Diverse phenotypic and genotypic presentation of RAG1 mutations in two cases with SCID


Karaca N. E. , Aksu G. , GENEL F., Gulez N., Can S., Aydinok Y., ...More

CLINICAL AND EXPERIMENTAL MEDICINE, vol.9, no.4, pp.339-342, 2009 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 9 Issue: 4
  • Publication Date: 2009
  • Doi Number: 10.1007/s10238-009-0053-1
  • Title of Journal : CLINICAL AND EXPERIMENTAL MEDICINE
  • Page Numbers: pp.339-342
  • Keywords: RAG1 mutations, CMV, Autoimmunity, Immunodeficiency, OMENN-SYNDROME, DEFECTS, LEADS

Abstract

Severe combined immunodeficiencies (SCID) comprise a spectrum of genetic defects that involve both humoral and cellular immunities. Defects in recombinating activating gene 1 (RAG1), RAG2, Artemis, or LIG4 can disrupt V(D)J recombination. Defective V(D)J recombination of the T and B cell receptors is responsible for T(-)B(-)NK(+)SCID. Amorphic mutations in RAG1 and RAG2 cause T(-)B(-)NK(+)SCID, whereas hypomorphic mutations cause an immunodeficency characterized by oligoclonal expansion of TCR gamma delta T cells, severe CMV infection and autoimmunity. First patient is a typical T(-)B(-)NK(+)SCID with clinical and immunologic findings while the second is atypical with normal immunoglobulin levels, CD4 lymphopenia, elevated TCR gamma delta T cells, persistent CMV infection, and autoimmune hemolytic anemia. These cases are presented to emphasize that mutations in RAG1 gene may lead to a diverse spectrum of clinical and immunologic findings while hypomorphic mutations may be related with autoimmunity and refractory CMV infection during infancy.