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Related Experiment Videos

Immunoglobulin J chain gene from the mouse.

L Matsuuchi, G M Cann, M E Koshland

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1986
    PubMed
    Summary

    Murine B lymphocytes activate the immunoglobulin J chain gene during primary immune responses. Its unique structure suggests chromatin changes initiate transcription, similar to light chain gene regulation.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • B lymphocytes express the immunoglobulin J chain gene during primary immune responses.
    • Understanding the induction mechanism of the J chain gene is crucial for B cell immunology.

    Purpose of the Study:

    • To identify and characterize the genomic DNA clones encoding the murine J chain.
    • To elucidate the structural properties and regulatory mechanisms of the J chain gene expression.

    Main Methods:

    • Obtained genomic DNA clones for the murine J chain from B lymphocyte cell lines.
    • Analyzed the coding regions and 5' flanking sequences of the J chain gene.
    • Compared J chain gene structure and promoter elements with other immunoglobulin genes.

    Main Results:

    • The J chain gene comprises four exons in a 7.3-kilobase transcription unit, distinct from other immunoglobulin genes.
    • No DNA rearrangement or alternative processing is required for J chain gene expression.
    • The promoter region contains conserved elements shared with lymphocyte-specific light chain genes.

    Conclusions:

    • J chain gene transcription is likely initiated by chromatin conformation changes, potentially involving a J chain-specific DNA-binding factor.
    • The J chain gene's transcriptional regulation may share similarities with light chain gene regulation mechanisms once activated.

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