A GP1BA Variant in a Czech Family with Monoallelic Bernard-Soulier Syndrome

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Authors

SKALNÍKOVÁ Magdalena STAŇO KOZUBÍK Kateřina TRIZULJAK Jakub VRZALOVÁ Zuzana RADOVÁ Lenka RÉBLOVÁ Kamila HOLBOVÁ Radka KURUCOVÁ Terézia SVOZILOVÁ Hana ŠTIKA Jiří BLAHÁKOVÁ Ivona DVOŘÁČKOVÁ Barbara PRUDKOVÁ Marie STEHLÍKOVÁ Olga ŠMÍDA Michal KŘEN Leoš SMEJKAL Petr POSPÍŠILOVÁ Šárka DOUBEK Michael

Year of publication 2022
Type Article in Periodical
Magazine / Source International Journal of Molecular Sciences
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://www.mdpi.com/1422-0067/23/2/885
Doi http://dx.doi.org/10.3390/ijms23020885
Keywords Bernard-Soulier syndrome; monoallelic; autosomal dominant; GP1BA; macrothrombocytopenia
Description Bernard-Soulier syndrome (BSS) is a rare inherited disorder characterized by unusually large platelets, low platelet count, and prolonged bleeding time. BSS is usually inherited in an autosomal recessive (AR) mode of inheritance due to a deficiency of the GPIb-IX-V complex also known as the von Willebrand factor (VWF) receptor. We investigated a family with macrothrombocytopenia, a mild bleeding tendency, slightly lowered platelet aggregation tests, and suspected autosomal dominant (AD) inheritance. We have detected a heterozygous GP1BA likely pathogenic variant, causing monoallelic BSS. A germline GP1BA gene variant (NM_000173:c.98G > A:p.C33Y), segregating with the macrothrombocytopenia, was detected by whole-exome sequencing. In silico analysis of the protein structure of the novel GPIb alpha variant revealed a potential structural defect, which could impact proper protein folding and subsequent binding to VWF. Flow cytometry, immunoblot, and electron microscopy demonstrated further differences between p.C33Y GP1BA carriers and healthy controls. Here, we provide a detailed insight into its clinical presentation and phenotype. Moreover, the here described case first presents an mBSS patient with two previous ischemic strokes.
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