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Alu-repeat-induced deletions within the NCF2 gene causing p67-phox-deficient chronic granulomatous disease (CGD)

Marcus Gentsch1, Aneta Kaczmarczyk, Karin van Leeuwen

  • 1Department of Pediatrics, University Hospital Carl Gustav Carus, Dresden, Germany.

Human Mutation
|December 3, 2009
PubMed

Insights

Chronic granulomatous disease (CGD) can result from a new Alu-induced deletion in the NCF2 gene. This genetic mutation causes a loss of function in the p67-phox protein, leading to CGD.

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Chronic granulomatous disease (CGD) is a primary immunodeficiency disorder.
  • CGD results from mutations affecting the phagocyte NADPH oxidase complex.
  • This complex is crucial for host defense against infections.

Purpose of the Study:

  • To investigate the genetic basis of CGD in consanguineous families.
  • To identify the specific mutation causing p67-phox deficiency in affected patients.
  • To elucidate the molecular mechanism underlying this novel form of CGD.

Main Methods:

  • Genomic DNA analysis to detect deletions.
  • cDNA sequencing to confirm exon deletions and assess protein structure.
  • Protein stability assays to determine intracellular half-life.
  • Functional assays of the NADPH oxidase complex.

Main Results:

  • Identified homozygous deletions of exon 5 in the NCF2 gene in five CGD patients.
  • Deletion resulted from Alu-mediated recombination.
  • The resulting p67-phox protein (p67Delta5) exhibited a 10-fold reduced half-life.
  • p67Delta5 failed to form a functional NADPH oxidase complex.
  • No dominant negative effect of p67Delta5 was observed.

Conclusions:

  • Alu-induced deletion of NCF2 exon 5 is a novel mechanism causing p67-phox-deficient CGD.
  • Loss of the TPR4 domain in p67-phox leads to protein instability and functional deficiency.
  • This finding expands the known genetic causes of chronic granulomatous disease.

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