30 research outputs found

    Generation of Covalently Closed Circular DNA of Hepatitis B Viruses via Intracellular Recycling Is Regulated in a Virus Specific Manner

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    Persistence of hepatitis B virus (HBV) infection requires covalently closed circular (ccc)DNA formation and amplification, which can occur via intracellular recycling of the viral polymerase-linked relaxed circular (rc) DNA genomes present in virions. Here we reveal a fundamental difference between HBV and the related duck hepatitis B virus (DHBV) in the recycling mechanism. Direct comparison of HBV and DHBV cccDNA amplification in cross-species transfection experiments showed that, in the same human cell background, DHBV but not HBV rcDNA converts efficiently into cccDNA. By characterizing the distinct forms of HBV and DHBV rcDNA accumulating in the cells we find that nuclear import, complete versus partial release from the capsid and complete versus partial removal of the covalently bound polymerase contribute to limiting HBV cccDNA formation; particularly, we identify genome region-selectively opened nuclear capsids as a putative novel HBV uncoating intermediate. However, the presence in the nucleus of around 40% of completely uncoated rcDNA that lacks most if not all of the covalently bound protein strongly suggests a major block further downstream that operates in the HBV but not DHBV recycling pathway. In summary, our results uncover an unexpected contribution of the virus to cccDNA formation that might help to better understand the persistence of HBV infection. Moreover, efficient DHBV cccDNA formation in human hepatoma cells should greatly facilitate experimental identification, and possibly inhibition, of the human cell factors involved in the process

    Daniel Russo, Saint Jérôme en Italie. Étude d'iconographie et de spiritualité (XIII-XIVe siècles)

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    Lapostolle Christine. Daniel Russo, Saint Jérôme en Italie. Étude d'iconographie et de spiritualité (XIII-XIVe siècles). In: Médiévales, n°14, 1988. La culture sur le marché, sous la direction de Yvonne Cazal . pp. 131-134

    Otto Pächt, L'enluminure médiévale, traduit de l'allemand par Jean Lacoste

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    Lapostolle Christine. Otto Pächt, L'enluminure médiévale, traduit de l'allemand par Jean Lacoste. In: Médiévales, n°35, 1998. L'adoption. Droits et pratiques, sous la direction de Didier Lett et Christopher Lucken. pp. 154-155

    Otto Pächt, L'enluminure médiévale, traduit de l'allemand par Jean Lacoste

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    Lapostolle Christine. Otto Pächt, L'enluminure médiévale, traduit de l'allemand par Jean Lacoste. In: Médiévales, n°35, 1998. L'adoption. Droits et pratiques, sous la direction de Didier Lett et Christopher Lucken. pp. 154-155

    Aline Rousselle, Porneia

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    Lapostolle Christine. Aline Rousselle, Porneia. In: Médiévales, n°6, 1984. Au pays d'Arthur. pp. 110-113

    Images et apparitions : illustrations des «Miracles de Nostre Dame»

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    Lapostolle Christine. Images et apparitions : illustrations des «Miracles de Nostre Dame». In: Médiévales, n°2, 1982. Gautier de Coinci: le texte du miracle. pp. 47-66

    Daniel Russo, Saint Jérôme en Italie. Étude d'iconographie et de spiritualité (XIII-XIVe siècles)

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    Lapostolle Christine. Daniel Russo, Saint Jérôme en Italie. Étude d'iconographie et de spiritualité (XIII-XIVe siècles). In: Médiévales, n°14, 1988. La culture sur le marché, sous la direction de Yvonne Cazal . pp. 131-134

    Aline Rousselle, Porneia

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    Lapostolle Christine. Aline Rousselle, Porneia. In: Médiévales, n°6, 1984. Au pays d'Arthur. pp. 110-113

    Frugoni, Una lontana città. Sentimenti e immagini nél Medioevo

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    Lapostolle Christine. Frugoni, Una lontana città. Sentimenti e immagini nél Medioevo. In: Médiévales, n°9, 1985. Langues, sous la direction de François Jacquesson . pp. 141-144

    Temps, lieux et espaces. Quelques images des XIVe et XVe siècles

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    Lapostolle Christine. Temps, lieux et espaces. Quelques images des XIVe et XVe siècles. In: Médiévales, n°18, 1990. Espaces du Moyen-âge, sous la direction de Patrick Gautier Dalché . pp. 101-120
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