PubMed · 7282767
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L M Larson. 1981. Hematology problem.. https://pubmed.ncbi.nlm.nih.gov/7282767/
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A total of 122 subjects, referred after presurgery screening or checkup for prolonged prothrombin time, were characterized for the presence of coagulation factor VII deficiency. Fourteen subjects carried a partial and asymptomatic deficiency, and in half of them dysfunctional molecules were detected in plasma. In nine subjects we found five missense mutations differing from those previously found in factor VII deficient patients. The others were homozygous for a common polymorphism (R353Q) that affects factor VII levels. A new codon dimorphism (A330) was also found in exon 8. Four mutations (R223W, M298I, R304Q, and R353Q) located at FVII-specific residues point out protein regions that are important for coagulation factor evolution, and two mutations (G342E and E265K) affect generic or partially generic residues. The newly reported mutations were combined with those we previously found, totalling 17 independent mutations responsible for FVII deficiency in 27 Italian pedigrees. We observed several similarities with the mutation pattern determined in factor IX, which include a high percentage of transitions at CpG doublets, the presence of hot spot sites affected by multiple substitutions, and of several topologically equivalent mutations.
Factor VII deficiency is a relatively infrequent hereditary bleeding disorder. Recombinant factor VIIa has been used to treat patients with factor VII deficiency with bleeding episodes or undergoing surgery. The drug has shown a high efficacy rate and will provide factor VII-deficient patients with a therapeutic agent that is not derived from human plasma.
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