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• W2113380083 startingPage "2234" @default.
• W2113380083 abstract "Using an improved system for the functional identification of active antisense fragments, we have isolated antisense fragments which inactivate the p53 tumour suppressor gene. These antisense fragments map in two small regions between nt 350 and 700 and nt 800 and 950 of the coding sequence. These antisense fragments appear to act by inhibition of p53 mRNA translation both in vivo and in vitro. Expression of these antisense fragments overcame the p53-induced growth arrest in a cell line which expresses a thermolabile mutant of p53 and extended the in vitro lifespan of primary mouse embryonic fibroblasts. Continued expression of the p53 antisense fragment contributed to immortalisation of primary mouse fibroblasts. Subsequent elimination of the antisense fragment in these immortalised cells led to restoration of p53 expression and growth arrest, indicating that immortal cells continuously require inactivation of p53. Expression of MDM2 or SV40 large T antigen, but not E7 nor oncogenic ras, overcomes the arrest induced by restoration of p53 expression. Functional inactivation of both p21 and bax (by overexpression of Bcl2), but not either alone, allowed some bypass of p53-induced growth arrest, indicating that multiple transcriptional targets of p53 may mediate its antiproliferative action. The ability to conditionally inactivate and subsequently restore normal gene function may be extremely valuable for genetic analysis of genes for which loss-of-function is involved in specific phenotypes." @default.
• W2113380083 created "2016-06-24" @default.
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• W2113380083 date "2000-06-01" @default.
• W2113380083 modified "2023-09-23" @default.
• W2113380083 title "Loss-of-function genetics in mammalian cells: the p53 tumor suppressor model" @default.
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• W2113380083 doi "https://doi.org/10.1093/nar/28.11.2234" @default.
• W2113380083 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/102629" @default.
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