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  • Title: A Novel Fibrinogen Mutation p.BβAla68Asp Causes an Inherited Dysfibrinogenemia.
    Author: Jia K, Zeng M, Zheng X, Xie H, Yang L, Xie Y, Wang M.
    Journal: Hamostaseologie; 2023 Dec; 43(6):426-431. PubMed ID: 37516116.
    Abstract:
    OBJECTIVE:  Our study aimed to analyze the phenotype and genotype of a pedigree with inherited dysfibrinogenemia, and preliminarily elucidate the probable pathogenesis. METHODS:  The one-stage clotting method was used to test the fibrinogen activity (FIB:C), whereas immunoturbidimetry was performed to quantify the fibrinogen antigen (FIB:Ag). Furthermore, DNA sequence analysis was conducted to confirm the site of mutation. Conservation analysis and protein model analysis were performed using online bioinformatics software. RESULTS:  The FIB:C and FIB:Ag of the proband were 1.28 and 2.20 g/L, respectively. Gene analysis revealed a heterozygous c.293C > A (p.BβAla68Asp) mutation in FGB. Bioinformatics and modeling analysis suggested that the missense mutation could potentially have a deleterious effect on fibrinogen. CONCLUSION:  The BβAla68Asp mutation in exon 2 of FGB may account for the reduced FIB:C levels observed in the pedigree. To our knowledge, this point mutation is the first report in the world.
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