FUNCTIONAL CHARACTERIZATION OF HUMAN FACTOR VII BY MOLECULAR ANALYSIS OF INHERITED DYSFUNCTIONAL FACTOR VII VARIANT

1997 Fiscal Year Final Research Report Summary

• Project/Area Number: 08672637
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Laboratory medicine
• Research Institution: SHINSHU UNIV., SCHOOL OF ALLIED MRDICAL SCINENCES
• Principal Investigator: TAKAMIYA Osamu SHINSHU UNIV., SCHOOL OF ALLIED MEDICAL SCIENCES,PROF., 医療技術短期大学部, 教授 (50216785)
• Co-Investigator(Kenkyū-buntansha): FURIHATA Kenichi SHINSHU UNIV., MEDICAL SCHOOL,ASC/PROF., 医学部, 助教授 (80138007)
• Project Period (FY): 1996 – 1997
• Keywords: HUMAN COAGULATION FACTOR VII / INHERITED FACTOR VII DEFICIENCY / DYSFUNCTIONAL VARIANT / FACTOR VII COAGULANT ACTIVITY / SINGLE-STRAND CONFORMATIONAL POLYMORPHISM (SSCP) ANALYSIS / GENETIC RECOMBINATION

Research Abstract

1. Thirty cases from 12 unrelated families with inherited dysfunctional factor VII (FVII) were studies in order to investigate the function of factor VII.The probands from 2 families had a cross reactive material negative (CRM-) type deficiency, and the probands from 10 familie had a cross reactive material positive (CRM+) type deficiency.
2. SSCP analysis identified an aberrant mobility relative to the normal control in each to the CRM+ type, exon 2 ; one, exon 4 ; one, exon 5 ; one, exon8 ; 4 cases.
3. A case with an aberrant mobility in exon 4 was characterized by variable procoagulant activity using tissue factor from different sources. This case had G to A transition at nucleotide position 6055, which resulted in the substitution of Arg 79 by Gln in the 1st EGF-like domain, and was same case to our previous report (Biochem, 33 : 14162-14169,1994).
4. In 4 cases with an aberrant mobility in exon 8, the first case had C to T transition at nucleotide position 11514, which resulted in th e substitution of Thr359 by Met in the catalytic domain, and was same to the previous report (Blood, 89 : 5085,1997). The 2nd case had A to G transition at nucleotide position 11429, which resulted in the substitution of Gly331 by Ser, and was same to the previous report (Blood Coag Fibrionl, 7 : 93,1996). The 3rd case had C to T transition at nucleotide position 11267, which resulted in the substitution of Arg277 by Cys. The 4th case had T to G transition at nucleotide position 11487, which resulted in the substitution of His348 by Gln.
We prepared FVII cDNA by RT-PCR using RNA fron Hep G2 cell, in order to express each recombinant variant FVII.The wild-type FVII cDNA was inserted into the expression vector pEE14. CHO K1 cells were transfected. FVII : ag was detected in the medium by ELISA.After incuvated to add vitamin K into the medium, FVII : c was detected in the medium by APTT using FVII depleted plasma.
6. A single base change at each codon 331,271 and 260 are introducing into the wild-type FVII cDNA sequence by oligonucleotide in vitro site-directed mutagenesis.