An exceedingly rare genetic gastroenterological disease characterized by severe malabsorption diarrhea and a lack of intestinal enteroendocrine cells. Within the first weeks of life, patients present with vomiting, dehydration and severe diarrhea unresponsive to various nutrients and formulas and require home parenteral nutrition. The syndrome is also associated with type 1 diabetes during childhood. This phenotype is caused by loss-of-function mutations in the NEUROG3 gene, coding for neurogenin 3, a protein implicated in endocrine enteric and pancreatic cell development. [from
SNOMEDCT_US]