Thromb Haemost 2000; 83(02): 239-243
DOI: 10.1055/s-0037-1613793
Rapid Communication
Schattauer GmbH

Severe Factor VII Deficiency Caused by a Novel Mutation His348 to Gln in the Catalytic Domain

Akira Katsumi3
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
,
Tadashi Matsushita
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
,
Tomio Yamazaki
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
,
Isamu Sugiura
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
,
Tetsuhito Kojima
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
,
Hidehiko Saito
1   From the First Department of Intern al Medicine, Nagoya University School of Medicine, Nagoya
2   Aichi Blood Disease Research Foundation, Nagoya, Japan
› Author Affiliations
This study was supported in part by the Grant-in Aid from the Ministry of Education, Science and Culture, and the Ministry of Health and Welfare, Japan
Further Information

Publication History

Received 12 May 1999

Accepted after resubmission 04 October 1999

Publication Date:
11 December 2017 (online)

Summary

Factor VII is a vitamin K-dependent zymogen that plays a key role in the initiation of the extrinsic pathway. A severe factor VII deficiency was identified in a 45-year old male whose plasma factor VII antigen was less than 60 ng/ml and expressed 5.2% of normal factor VII activity. DNA sequence analysis of the patient’s factor VII gene showed a thymidine to guanine transversion at nucleotide 10968 in exon VIII that results in a novel amino acid substitution of His348 to Gln. The patient was homozygous for this mutation, whereas some of his family members were heterozygous. Both wild type and mutant factor VII were transiently expressed in COS-1 cells. The level of secreted mutant factor VII antigen was only 11.0% of the level of wild type factor VII. In CHO cells stably transfected with the mutant factor VII, only 37.3% of the total labeled FVII was secreted into the conditioned media and the remainder was retained inside the cells. These data suggest this mutation leads to factor VII deficiency due to the impaired secretion of the molecule.

3 Present address: Dr. A. Katsumi, Howard Hughes Medical Institute Research Laboratories, Washington University School of Medicine, 660 South Euclid Avenue, Box 8022, St. Louis, MO 63110, USA.


 
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