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- W2019256883 abstract "Male (101 × C3H)F1 hybrid mice, 10–12 weeks old, were injected i.p. with single doses of 2.5, 3.75 or 5.0 mg/kg of mitomycin C (MC). Spermatogonia were sample for mitotic chromosome analyses 6, 18 or 24 h after treatment. Spermatocytes were sample for meiotic chromosome analyses 50 or 60 days after treatment. The maximal yield of chromatid-type aberrations induced in spermatogonia was found 24 h after treatment with 5.0 mg/kg of MC. More than 50% of the cells carried at least one chromatid exchange. The majority (90%) of these were whole-arm exchanges derived from breaks in the centromeric heterochromatin. No translocation multivalents were found in spermatocytes analysed 50 or 60 days after treatment. The discrepancy between the presence of many symmetrical exchanges in spermatogonia and the absence of translocation multivalents in primary spermatocytes may be result of insensitivity of the stem cell spermatogonia against exchange induction by MC or of complete germinal selection against induced translocations before and/or during early meiosis. However, the possibility of missing translocations due to whole-arm exchanges in acrocentric chromosomes during the analysis of diakineses-metaphases I is also discussed. It is emphasized that comparisons of chromatid exchange frequencies in spermatogonia with the yield of translocation multivalents in spermatocytes descended from these spermatogonia as opposed to those from stem cells might provide an estimate of pre-diakinesis germinal selection against chromatid exchanges or the resulting translocations. This estimate is important for the quantitative evaluation of the genetic risk from environmental mutagens." @default.
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- W2019256883 title "Comparative cytogenetic study after treatment of mouse spermatogonia with mitomycin C" @default.
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- W2019256883 doi "https://doi.org/10.1016/0027-5107(74)90111-0" @default.
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