Analysis of a pedigree affected with congenital dysfibrinogenemia due to a novel Gly31Glu mutation of FGA gene
10.3760/cma.j.issn.1003-9406.2019.09.012
- VernacularTitle: 纤维蛋白原Αα链Gly31Glu突变导致的遗传性异常纤维蛋白原血症的家系分析
- Author:
Xiaoou WANG
1
;
Xiao YANG
;
Wei YANG
;
Kuangyi SHU
;
Fanfan LI
;
Jie LIU
;
Zhaohua ZHANG
;
Shanshan LI
;
Minghua JIANG
Author Information
1. Center of Laboratory Medicine, the Second Affiliated Hospital of Wenzhou Medical University, Yuying Children’s Hospital, Wenzhou, Zhejiang 325027, China
- Publication Type:Clinical Trail
- Keywords:
Dysfibrinogenemia;
Thrombin time;
Fibrinogen;
Gene mutation
- From:
Chinese Journal of Medical Genetics
2019;36(9):901-904
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To analyze the phenotype and genotype of a pedigree affected with congenital dysfibrinogenemia.
Methods:Liver and kidney functions of the proband and her relatives were determined. Coagulation tests including prothrombin time (PT), activated partial thromboplastin time (APTT) and thrombin time(TT), fibrin(ogen) degradation products (FDPs), D-dimer(D-D) and the calibration experiment of protamine sulfate of against plasma TT were detected in the proband and her predigree members. The activity and antigen of fibrinogen (Fg) in plasma were measured by Clauss method and immunonephelometry method, respectively. All of the exons and exons-intron boundaries of the three fibrinogen genes (FGA, FGB and FGG) were subjected to PCR amplification and Sanger sequencing. Potential influence of the suspected mutations were analyzed with bioinformatics software including PolyPhen-2, SIFT and Mutation Taster.
Results:The proband had normal PT, APTT, FDPs, D-D and prolonged TT (31.8 s). The activity of fibrinogen (Fg) in plasma was significantly decreased but the antigen was normal. Genetic analysis revealed a heterozygous c. 92G>A (p.Gly31Glu) mutation in exon 2 of the FGA gene. Family studies revealed that the mother carried the same mutation. Bioinformatic analysis suggested that the mutation may affect the function of Fg Protein.
Conclusion:The dysfibrinogenemia was probably caused by the novel Gly31Glu mutation of the FGA gene.
