Human Molecular Genetics, Vol 5, 351-354, Copyright © 1996 by Oxford University Press
A Auricchio, G Casari, A Staiano and A Ballabio
Hirschsprung disease (HSCR), or aganglionic megacolon, is the most common
cause of congenital intestinal obstruction. Two different loci have been
found to be tightly linked to HSCR on chromosomes 10 and 13, respectively.
Recently, mutations in the RET protooncogene on chromosome 10q11.2 were
identified in several HSCR patients. In addition, a missense mutation in
the endothelin-B receptor (EDNRB) gene on chromosome 13q22 was found in an
inbred Mennonite kindred affected by HSCR and associated abnormalities,
demonstrating the involvement of EDNRB in HSCR pathogenesis. To test
whether mutations in the EDNRB gene could account for Hirschsprung in
patients from non-inbred populations, we analysed DNA samples from 17
probands of Italian origin with HSCR. We have identified two novel EDNRB
mutations: a missense mutation in a sporadic case, S305N, which leads to a
change of a serine to an asparagine, disrupting a putative phosphorylation
site; and a single nucleotide deletion in a familial case, N378I, resulting
in a truncated protein. Both mutations were found in one of the healthy
parents, and neither of these mutations were found in any of the normal
individuals tested. These data confirm the involvement of EDNRB in HSCR
pathogenesis and demonstrate that EDNRB mutations could contribute to HSCR
disease in non-inbred populations.
ARTICLES
Endothelin-B receptor mutations in patients with isolated Hirschsprung disease from a non-inbred population
Telethon Institute of Genetics and Medicine (Tigem), San Raffaele Biomedical Science Park, Milan, Italy.
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