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SS Acharya, A Coughlin, DM Dimichele (2004 Feb)
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Hereditary factor V (FV) deficiency is a rare autosomal recessive bleeding disorder caused by F5 gene mutations. The objective of this study was to investigate the p.Phe218Ser and p.Gly304Glu variants found in 2 families with hereditary FV deficiency. The FV activity (FV:C) and FV antigen (FV:Ag) were measured by clotting and ELISA, respectively. The F5 gene and sequence conservation were analyzed by direct sequencing and ClustalX-2.1-win, respectively. One proband carried a homozygous p.Phe218Ser (c.653T>C) mutation, with FV:C and FV:Ag decreased to 11 and 14%, respectively. The other proband carried a heterozygous p.Gly304Glu (c.911G>A) mutation, with FV:C and FV:Ag reduced to 55 and 62%, respectively. Phe218 and Gly304 were highly conserved in the homologous gene in 9 other species. We hypothesized that the p.Phe218Ser and p.Gly304Glu variants are deleterious and responsible for the reduction in FV:C and FV:Ag.
Acta Haematologica – Karger
Published: Nov 1, 2021
Keywords: Bleeding disorder; F5; Factor V deficiency; Gene mutation
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