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Wolfgang Miesbach: Factor VIII Aurora Redefines the Biology of Coagulation
Wolfgang Miesbach/LinkedIn
Aug 4, 2026, 07:01

Wolfgang Miesbach: Factor VIII Aurora Redefines the Biology of Coagulation

Wolfgang Miesbach, Professor of Medicine at Frankfurt University Hospital, shared a post on LinkedIn about a recent article by Johnathan J. Morris et al, published in American Society of Hematology, adding:

“Haemophilia A is defined by too little factor VIII.

So what happens when FVIII works too well?

Factor VIII Aurora (FVIII-R571S) — newly characterised in Blood by Lindsey George and colleagues at CHOP — is the first naturally occurring gain-of-function FVIII variant. It was identified in a patient with recurrent thrombosis and early death (NEJM 2025), and the mechanism turns out to be strikingly simple:

A single amino acid change raises the affinity of activated FVIII for FIXa by 10–20-fold. That one property accounts for the entire phenotype:

  • 6-fold higher one-stage activity, yet normal chromogenic activity — the CSA uses FIXa in excess and is blind to the difference
  • ‘APC resistance’ that isn’t intrinsic: the variant is cleaved by APC normally, but tighter FIXa binding shields it
  • reduced A2-domain dissociation
  • 4–5-fold greater haemostatic potency and a clearly prothrombotic phenotype in mice

The gene therapy parallel is hard to miss. Just as FIX-Padua (R338L) reshaped haemophilia B gene therapy, an enhanced-potency FVIII could do the same for haemophilia A — but FVIII carries a higher VTE risk than FIX, and Aurora is a sharp reminder of how narrow the safe expression window may be.”

Title: Factor VIII Aurora: A Naturally Occurring Gain of Function FVIII Variant with Enhanced FIXa Affinity

Authors: Johnathan J. Morris, Robert J Davidson, Connor T. Watson, Lindsey A. George

 

Wolfgang Miesbach: Factor VIII Aurora Redefines the Biology of Coagulation

Other posts featuring Wolfgang Miesbach on Hemostasis Today.

 

bleeding disorders Blood Connor T. Watson Health Hematology Hemophilia Hemostasis Hemostasis News Hemostasis Today Johnathan J. Morris Lindsey A. George Medicine Robert J. Davidson thrombosis Wolfgang Miesbach
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