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Asymmetrical DNA and AT/GC base content of differential sector ofPleurodeles waltl sexual bivalent: A quantitative fluorescence imaging analysis in lampbrush chromosomes

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Abstract

The mitotic Z and W sex chromosomes inPleurodeles seem to be identical. Earlier morphological and molecular analyses of lampbrush paired chromosomes in the female meiosis showed clearly that 20% of the chromosomal length located in the middle part of the sex bivalent (bivalent IV) is heteromorphic. We investigated here the base content and composition of the DNA axes in the heteromorphic region by quantitative fluorescence imaging using various base-specific (DAPI, Hoechst 33342 and chromo-mycin A3) or base-nonspecific (ethidium bromide) fluorescent DNA probes. Our results show a significantly higher percentage of AT bases in Z than in W differential sectors. In addition the entire base content of Z appears slightly higher than that of W.

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Authors and Affiliations

  1. Laboratoire de Génétique du Développement, Université P. et M. Curie, Paris, France

    M. T. Loones & J. C. Lacroix

  2. Laboratoire de Physique et Chimie Biomoléculaires, Paris, France

    C. Amirand & P. Vigny

  3. Laboratoire Associé INSERM U-310-INRA Station 806, Biologie Moléculaire et Cellulaire à Basses Températures, Institut de Biologie Physico-Chimique, Paris, France

    P. Debey

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  1. M. T. Loones
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  2. C. Amirand
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  3. P. Debey
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  4. J. C. Lacroix
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  5. P. Vigny
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Loones, M.T., Amirand, C., Debey, P. et al. Asymmetrical DNA and AT/GC base content of differential sector ofPleurodeles waltl sexual bivalent: A quantitative fluorescence imaging analysis in lampbrush chromosomes. Chromosome Res 2, 235–244 (1994). https://doi.org/10.1007/BF01553324

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  • DOI: https://doi.org/10.1007/BF01553324

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