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RAG mutations in human B cell-negative SCID

K Schwarz1, G H Gauss, L Ludwig

  • 1Section of Molecular Biology, University of Ulm, D-89070 Ulm, Germany.

Science (New York, N.Y.)
|October 4, 1996
PubMed
Summary
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Mutations in the recombinase activating gene (RAG-1 or RAG-2) were identified in B- severe combined immunodeficiency (SCID) patients. This finding explains the cause of B- SCID by linking genetic recombination defects to the disease.

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Severe combined immunodeficiency (SCID) is classified into B+ SCID (with B lymphocytes) and B- SCID (without B lymphocytes).
  • The genetic causes for B+ SCID are known, but the etiology of B- SCID remains undefined.

Purpose of the Study:

  • To investigate the genetic basis of B- SCID.
  • To identify the molecular mechanisms underlying B- SCID.

Main Methods:

  • Genetic analysis of B- SCID patients.
  • Mutation screening of recombinase activating genes (RAG-1 and RAG-2).

Main Results:

  • Six out of 14 tested B- SCID patients harbored mutations in RAG-1, RAG-2, or both genes.
  • These mutations led to a functional inability to form antigen receptors via genetic recombination.

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Conclusions:

  • Defects in the RAG genes are a significant cause of B- SCID.
  • This study links defects in site-specific recombination systems to human disease, specifically B- SCID.