PMID: 7581377Aug 1, 1995Paper

Diversity of RET proto-oncogene mutations in familial and sporadic Hirschsprung disease

Human Molecular Genetics
T AttiéA Munnich

Abstract

Hirschsprung disease (HSCR) is a common congenital malformation (1 in 5,000 live births) due to the absence of autonomic ganglia in the terminal hindgut, and resulting in intestinal obstruction in neonates. Recently, a dominant gene for familial HSCR has been mapped to chromosome sub-band 10q11.2 and the disease has been ascribed to mutations in a tyrosine kinase receptor gene mapping to this region, the RET proto-oncogene. Studying the 20 exons of the RET gene by a combination of denaturating gradient gel electrophoresis and single strand conformation polymorphism in a large series of HSCR patients (45 sporadic cases and 35 familial forms), we found mutations of the RET gene in 50% of familial HSCR, regardless of the length of the aganglionic segment. The mean penetrance of the mutant allele in familial HSCR was significantly higher in males (72%) than in females (51%). Most interestingly, mutations at the RET locus accounted for at least 1/3 of sporadic HSCR in our series. These mutations were scattered along the length of the gene. Finally, among the mutations identified in sporadic cases (16/45), seven proved to be de novo mutations suggesting that new mutations at the RET locus significantly contribute to sporadic HSCR. Ta...Continue Reading

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