Summary
We report the characterization of the genetic defect in a family with hereditary type-II protein C (PC) deficiency. The propositus is a 28-year-old woman with a history of thrombosis. Her PC activity level (58%) and PC antigen level (115%) are comptible with the diagnosis of type-II PC deficiency. Her asymptomatic sister is also PC deficient. Analysis of the PC gene of the propositus revealed a point mutation (G to A) at nucleotide 8856, which results in the replacement of Gly381 by Ser in the heavy chain of PC. The amino acid change occurs close to the active-site serine at a residue which is highly conserved among the serine proteases. The mutation is also present in the PC gene of the propositus' sister. Her brother, who is asymptomatic, has a normal genotype with respect to the mutation at nucleotide 8856.
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Wittmann, E., Walter, J., Pabinger-Fasching, I. et al. Symptomatic hereditary type-II protein C deficiency caused by a missense mutation in exon IX of the protein C gene (Gly381 to Ser). Ann Hematol 68, 255–259 (1994). https://doi.org/10.1007/BF01737427
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DOI: https://doi.org/10.1007/BF01737427