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Related Experiment Videos

Inherited C3 deficiency of the complement system.

A S Grumach1, M M Vilela, C H Gonzalez

  • 1Instituto da Criança Prof. Pedro de Alcantara, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 1, 1988
PubMed
Summary

Complement component 3 (C3) deficiency in a homozygous patient led to severe bacterial infections. Heterozygotes showed normal health, suggesting co-dominant inheritance and S-allotype expression.

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Area of Science:

  • Immunology
  • Genetics

Background:

  • Complement component 3 (C3) is crucial for innate and adaptive immunity.
  • C3 deficiency can lead to increased susceptibility to infections.

Observation:

  • A patient homozygous for C3 deficiency experienced severe bacterial infections.
  • Heterozygotes in the same family remained clinically healthy.
  • The homozygous patient had undetectable C3 and very low CH50 levels.

Findings:

  • Serum opsonization capacity was reduced in the homozygous patient.
  • Lower-than-normal C3 levels in parents and relatives suggest co-dominant inheritance.
  • C3 polymorphism analysis indicated the expression of S-allotypes.

Implications:

Related Experiment Videos

  • This case highlights the critical role of C3 in immune defense.
  • Findings suggest a co-dominant inheritance pattern for C3 deficiency.
  • Understanding C3 allotypes may be important for assessing immune function.