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- W4247100342 abstract "Bernard-Soulier syndrome is an uncommon bleeding disorder caused by a quantitative or qualitative defect in the platelet glycoprotein (GP)Ib/IX complex. The complex is composed of four subunits, GPIb, GPIbβ, GPIX, and GPV. Here we describe the molecular basis of a novel Bernard-Soulier syndrome variant in a patient in whom GPIb and GPIX were undetectable on the platelet surface. DNA sequence analysis showed normal sequence for GPIb, GPIX, and GPV. The GPIbβ gene has been mapped to the 22q11.2 region of chromosome 22 which was deleted from one chromosome of this patient. There was a single nucleotide deletion within the codon for Ala 80 in GPIbβ within the other allele. This mutation causes a translational frame shift that encodes for 86 altered amino acids and predicts a premature stop 15 amino acids short of the length of the wild-type protein. Transient coexpression of the mutant GPIbβ in 293T cells with wild-type GPIb and GPIX resulted in the surface expression of GPIb, but the absence of GPIX. Moreover, when a plasmid encoding the wild-type GPIbβ was transiently transfected into Chinese hamster ovary cells stably expressing GP, which retain the capacity to reexpress GPIX, there was a significant increase in the surface expression of GPIX. In contrast, when the mutant GPIbβ was transiently transfected into these cells, GPIX was not reexpressed on the plasma surface. Thus, a deletion of one copy of GPIbβ and a single nucleotide deletion in the codon for Ala 80 within the remaining GPIbβ allele causes the Bernard-Soulier phenotype through an interaction of GPIbβ with GPIX resulting in the absence of GPIb on the plasma membrane. The interaction of GPIbβ with GPIX is essential for the functional expression of GPIb." @default.
- W4247100342 created "2022-05-12" @default.
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- W4247100342 date "1999-05-01" @default.
- W4247100342 modified "2023-10-15" @default.
- W4247100342 title "The Critical Interaction of Glycoprotein (GP) Ibβ With GPIX—A Genetic Cause of Bernard-Soulier Syndrome" @default.
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- W4247100342 doi "https://doi.org/10.1182/blood.v93.9.2968.409a15_2968_2975" @default.
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