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- W1998052259 abstract "Purpose: Familial adenomatous polyposis is characterized by the development of hundreds of adenomatous polyps located mainly in the colon and rectum. Patients with familial adenomatous polyposis who do not receive treatment will develop cancer before aged 40 years. This disease is caused by germline mutations in the adenomatous polyposis coli gene. Different studies have shown a correlation between the location of the mutation and the clinical phenotype, such as the grade of severity and/or the presence of extracolonic manifestations, such as desmoid tumors. This study was designed to identify germline mutation in the adenomatous polyposis coli gene in Chilean families with familial adenomatous polyposis. Methods: We examined the adenomatous polyposis coli gene in 24 Chilean families with familial adenomatous polyposis. The adenomatous polyposis coli gene was screened for mutations combining single strand conformation polymorphism technique, protein truncation test, and DNA sequencing. Results: We detected 17 different truncating mutations in 21 of 24 families (87.5 percent); 9 of these were novel. Fourteen mutations were detected in exon 15, being the most frequent c.3927_3931delAAAGA, found in 3 of 21 families (14 percent). Eight families (33 percent) showed at least one patient affected with desmoid tumors, presenting mutations between codons 849 and 1533. Interestingly, two mutations, c.3632dupA and c.3783_3784delTT, leading into a truncating protein at codons 1216 and 1274, were associated with almost 100 percent penetrance for desmoid tumors among relatives. Conclusions: We achieved 87 percent mutation detection rate in adenomatous polyposis coli gene; more than 50 percent of them were novel. The high percentage of novel mutations found may be because of the genetic composition of the Chilean population, which is an admixture of Amerindian and Spaniards, and the scarce information in the literature about similar populations." @default.
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- W1998052259 date "2007-12-01" @default.
- W1998052259 modified "2023-09-30" @default.
- W1998052259 title "Mutational Screening of the APC Gene in Chilean Families with Familial Adenomatous Polyposis: Nine Novel Truncating Mutations" @default.
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- W1998052259 doi "https://doi.org/10.1007/s10350-007-9044-z" @default.
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