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Factor VIIShinjo: a dysfunctional factor VII variant homozygous for the substitution Gln for Arg at position 79.

Takamiya, O; Abe, S; Yoshioka, A; Nakajima, K; McVey, JH; Tuddenham, EG; (1995) Factor VIIShinjo: a dysfunctional factor VII variant homozygous for the substitution Gln for Arg at position 79. Haemostasis , 25 (3) pp. 89-97. 10.1159/000217147.

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Abstract

We report a factor VII (FVII) variant, FVIIShinjo, characterized by normal FVII antigen levels and variable procoagulant activity using tissue thromboplastin from different sources. Normal FVII activity is obtained using human placenta thromboplastin but low activity using rabbit or bovine brain thromboplastin. Exons 2-8 and the intron-exon junctions of the FVII genes of the propositus were amplified by PCR from DNA extracted from peripheral white blood cells, and screened by single-strand conformational polymorphism (SSCP) analysis. DNA fragments showing aberrant mobility were cloned and sequenced. We detected a single-point mutation, a homozygous G to A transition at nucleotide position 6,055 in exon 4, which results in the substitution of Arg 79 by Gln in the first EGF-like domain. This mutation results in a loss of a site for the restriction endonuclease MspI. The Msp I digestion pattern of the PCR-amplified exon 3+4 fragments from each member of the family was determined. The Msp I haplotypes were consistent with this G to A transition being associated with reduced FVII activity as detected using thromboplastins from various species. We conclude that the Arg 79 to Gln substitution in the first EGF-like domain of FVII identified in the propositus is responsible for the inherited FVII abnormality in this Japanese family. We postulate that one of the sites of interaction between FVII and tissue thromboplastin includes Arg 79 in the first EGF-like domain of factor VII.

Type: Article
Title: Factor VIIShinjo: a dysfunctional factor VII variant homozygous for the substitution Gln for Arg at position 79.
Location: Switzerland
DOI: 10.1159/000217147
Keywords: Base Sequence, Blood Coagulation Disorders, Blood Coagulation Tests, Chromosome Mapping, Factor VII, Female, Homozygote, Humans, Japan, Male, Middle Aged, Molecular Sequence Data, Pedigree, Point Mutation, Polymerase Chain Reaction, Polymorphism, Single-Stranded Conformational
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
URI: http://discovery.ucl.ac.uk/id/eprint/10036181
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