Abstract:
:Since the pioneering proposal of the replicon model of DNA replication 50 years ago, the predicted replicons have not been identified and quantified at the cellular level. Here, we combine conventional and super-resolution microscopy of replication sites in live and fixed cells with computational image analysis. We complement these data with genome size measurements, comprehensive analysis of S-phase dynamics and quantification of replication fork speed and replicon size in human and mouse cells. These multidimensional analyses demonstrate that replication foci (RFi) in three-dimensional (3D) preserved somatic mammalian cells can be optically resolved down to single replicons throughout S-phase. This challenges the conventional interpretation of nuclear RFi as replication factories, that is, the complex entities that process multiple clustered replicons. Accordingly, 3D genome organization and duplication can be now followed within the chromatin context at the level of individual replicons.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chagin VO,Casas-Delucchi CS,Reinhart M,Schermelleh L,Markaki Y,Maiser A,Bolius JJ,Bensimon A,Fillies M,Domaing P,Rozanov YM,Leonhardt H,Cardoso MCdoi
10.1038/ncomms11231subject
Has Abstractpub_date
2016-04-07 00:00:00pages
11231issn
2041-1723pii
ncomms11231journal_volume
7pub_type
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