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Year : 2018  |  Volume : 43  |  Issue : 4  |  Page : 206-211

von Willbrand factor Thr789Ala gene variant determines the type of myocardial ischemia in Egyptian patients

1 Department of Clinical Pathology, Menoufia University, Shebin Elkom, Egypt
2 Department of Cardiology, Menoufia University, Shebin Elkom, Egypt

Correspondence Address:
Nahla F Osman
Department of Clinical Pathology, Faculty of Medicine, Menoufia University, Shebin Elkom
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ejh.ejh_8_17

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Objective von Willbrand factor antigen level (vWF: Ag) was shown to contribute to the risk of cardiovascular disease. vWF Thr789Ala single nucleotide polymorphism was thought to affect the factor level and function. This study aimed to investigate the impact of genetic variants at that position on the risk of acute coronary syndrome (ACS). Patients and methods The study included 112 patients of ACS; 31 with unstable angina (UA) and 81 with myocardial infarction (MI) as well as 118 healthy controls. vWF: Ag level was measured by enzyme-linked immunosorbent assay. The gene analysis was carried out by PCR using restriction fragment length polymorphism principles. Results vWF: Ag levels were significantly higher in patients (111.29±24.43 IU/dl) compared to the controls (71.13±13.72 IU/dl, P<0.001). The majority of patients with UA (80.6%) were Ala789 homozygous, 6.5% were Thr789Ala heterozygous, and 12.9% were Thr789 homozygous. With respect to the MI group, Ala789 genotype was present in 34.6% of the patients, Thr789Ala genotype was the predominant genotype and was seen in 48.1% of the patients, and Thr789 homozygous was present in 17.3% of the patients. The genotype frequency in the control group was as follow; 47.4% were Ala789 homozygous, 33.1% were heterozygous, and 19.5% were Thr789 homozygous. The difference in genotype distribution was significantly different among the three groups (P<0.001), and between the groups with UA and MI (P<0.001). Ala789 homozygous genotype was an independent risk factor for UA while the Thr789Ala genotype was shown as an independent risk factor of MI. Conclusion vWF Thr789Ala polymorphism is an independent risk factor for ACS and has significant impact on the type of myocardial ischemia. It should be incorporated in the risk assessment model to identify and guide the management in these patients.

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