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• W2103444619 endingPage "204" @default.
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• W2103444619 abstract "BRCA2 is a breast cancer susceptibility gene of which the product is thought to be involved in monitoring genome integrity and cell cycle progression. Brca2-null mice have a defect in embryonic cellular proliferation and die in utero. Here we report the generation of T-cell lineage-specific Brca2-deficient (tBrca2(-/-)) mice using the Cre-loxP system. Mice with a flanked by loxP allele of Brca2 were crossed to transgenic mice bearing Cre recombinase driven by the T cell-specific promoter Lck. Thymic cellularity and distribution of subset populations were normal in tBrca2(-/-) mutants. Thymocytes from tBrca2(-/-) mice underwent normal apoptosis in response to a variety of stimuli, and activated tBrca2(-/-) T cells had normal proliferative capacity. tBrca2(-/-) T cells were more likely than wild-type cells to undergo spontaneous apoptosis, but apoptosed normally in response to restimulation or DNA-damaging stress signals. Examination of metaphase spreads of tBrca2(-/-) T cells revealed that the chromosomes often exhibited aberrations such as breaks and tri-radial structures. The level of chromosomal abnormalities was enhanced in T cells from tBrca2(-/-); p53(-/-) double-mutant mice. However, tBrca2(-/-); p53(-/-) T cells did not show the enhanced level of spontaneous apoptosis demonstrated by tBrca2(-/-) T cells, a difference that likely accounts for an increase in cell number and (3)[H]thymidine incorporation of double-mutant T cells in culture compared with either single mutant. Despite this increased T-cell number, the onset of T-cell lymphomas was only marginally accelerated in tBrca2(-/-); p53(-/-) mice compared with p53(-/-) mice. Our results support a role for Brca2 in repairing spontaneous DNA lesions, and suggest that loss of Brca2 enhances the susceptibility of mouse T-lineage cells to chromosomal aberrations and deregulation of apoptosis in the absence of p53." @default.
• W2103444619 created "2016-06-24" @default.
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• W2103444619 date "2002-11-01" @default.
• W2103444619 modified "2023-09-27" @default.
• W2103444619 title "Loss of Brca2 and p53 synergistically promotes genomic instability and deregulation of T-cell apoptosis." @default.
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• W2103444619 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12414647" @default.
• W2103444619 hasPublicationYear "2002" @default.
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