当前位置： SCI文献检索 > THROMBOSIS RESEARCH期刊下所有文献 > Molecular characterization of 7 patients affected by dys- or hypo-dysfibrinogenemia: Identification of a novel mutation in the fibrinogen Bbeta chain causing a gain of glycosylation.

Molecular characterization of 7 patients affected by dys- or hypo-dysfibrinogenemia: Identification of a novel mutation in the fibrinogen Bbeta chain causing a gain of glycosylation.

Abstract：

:Fibrinogen is a hexameric glycoprotein consisting of two sets of three polypeptides (the Aα, Bβ, and γ chains, encoded by the three genes FGA, FGB, and FGG). It is involved in the final phase of the coagulation process, being the precursor of the fibrin monomers necessary for the formation of the hemostatic plug. Rare inherited fibrinogen disorders can manifest as quantitative deficiencies, qualitative defects, or both. In particular, dysfibrinogenemia and hypo-dysfibrinogenemia are characterized by reduced functional activity associated with normal or reduced antigen levels, and are usually determined by heterozygous mutations affecting any of the three fibrinogen genes. In this study, we investigated the genetic basis of dys- and hypo-dysfibrinogenemia in seven unrelated patients. Mutational screening disclosed six different variants, two of which novel (FGB-p.Asp185Asn and FGG-p.Asn230Lys). The molecular characterization of the FGG-p.Asn230Lys mutation, performed by transient expression experiments of the recombinant mutant protein, demonstrated that it induces an almost complete impairment in fibrinogen secretion, according to a molecular mechanism often associated with quantitative fibrinogen disorders. Conversely, the FGB-p.Asp185Asn variant was demonstrated to be a gain-of-glycosylation mutation leading to a hyperglycosylation of the Bβ chain, not affecting fibrinogen assembly and secretion. To our knowledge, this is the second gain-of-glycosylation mutation involving the FGB gene.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Asselta R,Robusto M,Platé M,Santoro C,Peyvandi F,Duga S

doi

10.1016/j.thromres.2015.05.007

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

168-74

issue

1

eissn

0049-3848

issn

1879-2472

pii

S0049-3848(15)00234-0

journal_volume

136

pub_type

杂志文章

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