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Immunoglobulin heavy-chain switching in pre-B leukaemias

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Abstract

Immunoglobulin gene expression is initiated in pre-B cells by rearrangements of heavy-chain variable genes V, D and J, for transcription together with the constant region gene Cμ (refs 1–7). The subsequent joining of light-chain V–J genes in the κ or λ families8,9 leads to formation of complete IgM molecules, which are then expressed on the surface of B cells. Heavy-chain isotype switching has been thought to occur later and to involve CH gene rearrangement via deletion of DNA between a switch site 5′ to Cμ and a switch site 5′ to the downstream Cγ, Cε or Cα gene expressed by a mature plasma cell10–15. On the other hand, isotype switching has been seen in human pre-B-cell leukaemias16,17 and in a murine pre-B-cell line before light-chain gene rearrangements and without Cμ gene deletion18,19. To explore further the isotype switching in pre-B cells, we used monoclonal antibodies in immunofluorescence assays to allow unambiguous assignment of the heavy-chain isotypes expressed by individual leukaemic cells in 11 pre-B-cell leukaemias. Switching in these leukaemic clones invariably led to expression of γ1 heavy-chain and κ light-chain determinants, occasionally together with γ4 and α. These results indicate a nonrandom order for heavy-chain isotype switching and for light-chain isotype expression, and also suggest that a mechanism exists for coordinating the two events.

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Kubagawa, H., Mayumi, M., Crist, W. et al. Immunoglobulin heavy-chain switching in pre-B leukaemias. Nature 301, 340–342 (1983). https://doi.org/10.1038/301340a0

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