| Heterozygous TP53stop146/R72P fibroblasts from a Li-Fraumeni syndrome patient with impaired response to DNA damage. | |
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MedLine Citation:
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PMID: 20198344 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The Li-Fraumeni syndrome (LFS) is a rare autosomal dominant hereditary cancer syndrome, characterized by a wide spectrum of neoplasms, occurring in children and young adults. The identification of germline TP53 mutations in LFS has given rise to a number of in vitro studies using cultures of cancer cells and non-tumoral fibroblasts presenting germline TP53 mutations. In the present study, we performed a detailed documentation of the pedigree of an LFS family with a comprehensive analysis of genotype-phenotype correlations. We sequenced the TP53 gene and verified that the proband carries a germline nonsense mutation in codon 146 in one allele, the TP53Arg72Pro polymorphism in the second, and other intronic polymorphisms in the TP53 gene. In order to investigate the disruption of the p53 function in a patient presenting this mutation and the TP53Arg72Pro polymorphism who had so far suffered five malignant tumors and a benign meningioma, we tested her fibroblasts in response to DNA damage by evaluating the proliferation rate, apoptosis, and disruption of the TP53 pathway. The proband's heterozygous fibroblasts were not as efficient as control fibroblasts or those of her mother, who carried only the TP53Arg72Pro polymorphism, in causing cell arrest and cell death after DNA damage, which was correlated with diminished TP21 protein levels. |
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Authors:
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Juliana De Moura; Fl?via Ludimila Kavalec; Mabrouka Doghman; Roberto Rosati; Gislaine Custodio; Enzo Lalli; Glaci Moura D Cavallari; Jesus Santa Maria; Bonald C Figueiredo |
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Publication Detail:
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Type: Case Reports; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of oncology Volume: 36 ISSN: 1791-2423 ISO Abbreviation: Int. J. Oncol. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-03 Completed Date: 2010-06-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9306042 Medline TA: Int J Oncol Country: Greece |
Other Details:
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Languages: eng Pagination: 983-90 Citation Subset: IM |
Affiliation:
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Departamento de Patologia B?sica, UFPR, Brazil. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Antineoplastic Agents, Phytogenic / pharmacology Apoptosis Cell Cycle Cell Proliferation Cells, Cultured Codon, Nonsense* Codon, Terminator Cyclin-Dependent Kinase Inhibitor p21 / metabolism DNA Damage* Etoposide / pharmacology Female Fibroblasts / drug effects, metabolism*, pathology, radiation effects Genotype Germ-Line Mutation* Heterozygote Humans Li-Fraumeni Syndrome / genetics*, metabolism, pathology Male Middle Aged Pedigree Phenotype Polymorphism, Genetic Tumor Suppressor Protein p53 / genetics*, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Antineoplastic Agents, Phytogenic; 0/CDKN1A protein, human; 0/Codon, Nonsense; 0/Codon, Terminator; 0/Cyclin-Dependent Kinase Inhibitor p21; 0/TP53 protein, human; 0/Tumor Suppressor Protein p53; 33419-42-0/Etoposide |
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