Journal List > Korean J Lab Med > v.27(3) > 1011387

Song, Choi, and Song: Investigation of von Willebrand Factor Gene Mutations in Korean von Willebrand Disease Patients

Abstract

Background

We intended to find the mutations of von Willebrand factor (VWF) gene as the most important contributing factor of von Willebrand disease (VWD) in Korean patients.

Methods

In 40 known vWD patients mutations of vWF gene were sought by direct sequencing of PCR products targeting exons 18, 19, 20, 26, 28 and 52 frequently implicated as the locations of mutation. For factors other than VWF gene contributing to VWD phenotype, we tested ABO blood group and measured ADAMTS13 activity in VWD patients.

Results

Twenty-seven cases (67.5%) were type 1 vWD, 3 cases (7.5%) type 3, and 5 cases (12.5 %) type 2A. Three cases were type 2A or 2B (7.5%) and 2 cases were suspected to be type 2N (5.0 %). Among them six candidate missense mutations were found: V1279I, R1306W, R1308C, and V1316M were previously reported in type 2B and type 1 vWD, and C858W and T1477I were novel findings. All patients were heterozygotes. Blood group O was overly represented in VWD patients, while ADAMTS13 activity of the patients was not significantly different from that of normal control.

Conclusions

Mutation of VWF gene detected by genetic studies can significantly improve the diagnostic accuracy, especially in subtype assignment of VWD. Two novel mutations, C858W and T1477I associated with VWD were found and expected to contribute to the elucidation of its patho-physiology.

References

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Fig. 1.
The probable role of the novel findings C858W and T1477I in causing VWD. The C858W segregated with decreased VWF activity within the family of the patient 37, while mildly decreased VWF: Ag was observed in all members of the family (A). The residues 858C and 1477T (indicated by asterisk) within VWF are more strictly preserved throughout several different mammalian species than other immediate neighboring residues, implying its essentiality for wholeness of VWF in regard to its synthesis, stability or function (B, C).
kjlm-27-169f1.tif
Fig. 2.
ADAMTS13 activity in VWD patients compared with normal controls. There was no significant difference between ADAMTS13 activity between VWD patients (n=38) and normal healthy control (n=38).
kjlm-27-169f2.tif
Table 1.
Number of each subtype among the VWD patients included and positive results of the mutation screening
Classification Subtype N of cases (%) N of mutations detected (% of cases)
Type 1   27 (67.5) 3 (11.1)
Type 2 2A 5 (12.5) 0 (0.0)
  2A or 2B 3 (7.5) 3 (100.0)
  2N 2 (5.0) 0 (0.0)
Type 3   3 (7.5) 0 (0.0)
Total   40 6
Table 2.
Laboratory data of the patients for whom candidate implicated mutations of VWF gene were found and past reports of each mutation
Patient No. vWF:Ag (%) vWF activity (%) FVIII:C (%) Activity/Ag ratio Multimer analysis Amino acid substitution (nucleotide substitution) Domain Past reports
2 16 13 19 0.8 Type 1 V1279I (3835 G>A) Domain A1 Eikenboom et al. (1993)
4 30 11 27 0.4 Type 2A or 2B R1306W (3916 C>T) Domain A1 Cooney et al. (1991)
20 42 10   0.1 Type 2A or 2B R1308C (3922 C>T) Domain A1 Cooney et al. (1991)
35 74 17 0.2 Type 2A or 2B V1316M (3946 G>A) Domain A1 Cooney et al. (1991)
36 42 37 0.9 T1477I (4430 C>T) Domain A1
37 35 22 5 0.7 Type 1 C858W (2574 C>G) Domain D'
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