Genes associated with Hirschsprung’s disease
•Phox2b: Transcription factor expressed by the most primitive of the crest-derived cells that colonize the gut.
•Sox10:  Transcription factor: required early in development.
•Ret, its co-receptors, and ligands:  Receptor tyrosine kinase activated first by GDNF, and then NTN.
•EDN3 and EDNRB: collaborates with Ret and needed by non-crest-derived cells of colon
•SIF1:  Encodes Smad protein, involved in BMP signaling