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dc.contributor.advisorFerreira, Helder
dc.contributor.authorSwanston, Amy
dc.coverage.spatial256 p.en_US
dc.description.abstractAcriflavine (ACF) is a Topoisomerase 2 (Top2) poison, a class of drugs which stall Top2 during its reaction cycle causing the formation of persistent DNA breaks to which Top2 remains covalently bound. Deletion of ULS1 causes sensitivity to ACF, with cells showing activation of the Rad53 DNA damage checkpoint. Uls1 is a chromatin remodelling enzyme also implicated in the regulation of levels of SUMO conjugated proteins. We show that Uls1 has both a genetic and physical interaction with Top2, with uls1Δ sensitivity to ACF being linked to Top2 activity. Analysis of Uls1 and Top2 localisation genome wide via ChIP-seq reveals areas where the two proteins co-localise, with Top2 enrichment on chromatin being altered upon deletion of ULS1. At these areas, the presence of Uls1 prevents accumulation of Top2 upon addition of ACF. Our data suggests that Uls1 is required for regulation of stalled Top2. Top2 poisons are used therapeutically as anti-cancer drugs, however these drugs have been implicated in the formation of secondary cancers due to chromosomal translocations arising during the repair of Top2 generated double strand breaks (DSB). The use of dual targeted therapies where a Top2 poison is paired with an inhibitor of another pathway that increases sensitivity to the Top2 poison allows a lower dose to be used, therefore reducing harmful side effects. Our work looked to identify Top2 poison sensitive pathways in S. cerevisiae, where non-essential and essential gene mutants were assayed for sensitivity to ACF. This allowed a comprehensive analysis of 83% of the genes in S. cerevisiae, identifying novel genes within the areas of DNA repair, DNA replication, transcription, chromatin structure, protein modification/degradation, cell division/cell cycle and cellular organisation/cytoskeleton as being important in the response to this bulky adduct.en_US
dc.description.sponsorshipThis work was supported by a scholarship from the St Andrews School of Biology and a "Biotechnology and Biological Sciences Research Council grant [BB/M008142/1]. The University of St Andrews Bioinformatics Unit is supported by a Wellcome Trust ISSF grant [105621/Z/14/Z]." -- Acknowledgementsen
dc.publisherUniversity of St Andrews
dc.relationInvestigation of the chromatin remodelling enzyme Uls1 and its interactions with Topoisomerase 2 in S. cerevisiae (Thesis data) Swanston, A., University of St Andrews. DOI:
dc.subjectMolecular biologyen_US
dc.subjectCell biologyen_US
dc.subjectChromatin remodellingen_US
dc.subjectChromatin remodelleren_US
dc.subjectProtein modificationen_US
dc.subjectTop2 poisonen_US
dc.subjectDrug screenen_US
dc.subjectGenetic screenen_US
dc.subjectChromatin immunoprecipitationen_US
dc.subject.lcshDNA topoisomerase IIen
dc.subject.lcshAdenosine triphosphataseen
dc.subject.lcshSaccharomyces cerevisiaeen
dc.titleInvestigation of the chromatin remodelling enzyme Uls1 and its interactions with Topoisomerase 2 in  S. cerevisiaeen_US
dc.contributor.sponsorUniversity of St Andrews. School of Biologyen_US
dc.contributor.sponsorBiotechnology and Biological Sciences Research Council (BBSRC)en_US
dc.contributor.sponsorWellcome Trusten_US
dc.type.qualificationnamePhD Doctor of Philosophyen_US
dc.publisher.institutionThe University of St Andrewsen_US
dc.rights.embargoreasonThesis restricted in accordance with University regulations. Print and electronic copy restricted until 3rd April 2022en

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