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. 1982 Sep;2(9):1134–1144. doi: 10.1128/mcb.2.9.1134

Isolation and characterization of a variant of mouse plasmacytoma J558 synthesizing a 110,000-dalton immunoglobulin heavy chain and of secondary variants synthesizing either a 55,000-dalton or an 80,000-dalton immunoglobulin heavy chain: possible implications.

L Matsuuchi, S L Morrison
PMCID: PMC369907  PMID: 6184610

Abstract

A mutant has been isolated from the J558 (immunoglobulin A, lambda, anti-alpha 1 leads to 3 dextran) cell line which synthesizes a heavy-chain immunoglobulin twice the size of normal heavy chain. Secondary variants that synthesized heavy chains either 1.5 times as large as wild type or the same size as wild type were identified. All mutants were serologically immunoglobulin continued to bind antigen, and retained the individual idiotype of the parent. Northern blot analysis and in vitro synthesis studies showed that the large heavy chains were primary synthetic products and not the consequence of abnormal covalent bonds. Cleavage of genomic DNA with restriction endonucleases and molecular hybridization studies showed new fragments in the 2 X and 1.5 X mutants which disappeared in the 1 X revertant. These data cannot easily be reconciled with the mutants arising either by unequal recombination or gene conversion. Further molecular characterization of these mutants should give additional insight into immunoglobulin gene evolution.

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Selected References

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