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TrAEL-seq for CUP1 locus

ABSTRACT: TrAEL-seq for CUP1 locus

PROVIDER: PRJNA693455 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13489210.fastq.gz	Fastqsanger.gz
	SRR13489211.fastq.gz	Fastqsanger.gz
	SRR13489212.fastq.gz	Fastqsanger.gz
	SRR13489213.fastq.gz	Fastqsanger.gz
	SRR13489214.fastq.gz	Fastqsanger.gz

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TrAEL-seq for CUP1 locus

Project description:1) The Pgal-3HA cup1 yeast strain, in which all CUP1 ORFs are replaced with 3HA and all CUP1 promoters are replaced by GAL1-10 promoters (PMID: 28654659, which carries ~17 tandem repeats of the modified Pgal-3HA cup1 repeat) undergoes extensive CNV when shifted to galactose. Here we use TrAEL-seq to look for replication fork stalling in this strain with and without induction. 2) We also profile the impact on replication of integrating an ARSH4 origin upstream of the RSC30 gene (so outside the CUP1 locus), using the 3xCUP1 strain which carries 3 repeats of CUP1 (PMID: 28654659). The origin was integrated with a URA3 marker, the control strain has the URA3 marker but no origin.

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Project description:Precise DNA replication is critical to the maintenance of genome stability, and the DNA replication machinery is a focal point of many current and upcoming chemotherapeutics. TrAEL-seq is a robust method for profiling DNA replication genome-wide that works in unsynchronised cells and does not require treatment with drugs or nucleotide analogues. Here, we provide an updated method for TrAEL-seq including multiplexing of up to 6 samples that dramatically improves sample quality and throughput, and we validate TrAEL-seq in multiple mammalian cell lines. The updated protocol is straightforward and robust yet provides excellent resolution comparable to OK-seq in mammalian cell samples, and does not require cell synchronisation, drug treatment, labelling or sorting. High resolution replication profiles can be obtained across large panels of samples and in dynamic systems, for example during the progressive onset of oncogene induced senescence. In addition to mapping zones where replication initiates and terminates, TrAEL-seq is sensitive to replication fork speed, revealing effects of both transcription and proximity to replication initiation zones on fork progression. Although forks move more slowly through transcribed regions, this does not have a significant impact on the broader dynamics of replication fork progression, which is dominated by rapid fork movement in long replication regions (>1Mb). Short and long replication regions are not intrinsically different, and instead replication forks accelerate across the first ~1 Mb of travel such that forks progress faster in the middle of regions lying between widely spaced initiation zones. We propose that this is a natural consequence of fewer replication forks being active later in S phase when these distal regions are replicated and there being less competition for replication factors.

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