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Barozzi S, Pecci A, Marinoni M, Fontana G, Zanchetta ME, Noris P, Savoia A, Faleschini M. GP1BB c.179C > T is the most frequent cause of monoallelic Bernard-Soulier syndrome in the Italian population after the Bolzano variant: a report of two new families. Ann Hematol 2023; 102:677-679. [PMID: 36539614 DOI: 10.1007/s00277-022-05079-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 12/01/2022] [Indexed: 12/24/2022]
Affiliation(s)
- Serena Barozzi
- Medicina Generale 1, IRCCS Policlinico San Matteo Foundation, Pavia, Italy
| | - Alessandro Pecci
- Medicina Generale 1, IRCCS Policlinico San Matteo Foundation, Pavia, Italy.,Department of Internal Medicine, University of Pavia, Pavia, Italy
| | | | - Giorgia Fontana
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy
| | | | - Patrizia Noris
- Department of Internal Medicine, University of Pavia, Pavia, Italy
| | - Anna Savoia
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
| | - Michela Faleschini
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy
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Dib F, Quéméner A, Bayart S, Boisseau P, Babuty A, Trossaërt M, Sigaud M, Ternisien C, Drillaud N, Eveillard M, Guillet B, Béné MC, Fouassier M. Biological, clinical features and modelling of heterozygous variants of glycoprotein Ib platelet subunit alpha (GP1BA) and glycoprotein Ib platelet subunit beta (GP1BB) genes responsible for constitutional thrombocytopenia. Br J Haematol 2022; 199:744-753. [PMID: 36173017 DOI: 10.1111/bjh.18462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 08/29/2022] [Accepted: 08/31/2022] [Indexed: 11/28/2022]
Abstract
Constitutional thrombocytopenias are rare disorders, often difficult to discriminate from acquired thrombocytopenias. More than 80 genes have been described as being at the origin of these diseases. Among them, several variants of the glycoprotein Ib platelet subunit alpha (GP1BA) and glycoprotein Ib platelet subunit beta (GP1BB) genes, coding for the GpIb-IX-V glycoprotein complex, have been reported in the literature. The study reported here aimed at describing newly identified monoallelic anomalies affecting the GP1BA and GP1BB genes on a clinical, biological and molecular level. In a cohort of nine patients with macrothrombocytopenia, eight heterozygous variants of the GP1BA or GP1BB genes were identified. Five of them had never been described in the heterozygous state. Computer modelling disclosed structure/function relationships of these five variants.
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Affiliation(s)
- Fatema Dib
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France
| | - Agnès Quéméner
- Nantes Université, Inserm UMR 1307, CNRS UMR 6075, Université d'Angers, CRCI2NA, Nantes, France
| | | | - Pierre Boisseau
- Service de Génétique Médicale, CHU de Nantes, Nantes, France
| | - Antoine Babuty
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
| | - Marc Trossaërt
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
| | - Marianne Sigaud
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
| | - Catherine Ternisien
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
| | - Nicolas Drillaud
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
| | - Marion Eveillard
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,Nantes Université, Inserm UMR 1307, CNRS UMR 6075, Université d'Angers, CRCI2NA, Nantes, France
| | - Benoit Guillet
- CRC-MH, CHU de Rennes, Rennes, France.,Univ Rennes, CHU Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, France
| | - Marie C Béné
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,Nantes Université, Inserm UMR 1307, CNRS UMR 6075, Université d'Angers, CRCI2NA, Nantes, France
| | - Marc Fouassier
- Service d'Hématologie Biologique, CHU de Nantes, Nantes, France.,CRC-MH, CHU de Nantes, Nantes, France
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A Novel Mutation in GP1BB Reveals the Role of the Cytoplasmic Domain of GPIbβ in the Pathophysiology of Bernard-Soulier Syndrome and GPIb-IX Complex Assembly. Int J Mol Sci 2021; 22:ijms221910190. [PMID: 34638529 PMCID: PMC8508601 DOI: 10.3390/ijms221910190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/14/2021] [Accepted: 09/17/2021] [Indexed: 12/24/2022] Open
Abstract
Bernard-Soulier syndrome (BSS) is an autosomal-recessive bleeding disorder caused by biallelic variants in the GP1BA, GP1BB, and GP9 genes encoding the subunits GPIbα, GPIbβ, and GPIX of the GPIb-IX complex. Pathogenic variants usually affect the extracellular or transmembrane domains of the receptor subunits. We investigated a family with BSS caused by the homozygous c.528_550del (p.Arg177Serfs*124) variant in GP1BB, which is the first mutation ever identified that affects the cytoplasmic domain of GPIbβ. The loss of the intracytoplasmic tail of GPIbβ results in a mild form of BSS, characterized by only a moderate reduction of the GPIb-IX complex expression and mild or absent bleeding tendency. The variant induces a decrease of the total platelet expression of GPIbβ; however, all of the mutant subunit expressed in platelets is correctly assembled into the GPIb-IX complex in the plasma membrane, indicating that the cytoplasmic domain of GPIbβ is not involved in assembly and trafficking of the GPIb-IX receptor. Finally, the c.528_550del mutation exerts a dominant effect and causes mild macrothrombocytopenia in heterozygous individuals, as also demonstrated by the investigation of a second unrelated pedigree. The study of this novel GP1BB variant provides new information on pathophysiology of BSS and the assembly mechanisms of the GPIb-IX receptor.
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