Analysis of the PTCH coding region in human rhabdomyosarcoma.
Inherited mutations of the human tumor suppressor gene Patched (PTCH) lead to an autosomal dominant disorder known as Nevoid Basal Cell Carcinoma Syndrome (NBCCS). The syndrome is characterized by a combination of developmental abnormalities and a predisposition to tumor formation. Tumors in patients with NBCCS include basal cell carcinoma, medulloblastoma, fibroma and rhabdomyosarcoma (RMS). RMS are also present in 15 % of mice haplodeficient for Ptch. To investigate whether mutations in PTCH are a general feature in rhabdomyosarcomagenesis we sequenced the protein-coding region in sporadic human cases of these tumors. For this purpose we first determined the distribution and frequency of polymorphisms in 23 exons of PTCH in 48 healthy caucasians. Ten new polymorphisms were identified (IVS11 + 15-17del AAA; IVS14 + 25T>C; 2485G>A; IVS15 + 9G>C; IVS17 + 21A>G; 3033T>C; 3149T>C; 3387T>C; 3617G>A; 4080C>T). Next, the PTCH coding region in 14 RMS was sequenced. Whereas one case with LOH at the PTCH locus was detected, none of the cases showed nonsense or missense mutations in the coding region of PTCH. These data do not support the existence of frequent mutations in the protein-coding region of PTCH in RMS.
Institute of Pathology, Technical University Munich, Munich Goettingen, Federal Republic of Germany.
Julia
J
Calzada-Wack
Udo
U
Schnitzbauer
Axel
A
Walch
Karl-Heinz
KH
Wurster
Roland
R
Kappler
Michaela
M
Nathrath
Heidi
H
Hahn
D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000737:chemistry / Q000235:genetics; D005091:Exons / Q000235:genetics*; D006801:Humans; D019656:Loss of Heterozygosity; D008565:Membrane Proteins / Q000235:genetics*; D009154:Mutation; D000072079:Patched Receptors; D000072081:Patched-1 Receptor; D011110:Polymorphism, Genetic; D011956:Receptors, Cell Surface; D012208:Rhabdomyosarcoma / Q000235:genetics*
D004273:DNA, Neoplasm; D008565:Membrane Proteins; C000606236:PTCH1 protein, human; D000072079:Patched Receptors; D000072081:Patched-1 Receptor; C000606240:Ptch1 protein, mouse; D011956:Receptors, Cell Surface