The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 154, 1554-1569, Copyright © 1981 by Rockefeller University Press

ARTICLES

Somatically generated mouse myeloma variants synthesizing IgA half- molecules

DJ Zack, SL Morrison, WD Cook, W Dackowski and MD Scharff

Whereas mouse myelomas that secrete IgA half-molecules have been shown to arise in vivo, their origin has not been definitely established. We show that somatic variants secreting phenotypically similar molecules can arise directly from the normal IgA-secreting myelomas S107 and W3082. In addition to being improperly assembled, the variant proteins have distinct carboxy-terminal deletions and an aberrant heavy-light chain disulfide bond. For at least one of the variants, variable region serology and affinity for hapten are both unaffected by these changes. Southern and Northern blot analyses indicate normal size DNA restriction fragments and mRNA, suggesting premature termination as the mechanism of deletion. These results are discussed in relation to possible mutational hot spots and long-range interdomain interactions.
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