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Related Experiment Videos

A familial factor XIII subunit B deficiency.

M Saito1, H Asakura, T Yoshida

  • 1Department of Internal Medicine (III), Kanazawa University School of Medicine, Japan.

British Journal of Haematology
|March 1, 1990
PubMed
Summary

This study identifies congenital factor XIII subunit B deficiency, a rare bleeding disorder. Subunit B appears crucial for stabilizing factor XIII subunit A in plasma.

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Area of Science:

  • Hematology
  • Molecular Biology
  • Genetics

Background:

  • Factor XIII (FXIII) is essential for hemostasis, cross-linking fibrin.
  • FXIII comprises catalytic A subunits and regulatory B subunits.
  • Deficiencies in FXIII activity lead to bleeding disorders.

Observation:

  • A patient presented with a bleeding tendency and consanguineous parentage.
  • Factor XIII activity was abnormally low, prompting family investigation.
  • The patient and her brother had undetectable FXIII subunit B; parents and children showed reduced levels.

Findings:

  • Congenital deficiency of factor XIII subunit B was identified.
  • Factor XIII subunit A protein was markedly decreased in the brother.
  • Subunit A exhibited a short plasma half-life (3 days) in the absence of subunit B, suggesting B stabilizes A.

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Implications:

  • This is the first report of factor XIII subunit B deficiency.
  • The disorder is likely inherited as an autosomal recessive trait.
  • FXIII subunit B plays a critical role in stabilizing FXIII subunit A in circulation.