Thrombophilia

Freed, Jason A.; Bauer, Kenneth A.

doi:10.1016/b978-0-323-46202-0.00014-5

Cited by 2 publications

(1 citation statement)

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“…In type IIa, mutations affect the reactive site, in type IIb, mutations affect the heparin-binding site and in type IIc, mutations show different defects in other parts of the protein [ 3 ]. Independent of its classification, AT deficiency, with a prevalence of 0.1–0.3% within the Caucasian population, poses a major risk for thromboembolic events [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

SERPINC1 c.1247dupC: a novel SERPINC1 gene mutation associated with familial thrombosis results in a secretion defect and quantitative antithrombin deficiency

Ruf,

Cunningham,

Wandersee

et al. 2024

Thrombosis J

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Background Antithrombin (AT) is an important anticoagulant in hemostasis. We describe here the characterization of a novel AT mutation associated with clinically relevant thrombosis. A pair of sisters with confirmed type I AT protein deficiency was genetically analyzed on suspicion of an inherited SERPINC1 mutation. A frameshift mutation, c.1247dupC, was identified and the effect of this mutation was examined on the cellular and molecular level. Methods Plasmids for the expression of wild-type (WT) and mutated SERPINC1 coding sequence (CDS) fused to green fluorescent protein (GFP) or hemagglutinin (HA) tag were transfected into HEK293T cells. Subcellular localization and secretion of the respective fusion proteins were analyzed by confocal laser scanning microscopy and Western blot. Results The c.1247dupC mutation results in a frameshift in the CDS of the SERPINC1 gene and a subsequently altered amino acid sequence (p.Ser417LysfsTer48). This alteration affects the C-terminus of the AT antigen and results in impaired secretion as confirmed by GFP- and HA-tagged mutant AT analyzed in HEK293T cells. Conclusion The p.Ser417LysfsTer48 mutation leads to impaired secretion, thus resulting in a quantitative AT deficiency. This is in line with the type I AT deficiency observed in the patients.

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Section: Introductionmentioning

confidence: 99%