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- W1999287788 abstract "Dans la transformation du pneumocoque, certaines mutations ponctuelles s'intègrent par l'intermédiaire d'excision et réparation du DNA. Le segment qui est hétéroduplex au niveau de la séquence mutée face à la séquence sauvage devient homoduplex. Ce transfert d'information est une conversion génique. Dans une première partie, nous présentons une revue des travaux effectués dans ce domaine en décrivant plus particulièrement quelle est la spécificité de base du système de reconnaissance et les expériences montrant qu'il s'agit d'un processus qui porte sur plusieurs kilobases de part et d'autre de la confrontation base mutée-base de type sauvage. Dans une seconde partie, nous décrivons un autre système de conversion génique qui est, au contraire du précédent, très localisé et ne porte que sur 5 à 27 bases. Il est déclenché par la présence d'une mutation ponctuelle qui résulte de la transversion 5′…ATTCAT… 5′ …ATTAAT… Seul, l'hétéroduplex 5′…A…3′/3′…G…5′ subit la conversion. In pneumococcal transformation some point mutations are integrated by an excision-repair pathway which switches the heteroduplex DNA into homoduplex. This transfer of information is a gene conversion. We have reviewed some of the properties of this system especially those relating to heteroduplex specificity and given evidence that this extends over several kilobases of DNA. We then describe a new process of conversion in pneumococcal transformation which occurs over a very short distance (5 to 27 base-pairs) and is triggered by a single site mutation resulting from the transversion 5′-ATTCAT…to 5′…ATTAAT… Only one of the two heteroduplexes 5′…A…3′/3′…G…5′, is converted." @default.
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- W1999287788 date "1985-03-01" @default.
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- W1999287788 title "Long- and short-patch gene conversions in Streptococcus pneumoniae transformation" @default.
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- W1999287788 doi "https://doi.org/10.1016/s0300-9084(85)80084-5" @default.
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