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Molecular characterization of two novel mutations causing factor XI deficiency: A splicing defect and a missense mutation responsible for a CRM+ defect.

Abstract：

:Severe factor XI (FXI) deficiency is a bleeding disorder generally inherited as an autosomal recessive trait and characterized by haemorrhagic symptoms mainly associated with injury or surgery. So far, more than 150 causative molecular defects have been identified throughout the F11 gene. In the present study, we investigated the molecular basis of FXI deficiency in two Italian patients. Mutational screening of the F11 gene disclosed a novel missense substitution (Arg184Gly) in exon 7 and two splicing mutations: a novel G>A transition affecting the last nucleotide of exon 4 (325G>A), and the already known IVS6+3A>G. RT-PCR assays were performed on total RNA extracted from platelets and lymphocytes of each patient. Sequencing of RT-PCR products demonstrated that both 325G>A and IVS6+3A>G mutations abolish the corresponding donor splice site, causing the skipping of the affected exon; this in turn results in a frameshift introducing a premature termination codon. Expression of recombinant FXI-Arg184Gly revealed a 70% reduction in FXI activity, suggesting that the Arg184Gly mutation might cause a cross-reactive material positive (CRM+) deficiency. In conclusion, the functional consequences of two splicing mutations leading to FXI deficiency have been elucidated. Moreover, we report a novel missense mutation in the FIX-binding region of the FXI A3 domain leading to a CRM+ deficiency.

journal_name

Thromb Haemost

journal_title

Thrombosis and haemostasis

authors

Guella I,Soldà G,Spena S,Asselta R,Ghiotto R,Tenchini ML,Castaman G,Duga S

doi

10.1160/TH07-12-0723

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

523-30

issue

3

eissn

0340-6245

issn

2567-689X

pii

08030523

journal_volume

99

pub_type

杂志文章

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