Wnt2 Conditional Knockout mouse models

Wnt2 is the mouse ortholog of human WNT2 and encodes a canonical ligand of splanchnic mesenchyme that stabilizes beta-catenin through Frizzled with LRP6 in lung mesenchyme, where it specifies Nkx2-1 positive respiratory progenitors from foregut endoderm, and in placental and cardiac progenitor populations. The original null was recognized through placental vascular insufficiency with partial perinatal loss, while lung specification appears grossly intact on its own, which is the key design consideration. Mesenchyme-restricted conditional deletion using Dermo1-Cre or Tbx4 enhancer drivers addresses stage-specific requirements once placental confounding is removed, and humanized alleles support agonist and Porcupine inhibitor pharmacology. Redundancy here is not hypothetical, since Wnt2b is coexpressed in the same ventral foregut mesenchyme and only compound Wnt2 and Wnt2b nulls abolish lung specification and produce lung agenesis. Plan the double conditional and a validated mesenchymal driver from the start rather than after a disappointing single-locus result.

A floxed Wnt2 allele paired with Cre gives spatial control that whole body knockouts cannot offer. People use it to separate developmental roles from adult homeostasis, to model somatic mutations, and to match disease that begins in one organ.