F7 Knockout mouse models

F7 encodes coagulation factor VII, the mouse ortholog of human F7 and the trigger protease of the extrinsic pathway. This vitamin K dependent zymogen combines a Gla domain, two EGF-like modules, and a trypsin-like catalytic domain, and a small circulating fraction already exists as factor VIIa that remains essentially inactive until it binds tissue factor exposed by vascular injury or expressed by tumor and myeloid cells; the tissue factor complex allosterically completes the factor VIIa active site, enabling cleavage of factors IX and X and initiation of thrombin generation, with tissue factor pathway inhibitor as the principal check. Complete deficiency permits normal embryogenesis but causes fatal perinatal hemorrhage, so hypomorphic low-expression alleles or conditional deletion with hepatocyte Cre are necessary for adult studies. Patient missense knockins suit factor VII deficiency and bypass therapy questions, while humanized F7 alleles are the correct platform for recombinant factor VIIa and tissue factor directed agent pharmacology.

Whole body loss of F7 gives the clearest readout when the question is whether the gene is required at all. Follow up tissue work can still move to a conditional allele if lethality or compensation appears.