12 research outputs found

    Entretien avec Anne-Marie de Recondo

    No full text
    Des années 1950 à la fin des années 1990, Anne-Marie de Recondo a vécu la révolution moléculaire. Physiologiste de formation, elle devenue au fil des ans une spécialiste reconnue des mécanismes moléculaires de la réplication chez les eucaryotes et les archées. Son témoignage sur cette époque montre aussi les difficultés qu’elle a pu rencontrer.From the 1950s to the late 1990s, Anne-Marie de Recondo lived through the molecular revolution. Trained as a physiologist, she became over the years a recognized specialist in the molecular mechanisms of replication in eukaryotes and archaea. Her account of this period also shows the difficulties she may have encountered

    Deoxyribonucleic acid of the crab Cancer pagurus. III. Intracellular localization of poly d(AT) of Cancer pagurus by hybridization in situ

    No full text
    The satellite DNA poly [d(AT) · d(TA)] of the crab Cancer pagurus has been localized in situ by DNA-DNA hybridization in the nuclei of various spermatogenetic, midgut gland, intestinal and tegument cells. The specificity of hybridization was checked by various tests before, during and after hybridization. The nuclear sites revealed by this method were compared with those shown by quinacrine mustard or Giemsa staining. The AT-rich satellite DNA appears to be highly dispersed and does not seem to have any preferential localization inside the crab interphasic nucleus. This situation was compared with that presented by mouse nuclei using similar methods. © 1974.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Autoradiographic demonstration of DNA replication in ultrathin sections of plastic-embedded tissues using an exogeneous DNA polymerase

    No full text
    A DNA-dependent DNA polymerase isolated from regenerating rat liver can mediate the incorporation of tritiated nucleoside triphosphates into acid-insoluble polydeoxyribonucleotides using the DNA contained in ultrathin sections of glycol methacrylate-embedded crab testis as initiator-template. © 1975 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    DNA polymerase δ is required for the replication feedback control of cell cycle progression in Schizosaccharomyces pombe

    No full text
    International audienceDNA replication and DNA repair are essential cell cycle steps ensuring correct transmission of the genome. The feedback replication control system links mitosis to completion of DNA replication and partially overlaps the radiation checkpoint control. Deletion of the chk1/rad27 gene abolishes the radiation but not the replication feedback control. Thermosensitive mutations in the DNA polymerase delta, cdc18 or cdc20 genes lead cells to arrest in the S phase of the cell cycle. We show that strains carrying any of these mutations enter lethal mitosis in the absence of the radiation checkpoint chk1/rad27. We interpret these data as an indication that an assembled replisome is essential for replication dependent control of mitosis and we propose that the arrest of the cell cycle in the thermosensitive mutants is due to the chk1+/rad27+ pathway, which monitors directly DNA for signs of damage

    Acide désoxyribonucléique du crabe « cancer pagurus »

    No full text
    Une étude physicochimique a été réalisée sur le DNA total natif du crabe « Cancer pagurus » et sur chacun de ses deux composants : le composant principal (80 % du DNA total) et le poly d(AT) (20 % du DNA total).I. La calcul des paramètres thermodynamiques correspondant à la dénaturation thermique confirme la dificrence de structure des deux composants : on observe une augmentation des valeurs de l’entropie et de l’enthalpie quand le pourcentage en bases GC des DNA diminue.II. Les résultats obtenus à partir des centrifugations en gradient de densité en chlorure de césium semblent établir que le DNA total natif est un mélange des deux composants qui ne sont pas intégrés dans la même espèce de molécules. Mais l’étude de la distribution des constantes de sédimentation conduit à une conclusion opposée. A partir de ces résultats il est difficile de savoir si le DNA total est un mélange de deux groupes de molécules ou si le DNA correspond à seulement une espèce de molécules renfermant incorporés de longs filaments de poly d(AT). Pour résoudre ce problème, il est nécessaire d'utiliser d’autres méthodes qui feront l’objet de la suite de ce travail
    corecore