β-Catenin stabilization in skeletal muscles, but not in motor neurons, leads to aberrant motor innervation of the muscle during neuromuscular development in mice

► β-catenin stabilization in the skeletal muscle resulted in neonatal lethality. ► Mutant mice displayed abnormal innervation pattern. ► Formation and function of the NMJ was normal. ► β-catenin functions through non-cell autonomous mechanisms to regulate innervation pattern.