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Related Experiment Videos

Primary structure of a deleted human lambda type immunoglobulin light chain containing carbohydrate: protein Sm

F A Garver, L Chang, J Mendicino

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1975
    PubMed
    Summary

    A human lambda immunoglobulin light chain (Sm lambda) exhibits an internal molecular deletion, resulting in a truncated variable region. This structural defect in plasma cell dyscrasia provides insights into immunoglobulin gene mutation susceptibility.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • Plasma cell dyscrasias can involve the synthesis of abnormal immunoglobulin molecules.
    • Immunoglobulin light chains (L) consist of variable (V) and constant (C) regions, encoded by distinct gene segments.

    Purpose of the Study:

    • To define the molecular deletion in the Sm lambda immunoglobulin light chain.
    • To investigate the structural consequences of this deletion and its implications for immunoglobulin gene organization and mutation.

    Main Methods:

    • Sequence analysis of the Sm lambda protein.
    • Isolation and characterization of the Sm protein from patient urine.
    • Comparison of the Sm lambda sequence to normal lambda chains.

    Main Results:

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    • An internal molecular deletion of 81 amino acid residues was identified in the variable (V) region of the Sm lambda polypeptide.
    • The constant (C) region remained intact, with synthesis resuming at residue 110.
    • Carbohydrate attachment occurred in the first hypervariable region, suggesting a common glycosylation site.

    Conclusions:

    • The deletion in Sm lambda is confined to the V-region, with intact C-region synthesis.
    • Susceptibility to breakage and reunion in specific immunoglobulin gene regions (e.g., V and C gene integration sites) is supported.
    • Somatic mutation in plasmacyte precursors is a potential mechanism for this genetic defect.