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Publications (1)2.79 Total impact

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    P Mosesso · F Darroudi · M van den Berg · S Vermeulen · F Palitti · A.T. Natarajan
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    ABSTRACT: Frequencies of symmetrical and asymmetrical exchange aberrations induced by two inhibitors of topoisomerase II, namely, 4'-(9-acridinylamino) methanesulfon-m-anisidide (m-AMSA) and etoposide (VP16), were estimated in human peripheral blood lymphocytes. The aberrations were scored using conventional Giemsa staining and fluorescence in situ hybridization (FISH) techniques, using chromosomespecific DNA libraries. Stable aberrations (translocations) were detected using two cocktails of DNA libraries specific for three chromosomes, namely 1, 3 and X and 2, 4 and 8, representing ˜40% of the whole human genome. The frequencies of dicentrics and translocations increased in a dose-dependent manner, however, m-AMSA was found to be a more potent inducer of chromosomal aberrations in comparison with VP16 (at concentrations at which comparable frequencies of aberrations were induced) by 20- to 30-fold. When corrected for DNA content of chromosomes in each cocktail, a higher frequency of translocations with the cocktail consisting of chromosomes 2, 4 and 8 in comparison with 1, 3 and X was evident. The genomic translocation frequency calculated from chromosome painting analysis for m-AMSA exceeded that estimated for dicentrics by ˜2-fold. However, for VP16 almost equal frequencies of both types of chromosome exchange were found.
    Full-text · Article · Feb 1998 · Mutagenesis