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DiGeorge sequence with hypogammaglobulinemia: a case report.
Yin-Hsiu Chien1, Yao-Hsu Yang, Shau-Yin Chu
1Department of Pediatrics, National Taiwan University Hospital, Taipei, ROC.
Summary
DiGeorge sequence patients often have T-cell defects. This case shows reduced B-lymphocytes and hypogammaglobulinemia, highlighting the need to assess humoral immunity alongside cellular immunity in 22q11.2 deletion syndrome.
Area of Science:
- Immunology
- Genetics
- Pediatrics
Background:
- DiGeorge sequence (22q11.2 deletion syndrome) is primarily known for T-cell immunodeficiency due to thymic dysplasia.
- However, T-cells also regulate antibody production, suggesting potential humoral immune involvement.
Observation:
- A 4-month-old male infant presented with typical DiGeorge sequence features: facial dysmorphism, thymus dysplasia, tetralogy of Fallot, and a confirmed 22q11.2 deletion.
- The infant exhibited decreased B-lymphocyte counts and hypogammaglobulinemia.
Findings:
- Despite reduced B-cells and antibodies, the patient maintained normal T-lymphocyte function and adequate CD4+ T-cell numbers.
- This indicates a combined immunodeficiency rather than a purely cellular defect.
Implications:
- This case underscores the necessity of evaluating both cellular and humoral immune functions in infants diagnosed with DiGeorge sequence.
- Comprehensive immune assessment is crucial for accurate diagnosis and management of 22q11.2 deletion syndrome patients.