular Genetics and Microbiology and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester MA 01655; and {dagger} Department of Microbiology and Immunology, University of Illinois College of Medicine, Chicago IL 60612

Ab class switching is induced upon B cell activation in vivo by immunization or infection or in vitro by treatment with mitogens, e.g. LPS, and results in the expression of different heavy chain constant region (CH) genes without a change in the Ab variable region. This DNA recombination event allows Abs to alter their biological activity while maintaining their antigenic specificity. Little is known about the molecular mechanism of switch recombination. To attempt to develop an assay for enzymes, DNA binding proteins, and DNA sequences that mediate switch recombination, we have constructed a plasmid DNA substrate that will undergo switch recombination upon stable transfection into the surface IgM+ B cell line (I.29µ), a cell line capable of undergoing switch recombination of its endogenous genes. We demonstrate that recombination occurs between the two switch regions of the plasmid, as assayed by PCRs across the integrated plasmid switch regions, followed by Southern blot hybridization. Nucleotide sequence analysis of the PCR products confirmed the occurrence of Sµ-S{alpha} recombination in the plasmid. Recombination of the plasmid in I.29µ cells does not require treatment with inducers of switch recombination, suggesting that recombinase activity is constitutive in I.29µ cells. Recombination does not require high levels of transcription across the switch regions of the plasmid. Fewer recombination events are detected in four different B and T cell lines that do not undergo switch recombination of their endogenous genes.




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