Highly elevated ultraviolet-induced mutation frequency in isolated Chinese hamster cell lines defective in nucleotide excision repair and mismatch repair proteins

K. I. Nara, F. Nagashima, Akira Yasui

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    We have isolated N-methyl-N'-nitro-N-nitrosoguanidine-resistant cell lines from 43-3B Chinese hamster ovary cells, which are deficient in the ERCC1 gene involved in nucleotide excision repair. By Western blotting analysis, we found cell lines that are deficient or decreased in the amount of MSH6, or PMS2, or MSH2 proteins. Cell extracts of these cell lines show reduced efficiency of G:T mismatch repair activity. Compared with 43-3B, these cell lines exhibit highly elevated UV-induced mutation rates, indicating that mammalian mismatch repair can suppress UV-induced mutagenesis and may play a role in the fidelity of DNA replication at the sites of UV damage.

    Original languageEnglish
    Pages (from-to)50-52
    Number of pages3
    JournalCancer Research
    Volume61
    Issue number1
    Publication statusPublished - 2001 Jan 1

    ASJC Scopus subject areas

    • Oncology
    • Cancer Research

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