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Related Experiment Videos

Decay-accelerating factor (CD55) deficiency phenotypes in Japanese

G L Daniels1, C A Green, G Mallinson

  • 1Bristol Institute for Transfusion Sciences, UK. geoff.daniels@msmail.nbs.nhs.uk

Transfusion Medicine (Oxford, England)
|July 24, 1998
PubMed
Summary

Rare inherited deficiencies in Decay-accelerating factor (DAF, CD55) were identified in Japanese individuals, revealing novel mutations impacting complement regulation and blood group antigen expression.

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Area of Science:

  • Immunology
  • Genetics
  • Hematology

Background:

  • Decay-accelerating factor (DAF, CD55) is a crucial complement regulatory protein.
  • DAF expresses Cromer-system blood group antigens on erythrocytes.
  • Inherited DAF deficiencies are exceptionally rare, with limited documented cases.

Observation:

  • Two distinct DAF-deficiency phenotypes, Inab and Dr(a-), were identified in Japanese subjects.
  • The Inab phenotype exhibited a complete absence of Cromer antigens and DAF binding.
  • The Dr(a-) phenotype showed significantly reduced Cromer antigens and DAF levels.

Findings:

  • The Inab propositus was homozygous for a previously identified DAF nonsense mutation (Trp53 stop codon).
  • The Dr(a-) individual possessed a mutation causing a Ser165Leu substitution in DAF.

Related Experiment Videos

  • Antibodies in Inab serum recognized all four DAF short consensus repeat domains.

    • Implications:

    • These findings elucidate the genetic basis of rare DAF-deficiency phenotypes.
    • Understanding these mutations enhances knowledge of complement regulation and blood group antigen complexities.
    • Further research can explore the clinical significance and potential therapeutic targets related to DAF function.