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- W2166545908 abstract "Hepatoblastomas (HBs) are embryonal tumors affecting young children and representing the most frequent malignant liver tumors in childhood. The molecular pathogenesis of HB is poorly understood. Although most cases are sporadic, the incidence is highly elevated in patients with familial adenomatous polyposis coli. These patients carry germline mutations of the APC tumor suppressor gene. APC controls the degradation of the oncogene product beta-catenin after its NH2-terminal phosphorylation on serine/threonine residues. APC, as well as beta-catenin, has been found to be a central effector of the growth promoting wingless signaling pathway in development. To find out if this pathway is involved in the pathogenesis of sporadic HBs, we examined 52 biopsies and three cell lines from sporadic HBs for mutations in the APC and beta-catenin genes. Using single-strand conformational polymorphism analysis, deletion screening by PCR, and direct sequencing, we found a high frequency of beta-catenin mutations in sporadic HBs (48%). The mutations affected exon 3 encoding the degradation targeting box of beta-catenin leading to accumulation of intracytoplasmic and nuclear beta-catenin protein. The high frequency of activating mutations in the beta-catenin gene indicates an important role in the pathogenesis of HB." @default.
- W2166545908 created "2016-06-24" @default.
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- W2166545908 date "1999-01-15" @default.
- W2166545908 modified "2023-10-12" @default.
- W2166545908 title "Childhood hepatoblastomas frequently carry a mutated degradation targeting box of the beta-catenin gene." @default.
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