WNT8A is a secreted signaling ligand that activates the canonical Wnt/β-catenin/TCF pathway through binding to frizzled family receptors 1. The protein contains 351 amino acids with conserved WNT family features including an N-terminal signal peptide, three N-linked glycosylation sites, and 22 conserved cysteine residues 12. WNT8A requires palmitoleation by PORCN and transport by the carrier protein Wntless (WLS) for proper secretion and signaling 3. During embryonic development, WNT8A plays crucial roles in axis specification and neural patterning, with FGF signaling regulating Wnt8a expression in the hindbrain during otic placode induction 4. The gene shows restricted expression patterns, being detected primarily in embryonal tumor cell lines like NT2 teratocarcinoma cells 15. WNT8A expression is downregulated by retinoic acid treatment during neuronal differentiation 5 but increases during neurite regrowth following brain injury, where enhancer-promoter interactions regulate its transcription 6. Disease relevance includes association with Hirschsprung's disease, where WNT8A polymorphisms correlate with disease risk and increased expression occurs in affected colon segments 7. The restricted expression pattern and potent β-catenin pathway activation suggest WNT8A functions primarily in early embryonic development and stem cell biology.