Omenn syndrome: a disorder of Rag1 and Rag2 genes

J Clin Immunol. 1999 Mar;19(2):87-97. doi: 10.1023/a:1020550432126.


In vertebrates, generation of the T- and B-cell repertoire relies on genomic rearrangement of T-cell receptor and immunoglobulin gene coding segments. This process, known as V(D)J recombination, is initiated by the lymphoid specific proteins Rag1 and Rag2. Both in humans and in animal models, mutations that abrogate expression of either the Rag1 or Rag2 proteins result in severe combined immune deficiency with a complete lack of circulating T and B cells due to an early block in lymphoid development. We have recently shown that mutations that impair, but do not completely abolish the function of Rag1 and Rag2 in humans result in Omenn syndrome, an enigmatic form of combined immune deficiency characterized by oligoclonal, activated T lymphocytes with a skewed Th2 profile.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Animals
  • Base Sequence
  • DNA-Binding Proteins / genetics*
  • DNA-Binding Proteins / physiology
  • Genes, RAG-1 / genetics*
  • Homeodomain Proteins / physiology
  • Humans
  • Molecular Sequence Data
  • Mutation
  • Nuclear Proteins
  • Recombination, Genetic*
  • Severe Combined Immunodeficiency / genetics*
  • Severe Combined Immunodeficiency / physiopathology


  • DNA-Binding Proteins
  • Homeodomain Proteins
  • Nuclear Proteins
  • RAG2 protein, human
  • V(D)J recombination activating protein 2
  • RAG-1 protein