Expanding the Mutation Spectrum Affecting αIIbβ3 Integrin in Glanzmann Thrombasthenia: Screening of the ITGA2B and ITGB3 Genes in a Large International Cohort.

Nurden, Alan T; Pillois, Xavier; Fiore, Mathieu; Alessi, Marie-Christine; Bonduel, Mariana; Dreyfus, Marie; Goudemand, Jenny; Gruel, Yves; Benabdallah-Guerida, Schéhérazade; Latger-Cannard, Véronique; Négrier, Claude; Nugent, Diane; d'Oiron, Roseline; Rand, Margaret L; Sié, Pierre; Trossaert, Marc; Alberio, Lorenzo; Martins, Nathalie; Sirvain-Trukniewicz, Peggy; Couloux, Arnaud; ... (2015). Expanding the Mutation Spectrum Affecting αIIbβ3 Integrin in Glanzmann Thrombasthenia: Screening of the ITGA2B and ITGB3 Genes in a Large International Cohort. Human mutation, 36(5), pp. 548-561. Wiley-Blackwell 10.1002/humu.22776

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We report the largest international study on Glanzmann thrombasthenia (GT), an inherited bleeding disorder where defects of the ITGA2B and ITGB3 genes cause quantitative or qualitative defects of the αIIbβ3 integrin, a key mediator of platelet aggregation. Sequencing of the coding regions and splice sites of both genes in members of 76 affected families identified 78 genetic variants (55 novel) suspected to cause GT. Four large deletions or duplications were found by quantitative real-time PCR. Families with mutations in either gene were indistinguishable in terms of bleeding severity that varied even among siblings. Families were grouped into type I and the rarer type II or variant forms with residual αIIbβ3 expression. Variant forms helped identify genes encoding proteins mediating integrin activation. Splicing defects and stop codons were common for both ITGA2B and ITGB3 and essentially led to a reduced or absent αIIbβ3 expression; included was a heterozygous c.1440-13_c.1440-1del in intron 14 of ITGA2B causing exon skipping in 7 unrelated families. Molecular modeling revealed how many missense mutations induced subtle changes in αIIb and β3 domain structure across both subunits thereby interfering with integrin maturation and/or function. Our study extends knowledge of Glanzmann thrombasthenia and the pathophysiology of an integrin. This article is protected by copyright. All rights reserved.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Haematology and Central Haematological Laboratory

UniBE Contributor:

Alberio, Lorenzo

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1059-7794

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Verena Zwahlen

Date Deposited:

09 Apr 2015 09:55

Last Modified:

10 Sep 2017 12:05

Publisher DOI:

10.1002/humu.22776

PubMed ID:

25728920

Uncontrolled Keywords:

Glanzmann thrombasthenia, ITGA2B, ITGB3, integrin αIIbβ3, molecular modeling

BORIS DOI:

10.7892/boris.66112

URI:

https://boris.unibe.ch/id/eprint/66112

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