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Related Experiment Videos

Switch transcripts in immunoglobulin class switching

M Lorenz1, S Jung, A Radbruch

  • 1Institute for Genetics, University of Cologne, Germany.

Science (New York, N.Y.)
|March 24, 1995
PubMed
Summary
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B cells alter antibody class and function through gene segment exchange. Spliced switch transcripts, not just transcription, are sufficient to direct this class switching to IgG1 in mice.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B cells produce antibodies with diverse effector functions by altering immunoglobulin heavy chain gene segments.
  • Cytokines direct B cell class switching by inducing transcription of specific DNA sequences.

Purpose of the Study:

  • To investigate the role of spliced switch transcripts in directing immunoglobulin class switch recombination.
  • To determine if transcription alone is sufficient for targeted class switching.

Main Methods:

  • Utilized mutant mice with a heterologous human metallothionein IIA promoter to direct switch recombination.
  • Analyzed the induction and processing of switch transcripts.
  • Assessed the targeting of switch recombination to immunoglobulin G1 (IgG1).

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Main Results:

  • The heterologous promoter successfully directed switch recombination to IgG1.
  • Structurally conserved, spliced switch transcripts were induced.
  • Induction of these spliced transcripts was sufficient to target switch recombination to IgG1.

Conclusions:

  • Spliced switch transcripts play a crucial role in directing immunoglobulin class switch recombination to specific antibody classes.
  • Transcription of targeted DNA sequences alone is insufficient to direct class switching.