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Related Concept Videos

Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

2.1K
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
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Antibody Structure01:10

Antibody Structure

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Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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Antibody Structure01:10

Antibody Structure

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Antibody Structure and Classes01:25

Antibody Structure and Classes

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Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

6.8K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Emerging links between hypermutation of antibody genes and DNA polymerases.

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Third complementarity-determining region of mutated VH immunoglobulin genes contains shorter V, D, J, P, and N components than non-mutated genes.

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Related Experiment Video

Updated: Apr 22, 2026

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
15:07

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

Published on: December 28, 2015

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Generation of immunoglobulin variable gene diversity.

P J Gearhart

    Immunology Today
    |October 8, 2014
    PubMed
    Summary

    Diversity in immunoglobulin variable genes arises from multiple germline genes. These genes undergo somatic rearrangement and hypermutation, generating essential antibody diversity for the immune system.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • Immunoglobulin (IG) genes are crucial for adaptive immunity.
    • Antibody diversity is essential for recognizing a vast array of antigens.

    Purpose of the Study:

    • To elucidate the mechanisms generating diversity in immunoglobulin variable genes.
    • To understand the contribution of germline genes, somatic rearrangement, and hypermutation.

    Main Methods:

    • Analysis of recent protein and gene sequences.
    • Comparative genomics of immunoglobulin loci.

    Main Results:

    • Identified multiple germline gene segments contributing to immunoglobulin variable regions.
    • Demonstrated the role of somatic rearrangement in combining these segments.

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    Identification of Mouse and Human Antibody Repertoires by Next-Generation Sequencing
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    Generation of Recombinant Human IgG Monoclonal Antibodies from Immortalized Sorted B Cells
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    Generation of Recombinant Human IgG Monoclonal Antibodies from Immortalized Sorted B Cells

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    Related Experiment Videos

    Last Updated: Apr 22, 2026

    VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma
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    VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

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    Identification of Mouse and Human Antibody Repertoires by Next-Generation Sequencing
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    Generation of Recombinant Human IgG Monoclonal Antibodies from Immortalized Sorted B Cells

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  • Confirmed the impact of somatic hypermutation on refining antibody affinity and specificity.

    • Conclusions:

    • The combination of multiple germline genes, somatic rearrangement, and hypermutation is the primary driver of immunoglobulin variable gene diversity.
    • This multi-step process generates the extensive antibody repertoire necessary for effective immune responses.