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Somatic hypermutation and B-cell lymphoma.

D Dunn-Walters1, C Thiede, B Alpen

  • 1Department of Histopathology, Guy's, King's and St Thomas' Medical School, London, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|February 24, 2001
PubMed
Summary
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Somatic hypermutation in B cells influences lymphoma development and prognosis. Analysis of mutations in MALT lymphomas suggests selection favors antibody structure conservation, not antigen selection.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • B-cell responses involve immunoglobulin gene mutation and selection for antigen affinity.
  • Somatic hypermutation analysis aids in classifying B-cell malignancies and predicting prognosis.
  • Subtypes of chronic lymphocytic leukemia and Burkitt's lymphoma show distinct mutation patterns.

Purpose of the Study:

  • To investigate mutation load and distribution in mucosa-associated lymphoid tissue (MALT) lymphomas.
  • To determine if selection pressures, particularly antigen selection, can be inferred from mutation patterns in MALT lymphomas.
  • To explore the role of somatic hypermutation in B-cell lymphoma pathogenesis.

Main Methods:

  • Analysis of immunoglobulin variable (IgV) gene mutations in MALT lymphomas.

Related Experiment Videos

  • Comparison of mutation patterns in MALT lymphomas with normal mucosal B cells and non-selected IgV genes.
  • Investigating mutation distribution in framework regions of V(H4) genes.

    • Main Results:

    • MALT lymphomas exhibit mutation loads similar to normal mucosal marginal zone B cells.
    • Selection was observed in framework regions of IgV genes in MALT lymphomas, favoring conservation of antibody structure.
    • No clear evidence of antigen selection was detected solely from sequence information.

    Conclusions:

    • Mutation analysis in MALT lymphomas supports their origin from mucosal marginal zone B cells with plasma cell differentiation.
    • Selection appears to conserve antibody structure rather than being driven by antigen specificity in these lymphomas.
    • Somatic hypermutation may contribute to lymphomagenesis through DNA damage and gene rearrangements.