Abstract
Mutations in DNA mismatch repair (MMR) genes in hereditary non-polyposis colon cancer (HNPCC) patients revealed the importance of MMR deficiency as a risk for carcinogenesis. Since diverse mutations occur in several MMR genes, the instability of repeat sequences dispersed in the genome, which are also governed by the MMR system, is a well used marker. However, the relationship between repeat sequence instability and MMR gene mutation in human cells has not been well defined mainly because precise systems to analyse repeat sequences have not been available. Using our newly developed system, we analysed alteration of dinucleotide repeats in human cell lines which harbour mutations in MMR genes. Among 24 subclones of DLD-1 cells (hMSH6−) only one had a dinucleotide repeat alteration in only one microsatellite locus, while LoVo cells (hMSH2−/hMSH6−) exhibited marked dinucleotide repeat instability (DRI). HCT116 cells, a hMLH1-mutant, showed an ultimate DRI phenotype. Interestingly, SW48 cells lacking hMLH1 expression also demonstrated DRI, albeit the extent of diversity being significantly lower than HCT116. These data suggest that the DRI phenotype in human cells is highly dependent on mutated MMR genes and on forms of mutation. The results of DRI analyses used to detect MMR-deficiency should be interpreted with caution.
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Acknowledgements
We are most grateful to M Sekiguchi for helpful advice and to M Ohara for comments on the manuscript. This study was supported by grants from the Ministry of Education, Science, Sports and Culture of Japan.
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Oki, E., Oda, S., Maehara, Y. et al. Mutated gene-specific phenotypes of dinucleotide repeat instability in human colorectal carcinoma cell lines deficient in DNA mismatch repair. Oncogene 18, 2143–2147 (1999). https://doi.org/10.1038/sj.onc.1202583
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DOI: https://doi.org/10.1038/sj.onc.1202583
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