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Related Experiment Videos

Hypothesis: a memory lymphocyte-specific soma-to-germline genetic feedback loop

H S Rothenfluh1

  • 1Division of Cell Biology, John Curtin School of Medical Research, Australian National University, Canberra.

Immunology and Cell Biology
|April 1, 1995
PubMed
Summary
This summary is machine-generated.

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New research reveals non-random DNA sequence patterns in vertebrate immunoglobulin variable (IgV) genes. A novel model suggests endogenous retroviruses facilitate gene transfer from soma to germline in the male reproductive tract.

Area of Science:

  • Immunogenetics
  • Evolutionary Biology
  • Molecular Genetics

Background:

  • Analysis of DNA sequence data for vertebrate germline immunoglobulin variable (IgV) genetic elements.
  • Observed extremely non-random patterns of sequence variability.
  • Patterns were also found in chicken IgV pseudogenes.

Purpose of the Study:

  • To present a new model explaining observed non-random sequence variability in IgV genes.
  • To account for patterns incompatible with existing multigene family evolution theories.
  • To propose a mechanism for soma-to-germline transfer of IgV genes.

Main Methods:

  • Analysis of published DNA sequence data.
  • Development of a modified soma-to-germline genetic vector model.

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  • Focus on endogenous retroviruses as potential vectors.

    • Main Results:

    • Identified extremely non-random patterns of sequence variability in vertebrate IgV genes.
    • Confirmed these patterns in chicken IgV pseudogenes.
    • Proposed a novel model extending existing theories.

    Conclusions:

    • The new model explains observed IgV gene patterns.
    • Soma-to-germline transfer of IgV genes may occur in the male reproductive tract via endogenous retroviruses.
    • The mechanism is restricted to memory lymphocytes and offers testable predictions.