EdnrB was deleted from the neural crest (EdnrBNCC-/-) resulting in mutants with defective NCC migration, distal colonic aganglionosis and the development of enterocolitis.
In contrast to S-HSCR, genetic variations in TCA aggregated to the important tyrosine kinase (intracellular) region in 5 patients suggesting a possible pathogenetic link.
To study the development of colonic aganglionosis we have utilized a novel knockout mouse (Ednrb(flex3/flex3)), in which the expression of a null Ednrb allele and YFP is confined to NCCs.