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Nonsense-codon-mediated decay in human hereditary complement C3 deficiency.

Edimara S Reis1, Victor Nudelman, Lourdes Isaac

  • 1Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av Prof Lineu Prestes 1730, CEP 05508-900, São Paulo, SP, Brazil.

Immunogenetics
|November 26, 2003
PubMed
Summary
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Complement component 3 (C3) deficiency in a Brazilian boy was linked to a premature termination codon, causing truncated protein production and mRNA instability. This prevents C3 protein in serum, leading to recurrent infections.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Complement component 3 (C3) is crucial for immune responses, mediating opsonization and anaphylotoxin production.
  • C3 deficiency is a rare autosomal recessive disorder linked to recurrent infections and immune complex diseases.

Observation:

  • A Brazilian boy with consanguineous parents presented with recurrent bacterial infections and C3 deficiency.
  • Analysis of C3 mRNA in the patient's fibroblasts revealed no large structural gene aberrations.

Findings:

  • Sequencing identified an R848STer substitution, creating a premature termination codon and resulting in a truncated C3 protein.
  • Lower C3 mRNA levels in fibroblasts suggest inherent mRNA instability, consistent with nonsense-codon-mediated decay.
  • The premature termination codon leads to accelerated C3 mRNA decay and a lack of C3 protein in serum.

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Implications:

  • The identified genetic defect explains the patient's C3 deficiency and associated recurrent infections.
  • Nonsense-codon-mediated decay prevents the accumulation of potentially toxic truncated C3 proteins.
  • Understanding C3 deficiency mechanisms aids in diagnosing and managing complement-related immune disorders.