PubMed:14699510 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/14699510","sourcedb":"PubMed","sourceid":"14699510","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/14699510","text":"PDGFRA germline mutation in a family with multiple cases of gastrointestinal stromal tumor.\nFamilial gastrointestinal stromal tumor (GIST) is a rare autosomal dominant genetic disorder associated with KIT germline mutations. In sporadic forms of the disease, somatic mutations target either KIT or PDGFRA genes. In a kindred in which 5 individuals had GIST, no germline mutation in KIT coding sequence has been detected. We hypothesized that the PDGFRA gene could be a predisposing gene in familial GIST. We sequenced PDGFRA exons 12 and 18 because several somatic mutations were identified within this region. We detected a germline PDGFRA missense mutation, 2675G \u003e T, resulting in a tyrosine substitution for the highly conserved aspartic acid at codon 846. This mutation showed perfect cosegregation with the GIST phenotype among the 7 family members tested. Interestingly, PDGFRA Asp846 is homologous to codon 820, which is located in the KIT tyrosine kinase II domain. In a previous study, a KIT germline Asp820Tyr mutation was detected in a Japanese kindred in which 6 individuals had GIST. Transfection of a KIT820Tyr complementary DNA in nude mice was found to be tumorigenic confirming the oncogenic potential of this mutation. The present study shows that PDGFRA is a second familial GIST predisposing gene. These results indicate a further example of involvement of structurally related genes in familial cancer 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