A Novel Polymorphism, 70Leu/Phe, Disrupts a Consensus Leu Residue within the Leucine-rich Repeat Sequence of Platelet Glycoprotein Ibα

Yumiko Matsubara; Mitsuru Murata; Takanori Moriki; Kenji Yokoyama; Naohide Watanabe; Hideaki Nakajima; Makoto Handa; Koichi Kawano; Nobuo Aoki; Hideaki Yoshino; Yasuo Ikeda

doi:10.1055/s-0037-1613098

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2002; 87(05): 867-872
DOI: 10.1055/s-0037-1613098

Review Article

Schattauer GmbH

A Novel Polymorphism, ⁷⁰Leu/Phe, Disrupts a Consensus Leu Residue within the Leucine-rich Repeat Sequence of Platelet Glycoprotein Ibα

Yumiko Matsubara

⁴Department of Medicine, School of Medicine, Keio University, Tokyo

,

Mitsuru Murata

⁴Department of Medicine, School of Medicine, Keio University, Tokyo

,

Takanori Moriki

¹Health Center, Keio University, Tokyo, Japan

,

Kenji Yokoyama

⁴Department of Medicine, School of Medicine, Keio University, Tokyo

,

Naohide Watanabe

⁴Department of Medicine, School of Medicine, Keio University, Tokyo

,

Hideaki Nakajima

²Blood Center, School of Medicine, Keio University, Tokyo, Japan

,

Makoto Handa

²Blood Center, School of Medicine, Keio University, Tokyo, Japan

,

Koichi Kawano

³Second Department of Internal Medicine, Kyorin University, Tokyo, Japan

,

Nobuo Aoki

³Second Department of Internal Medicine, Kyorin University, Tokyo, Japan

,

Hideaki Yoshino

³Second Department of Internal Medicine, Kyorin University, Tokyo, Japan

,

Yasuo Ikeda

⁴Department of Medicine, School of Medicine, Keio University, Tokyo

› Institutsangaben

Abstract

Summary

Platelet glycoprotein (GP) Ib/IX/V complex mediates high-shear dependent platelet activation through an interaction with the von Willebrand factor (vWF). All four subunits of the complex have a structural motif, the leucine-rich repeat (LRR) sequence, with leucines in conserved positions. Here we report a new polymorphism, Leu/Phe at residue 70 of GPIbα, which disrupts the consensus sequence of the LRR in the vWF binding domain. Genotype frequencies among 142 healthy Japanese subjects were 92.3%, 7.7%, and 0.0%, for the ⁷⁰Leu/Leu, ⁷⁰Leu/Phe, and ⁷⁰Phe/Phe genotypes, respectively.

Ristocetin-induced or shear-induced platelet aggregation was not significantly different between the ⁷⁰Leu/Leu and ⁷⁰Leu/Phe genotypes. In in vitro studies, a recombinant GPIbα fragment with ⁷⁰Phe (L70F) as compared to that with ⁷⁰Leu (WT) had low reactivity to anti-GPIbα monoclonal antibodies, GUR20-5 and Hip1, both of which recognize conformation-specific epitopes within the 45-kDa domain. Ristocetininduced ¹²⁵I-vWF binding to L70F, however, did not differ from that to WT.

Keywords

Polymorphism - platelets - glycoprotein Iba - leucine-rich repeat - genetics

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