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Single Molecule Imaging of the DNA Damage Response in Live Cells

"Accurate DNA replication is key to maintaining genomic stability. Replication is immensely complex requiring error-free duplication of several billion bases each time a human cell divides. The DNA replication machinery must deal... ver más

30/04/2016

UOS

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

THE UNIVERSITY OF SUSSEX No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Fecha límite participación Sin fecha límite de participación.

Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2016-04-30 No tenemos la información de la convocatoria

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Líder del proyecto

THE UNIVERSITY OF SUSSEX No se ha especificado una descripción o un objeto social para esta compañía.

TRL 4-5

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto "Accurate DNA replication is key to maintaining genomic stability. Replication is immensely complex requiring error-free duplication of several billion bases each time a human cell divides. The DNA replication machinery must deal with a wide range of DNA damage, aberrant secondary structures and DNA:protein complexes; obstacles that cause replication forks to arrest. Arrested replication complexes are actively stabilised by checkpoint pathways, but in some cases component proteins still dissociate from the site of DNA incorporation, resulting in fork ¿collapse¿. Collapsed forks can be restarted by homologous recombination (HR)-based processes, but are strongly associated with gross chromosomal rearrangements. Thus, the advantage gained by restarting a collapsed fork comes at the expense of an increased potential for genome instability. Structural, biochemical, and molecular techniques identified the main components and regulators of these processes, but are inherently limited to studying the system in bulk, thereby averaging events and limiting our understanding of the dynamics and behaviour of molecular participants. To overcome these limitations and to study single molecules at a single arrested or collapsed fork I propose to develop an nTIRF-PALM ¿super-resolution¿ microscopy platform that will allow the identification of individual protein molecule as well as very small numbers of molecules at <50 nanometer resolution inside the nucleus of a living eukaryotic cell. I propose to apply this methodology to the model organism fission yeast (S. pombe) to study the organization and structure of normal and restarted replication forks. To achieve this I propose to extend the development of site-specific and temporally controlled replication fork arrest systems to manipulate a single replication fork at a defined DNA locus. By creating a variety of fluorescent protein tags we will record ""molecular movies"" to provide insight into the dynamics and reaction mechanisms."

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