Genetic analyses and expression studies identified a novel mutation (W486C) as a molecular basis of congenital coagulation factor XII deficiency

Keiko Ishii, Shuji Oguchi, Takanori Moriki, Yoko Yatabe, Eiko Takeshita, Mitsuru Murata, Yasuo Ikeda, Kiyoaki Watanabe

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We analyzed the factor XII (FXII) gene of a patient with congenital FXII deficiency and identified a novel amino acid substitution (W486C) in the catalytic domain. The proband was an asymptomatic 49-year-old Japanese female with abnormal coagulation test, discovered by chance. The FXII activity and antigen level were both under 10%, suggesting a cross-reacting material-negative FXII deficiency. Sequence analysis of the proband's FXII gene revealed a homozygous nucleotide substitution G → C in exon 12, resulting in the amino acid substitution W486C in the catalytic domain. We constructed the mutant FXII cDNA in an expression plasmid vector and transfected it into Chinese hamster ovary cells. The recombinant wild-type FXII antigen was detected in the culture medium by immunoprecipitation assay, but the mutant FXII (W486C) was not observed. On the other hand, both the wild-type FXII and W486C cell lysates contained FXII antigen and FXII mRNA, as estimated by western blotting and quantitative reverse transcriptase-polymerase chain reaction. These findings suggest that the W486C substitution of FXII impairs intracellular processing of the protein and/or transport system.

Original languageEnglish
Pages (from-to)367-373
Number of pages7
JournalBlood Coagulation and Fibrinolysis
Volume15
Issue number5
DOIs
Publication statusPublished - 2004 Jul 1

Keywords

  • Blood coagulation
  • Deficiency
  • Expression study
  • Factor XII
  • Genetics
  • Mutation

ASJC Scopus subject areas

  • Hematology

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