PMID: 9681852Jul 29, 1998Paper

Association of multiple endocrine neoplasia type 2 and Hirschsprung disease

Journal of Internal Medicine
G RomeoG Martucciello

Abstract

In a few patients with Hirschsprung disease (HSCR) and no clinical symptoms of multiple endocrine neoplasia type 2 (MEN-2A) or medullary thyroid carcinoma (MTC), missense mutations in the cysteine residues 609 and 620 of the Ret gene have been identified. In several pedigrees with either MEN-2A or familial MTC (FMTC) a documented germline mutation in cysteine 618 or 620 follows the segregation of the disease phenotype. The appearance of the HSCR phenotype in such patients and pedigrees cannot be easily reconciled with the gain of function which is associated with the dominant oncogenic effect of MEN-2A mutations. Gastrointestinal manifestations are known to occur also in association with MEN-2B but, to the best of our knowledge, in only very few cases the intestinal phenotype of MEN-2B has been investigated by enzymo-histochemical techniques, as in the present work. We report an extensive molecular study of patients, two with HSCR and FMTC carrying a Cys620Arg or Ser mutation and two with MEN-2B and gastrointestinal symptoms carrying a Met918Thr mutation. One of the latter two patients showed aganglionosis of the last 5 cm of rectum which caused a congenital megacolon leading to the diagnosis and operation for HSCR. The mutatio...Continue Reading

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