Timp4 Conditional Knockout mouse models

Timp4, the mouse ortholog of human TIMP4, encodes the most restricted family member, expressed predominantly in heart, brain, adipose tissue, and platelets, where its N-terminal Cys1 wedge chelates the catalytic zinc of MMP1, MMP2, MMP7, MMP9, and MT1-MMP, and its C-terminal domain binds pro-MMP2 in a manner analogous to but weaker than TIMP2. Platelet-derived TIMP4 modulates aggregation and local matrix remodeling at sites of injury, and cardiac TIMP4 loss shifts the protease inhibitor balance during pressure overload and infarction, linking the gene to adverse remodeling rather than to developmental patterning. Nulls are viable and fertile with essentially normal baseline morphology, so germline deletion is a low-risk starting point but usually needs a stress challenge to reveal phenotype, while conditional alleles resolve cardiomyocyte versus fibroblast contributions and domain knockins separate inhibition from pro-MMP2 binding. Given clear redundancy with Timp1, Timp2, and Timp3, plan compound genetics around remodeling, infarct expansion, or adipose fibrosis endpoints.

Timp4 conditional knockout mice carry a floxed allele so you delete function only where Cre is active. The germline allele stays intact until you cross to a tissue specific Cre. Labs reach for this design when a global knockout is lethal, when they need adult onset loss, or when regional redundancy hides a whole body phenotype.