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Updated: Aug 10, 2026
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Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
Published on: November 1, 2011
Defect in IgV gene somatic hypermutation in common variable immuno-deficiency syndrome
1Unité d'immunologie clinique, Hôpital Henri Mondor, 51, avenue du Maréchal de Lattre de Tassigny, 94010 Créteil Cedex 10, France. yves.levy@hmn.hop-ap-paris.fr
Summary
Common Variable Immuno-Deficiency (CVID) is a common antibody deficiency. Some CVID patients show reduced antibody mutation, indicating an intrinsic B cell defect affecting antibody maturation.
Area of Science:
- Immunology
- Genetics
Background:
- Common Variable Immuno-Deficiency (CVID) is the most frequent symptomatic primary antibody-deficiency disorder.
- The underlying immunologic defects in CVID remain incompletely understood.
Purpose of the Study:
- To investigate the immunologic defects in patients with Common Variable Immuno-Deficiency (CVID) and hypogammaglobulinemia.
- To explore the role of Ig V gene somatic hypermutation in antibody affinity maturation in these patients.
Main Methods:
- Analysis of eight patients (six CVID, two hypogammaglobulinemic) with recurrent infections.
- Quantification of Ig V gene somatic hypermutation in IgG transcripts from memory B cells.
- Functional assays of the T cell compartment.
Main Results:
- Two CVID patients exhibited a significant reduction in Ig V gene somatic hypermutation.
- In these two patients, 40-75% of IgG transcripts lacked mutations in circulating memory B cells.
- Functional T cell assays suggested an intrinsic B cell defect in antibody affinity maturation.
Conclusions:
- An intrinsic B cell defect in antibody affinity maturation may underlie CVID in some patients.
- Reduced Ig V gene somatic hypermutation is a key feature in these CVID cases.
- Further research is needed to fully elucidate the immunologic basis of CVID.
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