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Related Experiment Videos

B-cell ontogeny in the chicken.

C E Grossi, P M Lydyard, M D Cooper

    Annales D'Immunologie
    |November 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Individual bursal stem cells generate diverse B lymphocytes through a programmed gene sequence, not random mutation. This suggests a genetic mechanism for V-region diversity preceding immunoglobulin class switching.

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    Area of Science:

    • Immunology
    • Developmental Biology
    • Genetics

    Background:

    • B lymphocytes are crucial for adaptive immunity.
    • The generation of B cell diversity is essential for recognizing a wide range of antigens.
    • Understanding the mechanisms of B cell development is key to immune system function.

    Purpose of the Study:

    • To investigate the mechanism by which bursal stem cells generate diverse B lymphocyte populations.
    • To test hypotheses regarding the programmed sequence of variable (V) region gene expression versus random mutation.
    • To elucidate the relationship between V-region diversity and immunoglobulin (Ig) class switching.

    Main Methods:

    • Analysis of B lymphocyte development from bursal stem cells.
    • Testing hypotheses through experimental manipulation and data consistency checks.

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  • Evaluating the roles of antigen exposure and somatic mutation in diversity generation.

    • Main Results:

    • Data strongly support a model where individual bursal stem cells produce multiple B cell clones via a preprogrammed V-region gene sequence.
    • Alternative hypotheses, such as single V-region gene expression per stem cell or random somatic mutation, were less consistent with the data.
    • Antigen exposure did not influence the pattern of clonotypic diversity, and somatic mutation appeared inefficient for systematic diversity generation.

    Conclusions:

    • The primary mechanism for V-region diversity in B lymphocytes involves an orderly genetic process of V-region gene pairing.
    • Immunoglobulin class diversity is secondarily expressed within B cell clones through sequential expression of constant heavy (CH) genes.
    • This programmed genetic mechanism ensures efficient and systematic generation of B cell receptor diversity.