A rare haplotype of the RET proto-oncogene is a risk-modifying allele in hirschsprung disease.
Hirschsprung disease (HSCR) is a common genetic disorder characterized by intestinal obstruction secondary to enteric aganglionosis. HSCR demonstrates a complex pattern of inheritance, with the RET proto-oncogene acting as a major gene and with several additional susceptibility loci related to the Ret-signaling pathway or to other developmental programs of neural crest cells. To test how the HSCR phenotype may be affected by the presence of genetic variants, we investigated the role of a single-nucleotide polymorphism (SNP), 2508C-->T (S836S), in exon 14 of the RET gene, characterized by low frequency among patients with HSCR and overrepresentation in individuals affected by sporadic medullary thyroid carcinoma. Typing of several different markers across the RET gene demonstrated that a whole conserved haplotype displayed anomalous distribution and nonrandom segregation in families with HSCR. We provide genetic evidence about a protective role of this low-penetrant haplotype in the pathogenesis of HSCR and demonstrate a possible functional effect linked to RET messenger RNA expression.
Griseri
Paola
P
Laboratorio di Genetica Molecolare, Istituto G. Gaslini, Genova, Italy.
Pesce
Barbara
B
Patrone
Giovanna
G
Osinga
Jan
J
Puppo
Francesca
F
Sancandi
Monica
M
Hofstra
Robert
R
Romeo
Giovanni
G
Ravazzolo
Roberto
R
Devoto
Marcella
M
Ceccherini
Isabella
I
D000483:Alleles; D029721:Drosophila Proteins; D015870:Gene Expression; D006239:Haplotypes; D006627:Hirschsprung Disease / Q000235:genetics*; D006801:Humans; D010375:Pedigree; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis / Q000235:genetics*; D051096:Proto-Oncogene Proteins c-ret; D012333:RNA, Messenger / Q000096:biosynthesis; D020794:Receptor Protein-Tyrosine Kinases / Q000096:biosynthesis / Q000235:genetics*
D029721:Drosophila Proteins; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases; C416649:Ret protein, Drosophila