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• W1757887866 abstract "Microsatellite instability (MSI) has been observed within tumors and found to be closely associated with the degree of malignancy and prognosis in tumors. However, whether MSI in tumor-related genes can be induced by a chemical and whether a connection exists between MSI and tumors remain unclear. In the present study, we detected MSI in the tissues of N-methyl-N-nitrosourea (MNU) treated mice by targeting to 5, 29, 30 microsatellite loci in 3 mismatch repair (MMR) genes, 1 DNA repair gene, and 5 tumor suppressor (TS) genes, respectively. Among 26 mice survived in the MNU-group, 18 (69%) mice presented thymic lymphomas. Moreover, 61% (11/18) of the tumors metastasized to the other organs, including the liver, spleen, and kidney. We examined 104 tissues from MNU-treated mice using the 64 loci, and found 8 MSI events involved 4 loci in 4 tissues types. The MSI incidence in MMR, DNA repair, and TS genes was 67% (2/3), 0% (0/1) and 40% (2/5), respectively. MSI occurrence in tumor and non-tumor tissues was 5.6% (1/18) and 0% (0/8) and that in metastasis and non-metastasis tissues was 7.1% (1/14) and 9.4% (6/64), showing no significant difference. MSI loci in intronic regions of Atm, Msh6 and p21 and MSI in the 3′UTR of Pms2 were detected in MNU-treated mice. Specifically, we found a loss of heterozygosity in intron of Atm (ATM-8) in one metastasis mouse. Four similar events occurred in p21 gene intron (P21-1) of another non-metastasis mouse. Another MSI was a heterozygous mutation existed in an Msh6 allele (MSH6-2) in metastasis mouse. We also found a homozygous 2-bp insertion in the 3′UTR of Pms2 in two non-metastasis mice. These results imply that MNU can induce MSI in MMR and TS genes in C57BL/6J mice. MSI frequency does not seem to be associated with tumorigenesis or metastasis." @default.
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• W1757887866 date "2015-12-01" @default.
• W1757887866 modified "2023-10-17" @default.
• W1757887866 title "Microsatellite instability detected in tumor-related genes in C57BL/6J mice with thymic lymphoma induced by N -methyl- N -nitrosourea" @default.
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• W1757887866 doi "https://doi.org/10.1016/j.mrfmmm.2015.10.001" @default.
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