FV and APC resistance: the plot thickens.

Elisabetta Castoldi

Blood 2014 Apr 10

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In this issue of Blood, Nogami et al report on a novel factor V (FV) gene mutation (FV Trp1920→Arg, FVNara) associated with activated protein C (APC) resistance and a severe thrombotic phenotype in a young Japanese patient. Since the affected amino acid residue is located in the light chain of FV, far from the known APC-cleavage sites, this discovery may afford new insights into the molecular mechanisms of APC resistance.