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Mismatch repair (MMR) efficiency and MSH2 gene mutation in human colorectal carcinoma cell line COLO320HSR

  • Human Genetics
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Abstract

Colorectal cancer (CC) is one of two diseases, in which the link between cancer proneness and DNA repair deficiency appears to be proved. A strict relationship between mismatch repair (MMR) gene mutations, microsatellite instability (MSI) has been found in familiar colorectal cancer (Lynch syndrome). Tumorigenesis at familiar cancer is initiated by biallelic mutations in the major MMR genes, namely MSH2 or MLH1. One of these mutations is an inherited germline alteration and the other is a somatic one. The initiating mutation in sporadic colorectal tumors was not still identified although biochemical and genetic signs of MMR deficiency are observed in tumor cells. Two currently used colorectal tumor cell lines HCT116 and COLO320HSR were derived from hereditary and sporadic tumors accordingly. HCT116 cell line exhibits MMR-deficiency due to biallelic deletion in MLH1. As a consequence this shows MSI phenotype and a near-diploid karyotype. COLO320HSR cell line is characterized by MSS phenotype with mostly imbalanced aberrations. This indicates MMR proficiency in these cells. However, both MMR-deficient HCT116 and COLO320HSR cells reveal near-diploid karyotype. Earlier we have shown that the number of secondary DNA double strand breaks, induced by methylnitrosourea (MNU), represent functional activity of cellular MMR. In the present study, using this approach we evaluated sensitivity to MNU and MMR activity in two colorectal tumor cell lines (HCT116, COLO320HSR) and compared them to that in the HeLa cell line, which have MMR-proficient phenotype. We showed that cell line COLO320HSR exhibits low MMR activity, close to the level of MMR-activity in HCT116 cell line. We found a mutation in MSH2-G520A gene in COLO320HSR. This neutral mutation apparently is not related to polymorphism as we failed to identify the same mutation in any of MSH2 gene sequences of lymphocytes from 30 patients with sporadic colorectal cancer.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia

    V. A. Tronov & I. I. Kramarenko

  2. Center of Medical Genetic Research, Russian Academy of Medical Sciences, Moscow, 115478, Russia

    S. F. Zakharov

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  1. V. A. Tronov
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  2. I. I. Kramarenko
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  3. S. F. Zakharov
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Original Russian Text © VA. Tronov, I.I. Kramarenko, S.F. Zakharov, 2007, published in Genetika, 2007, Vol. 43, No. 4, pp. 537–544.

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Tronov, V.A., Kramarenko, I.I. & Zakharov, S.F. Mismatch repair (MMR) efficiency and MSH2 gene mutation in human colorectal carcinoma cell line COLO320HSR. Russ J Genet 43, 430–436 (2007). https://doi.org/10.1134/S1022795407040126

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  • DOI: https://doi.org/10.1134/S1022795407040126

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