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Related Experiment Videos

Somatically generated mouse myeloma variants synthesizing IgA half-molecules

D J Zack, S L Morrison, W D Cook

    The Journal of Experimental Medicine
    |November 1, 1981
    PubMed
    Summary
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    Somatic variants from normal IgA-secreting myelomas can produce improperly assembled IgA half-molecules. These variants exhibit carboxy-terminal deletions, suggesting premature termination as the deletion mechanism.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Cancer Research

    Background:

    • Mouse myelomas secreting immunoglobulin A (IgA) half-molecules have been observed in vivo.
    • The precise origin and mechanism of formation for these half-molecule-secreting myelomas remain unclear.

    Purpose of the Study:

    • To investigate the origin of IgA half-molecule secretion in mouse myelomas.
    • To characterize the molecular alterations in somatic variants derived from normal IgA-secreting myelomas.

    Main Methods:

    • Somatic variant isolation from IgA-secreting myeloma cell lines (S107 and W3082).
    • Analysis of protein assembly, carboxy-terminal deletions, and heavy-light chain disulfide bonds.
    • Assessment of variable region serology and hapten affinity.
    • Southern and Northern blot analyses to examine DNA and mRNA.

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    Main Results:

    • Somatic variants secreting phenotypically similar IgA half-molecules were derived directly from normal IgA-secreting myelomas.
    • Variant proteins showed improper assembly, distinct carboxy-terminal deletions, and aberrant heavy-light chain disulfide bonds.
    • Variable region serology and hapten affinity were unaffected in at least one variant.
    • DNA and mRNA analyses indicated normal fragment sizes, suggesting premature termination caused the deletions.

    Conclusions:

    • Somatic mutation in normal IgA-secreting myelomas can lead to the production of IgA half-molecules.
    • Premature termination is a likely mechanism for the observed carboxy-terminal deletions.
    • Findings provide insights into potential mutational hotspots and interdomain interactions in immunoglobulin gene expression.