Nigerian Journal of Clinical Practice

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Molecular characterization of exon 28 of von Willebrand’s factor gene in Nigerian population

ED Ezigbo, EO Ukaejiofo, TU Nwagha


Background: Polymorphisms in von Willebrand factor (VWF) gene are an important contributor to the expression of VWF gene and differences in ethnic distribution of these single nucleotide polymorphisms (SNPs) exists.
Aims: Our objective was to molecularly characterize the exon 28 of the VWF gene in the three major ethnic groups of Nigeria.
Subjects and Methods: We recruited 90 subjects, 45 had a history of bleeding. Questions included those used in the Zimmerman Program for the Molecular and Clinical Biology of von Willebrand disease (VWD), and the bleeding scores were calculated using the Molecular and Clinical Markers for the Diagnosis and Management of type 1 VWD scoring system. Full blood count, coagulation profile, VWF:antigen level and VWF:collagen‑binding activities were carried out. Data were analyzed using GraphPad Prism (5.03). GraphPad Software, Inc USA. The BigDye terminator chemistry was used to determine the nucleotide sequences of VWF gene (exon 28).
Results: Eight SNPs were identified, rs 216310 (T1547), rs 1800385 (V1565L), rs1800384 (A1515), rs1800383 (D1472H), rs 1800386 (Y1584C), rs 216311 (T1381A), rs 216312 (intronic) and rs 1800381 (P1337).
Conclusion: The SNPs rs 216311, rs 1800383 and rs 1800386 associated significantly with bleeding in study subjects. rs1800386 occurred in all with bleeding history, no ethnic variations were noted.

Key words: Exon 28, polymorphism, single nucleotide, von Willebrand factor

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