Fig. 6. Activated Wnt/ß-catenin signaling in renal vesicle
progenitor cells in mice is sufficient to induce mesenchymal induction markers
in the absence of Wnt9b. (A-P) Whole-mount in situ hybridization at
E12.5. (A,E,I,M) HoxB7 and (B-D,F-H,J-L,N-P) the mesenchymal
induction markers (Fgf8, Wnt4 and Lhx1) on E12.5 embryonic
kidneys. The mesenchymal induction markers are not detected in kidneys from
Wnt9b mutants (F,G,H) and ectopically expressed when
Wnt/ß-catenin pathway is activated by Six2TGC (J,K,L). Six2TGC-mediated
activation of Wnt/ß-catenin pathway also causes ectopic expression of the
mesenchymal induction markers in Wnt9b mutants (N,O,P).