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Related Experiment Videos

Function and control of recombination-activating gene activity.

F W Alt1, G Rathbun, E Oltz

  • 1Howard Hughes Medical Institute, Children's Hospital, Boston, Massachusetts.

Annals of the New York Academy of Sciences
|May 4, 1992
PubMed
Summary
This summary is machine-generated.

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Recombination-activating genes (RAG-1 and RAG-2) are essential for lymphocyte development. RAG-2 deficient mice exhibit severe combined immune deficiency, confirming RAG genes

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • The RAG-1 and RAG-2 genes are known to confer VDJ recombinase activity.
  • Their precise role in lymphocyte development and VDJ recombination has been investigated.

Purpose of the Study:

  • To unequivocally test the function of RAG genes in vivo.
  • To investigate the necessity of RAG-2 for lymphocyte development and VDJ recombination.
  • To establish reliable cell models for studying VDJ recombination mechanisms.

Main Methods:

  • Generation of RAG-deficient mouse lines.
  • Analysis of immune cell populations and VDJ recombination initiation in RAG-deficient mice.
  • Engineering B-lineage cell lines with heat shock-inducible RAG genes.

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Main Results:

  • RAG-2 deficient mice are viable but display severe combined immune deficiency due to a lack of mature lymphocytes.
  • RAG-2 deficiency specifically impacts lymphocyte development without affecting other tissues.
  • RAG gene expression levels correlate with VDJ recombination activity, with higher levels in primary lymphoid tissues compared to cell lines.
  • Inducible RAG expression in engineered cell lines leads to transient, high-level VDJ recombinase activity and efficient substrate rearrangement.

Conclusions:

  • RAG-1 and RAG-2 are critical and specific components for VDJ recombination and lymphocyte development.
  • RAG-deficient mice serve as a model for severe combined immune deficiency.
  • Engineered cell lines with inducible RAG expression provide a reliable system for studying VDJ recombination mechanisms.