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Type III bare lymphocyte syndrome associated with a novel RFXAP mutation: a case report.

B Gokturk1, H Artac, M J van Eggermond

  • 1Department of Pediatric Allergy and Immunology, Konya University Meram Medical Faculty, Konya, Turkey. gokturkbahar@yahoo.com

International Journal of Immunogenetics
|March 7, 2012
PubMed
Summary

Type III bare lymphocyte syndrome (BLS) is a severe combined immunodeficiency. A novel mutation in the RFXAP gene caused a premature stop codon, leading to lack of MHC Class II expression in a BLS patient.

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Type III bare lymphocyte syndrome (BLS) is a severe combined immunodeficiency characterized by absent MHC Class II expression.
  • MHC Class II deficiency impairs adaptive immune responses, leading to recurrent infections.

Observation:

  • A patient with type III BLS presented with absent MHC Class II and low MHC Class I expression.
  • Genetic analysis revealed a novel mutation in the RFXAP gene.

Findings:

  • The identified mutation introduced a premature stop codon in the DE-region of RFXAP at amino acid 73.
  • This mutation resulted in the complete absence of Regulatory Factor X-Associated Protein (RFXAP) expression.

Implications:

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  • This finding elucidates a novel genetic cause for Type III BLS.
  • Understanding the role of RFXAP mutations deepens insights into MHC Class II regulation and immune deficiency.
  • This case highlights the importance of RFXAP in MHC Class II pathway functioning.