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2155 14068 Ensembl ENSG00000057593 ENSMUSG00000031443 UniProt P08709 P70375 RefSeq (mRNA) NM_000131 NM_001267554 NM_019616 NM_010172 RefSeq (protein) NP_000122 NP_001254483 NP_062562 NP_034302 Location (UCSC) Chr 13: 113.11 – 113.12 Mb Chr 8: 13.08 – 13.09 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Coagulation factor VII (EC 3.4.21.21, formerly known as proconvertin) is a ...
Factor VII deficiency is a bleeding disorder characterized by a lack in the production of Factor VII (FVII) (proconvertin), a protein that causes blood to clot in the coagulation cascade. After a trauma factor VII initiates the process of coagulation in conjunction with tissue factor (TF/factor III) in the extrinsic pathway.
However, factor VII has the shortest half-life of all the factors carboxylated by vitamin K; therefore, when deficient, it is the PT that rises first, since the activated Factor VII is the first to "disappear." In later stages of deficiency, the other factors (which have longer half-lives) can "catch up," and the PTT also rises.
Factor VII has a short half-life and the carboxylation of its glutamate residues requires vitamin K. The prothrombin time can be prolonged as a result of deficiencies in vitamin K, warfarin therapy, malabsorption , or lack of intestinal colonization by bacteria (such as in newborns ).
In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on. [7]
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The factor VIII protein has a half-life of 12 hours in the blood stream when stabilized by the von Willebrand factor. [ 20 ] No longer protected by vWF, activated FVIII is proteolytically inactivated in the process (most prominently by activated protein C and factor IXa ) and quickly cleared from the blood stream.
Factor V is produced by megakaryocytes, which produce platelets and platelet-derived factor V, and hepatocytes, which produce plasma-derived factor V. [9] The molecule circulates in plasma as a single-chain molecule with a plasma half-life of 12–36 hours. [10] Factor V is able to bind to activated platelets and is activated by thrombin.