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Related Experiment Videos

Immunoglobulin transgenes as targets for somatic hypermutation

U Storb1, A Peters, E Klotz

  • 1Department of Molecular Genetics and Cell Biology, University of Chicago, IL 60637, USA. stor@midway.uchicago.edu

The International Journal of Developmental Biology
|December 16, 1998
PubMed
Summary

Somatic hypermutation targets immunoglobulin genes via specific enhancers. A transcription-coupled model suggests a mutator factor interacts with RNA polymerase, with mutation rates influenced by RNA secondary structures.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Somatic hypermutation is crucial for adaptive immunity, generating antibody diversity.
  • Studies initiated in the mid-1980s utilized immunoglobulin (Ig) transgenes to investigate this mechanism.

Purpose of the Study:

  • To review and analyze studies on somatic hypermutation of immunoglobulin genes.
  • To elucidate the cis-acting elements and regulatory mechanisms governing somatic hypermutation.

Main Methods:

  • Experiments primarily used Ig transgenes as targets to study somatic mutation.
  • Analysis involved examining mutation patterns in variable and constant regions of Ig genes.
  • Investigated the role of Ig enhancers and promoters in directing somatic hypermutation.

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Main Results:

  • Ig transgenes are effective targets for somatic mutation, with essential cis-acting elements located within approximately 10 kb.
  • Mutation is restricted to Ig variable regions and proximate flanks, not the constant region in unmanipulated sequences.
  • Ig enhancers facilitate somatic mutation independently of their association with Ig promoters, suggesting gene specificity.

Conclusions:

  • Ig enhancers likely confer specificity to the somatic hypermutation process.
  • A transcription-coupled model is proposed, where a mutator factor interacts with RNA polymerase during transcription.
  • Nascent RNA secondary structure stability and mutator factor preferences influence mutation rates and specific nucleotide targets.