Tgfbr1 Conditional Knockout mouse models

Tgfbr1 encodes ALK5, ortholog of human TGFBR1, a type I serine and threonine kinase receptor recruited into a heterotetramer by ligand-bound TGFBR2, which transphosphorylates the glycine and serine rich GS box; FKBP12 occupies that box in the basal state to prevent leaky activation, and once released the kinase phosphorylates SMAD2 and SMAD3 at their carboxy-terminal motifs while also engaging TRAF6, TAK1 and p38 for non-SMAD output. Heterozygous kinase domain mutations cause Loeys-Dietz syndrome with aortic aneurysm, so patient knockins address vascular biology that deletion does not. Germline deletion is embryonic lethal from yolk sac vasculogenesis failure, mandating conditional nulls for fibrosis, immune tolerance and tumor microenvironment studies, while a constitutively active T204D knockin driven from a lox-stop-lox cassette tests sufficiency. Because ALK1 and ALK2 transduce distinct ligand subsets, do not assume ALK5 loss removes all superfamily input from a tissue.

Conditional deletion of Tgfbr1 limits the genetic change to the lineage you choose. That helps in oncology, immunology, and metabolic work where systemic loss would muddy the read. After you confirm Cre specificity, crossing to Tgfbr1 floxed stock yields usable cohorts.