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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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Genome-wide analysis of DNA replication and double strand breaks by TrAEL-seq

Project description:We have designed a methodology for capture of DNA 3’ ends that allows mapping of resected DNA breaks, stalled replication forks and also normal replication fork progression. This Transferase-activated end ligation or TrAEL-seq method involves ligation of a functionalised linker to DNA 3’ ends followed by fragmentation, purification of adaptor ligated fragments, second adaptor ligation and library amplification. The major advantages of TrAEL-seq compared to other available methods are: i) an ability to map double strand breaks after resection, ii) excellent sensitivity and signal-to-noise in detecting replication fork stalling and iii) ability to map replication fork progression in unsynchronised, unlabelled populations of both yeast and mammalian cells. The samples provided here were selected to demonstrate different aspects of TrAEL-seq activity: the SfiI and dmc1 datasets shows capture of 3’ extended single strand DNA. The other yeast datasets show replication and replication fork stalling information. The RAF and RAF-GAL grown yeast samples show the effect transcriptional induction on replication fork progression. The hESC samples show the capacity to derive replication profiles from mammalian cells.

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Project description:Faithful replication of the entire genome requires replication forks to copy large contiguous tracts of DNA, and sites of persistent replication fork stalling present a major threat to genome stability. Understanding the distribution of sites at which replication forks stall, and the ensuing fork processing events, requires genome-wide methods that profile replication fork position and the formation of recombinogenic DNA ends. Here, we describe Transferase-Activated End Ligation sequencing (TrAEL-seq), a method that captures single-stranded DNA 3' ends genome-wide and with base pair resolution. TrAEL-seq labels both DNA breaks and replication forks, providing genome-wide maps of replication fork progression and fork stalling sites in yeast and mammalian cells. Replication maps are similar to those obtained by Okazaki fragment sequencing; however, TrAEL-seq is performed on asynchronous populations of wild-type cells without incorporation of labels, cell sorting, or biochemical purification of replication intermediates, rendering TrAEL-seq far simpler and more widely applicable than existing replication fork direction profiling methods. The specificity of TrAEL-seq for DNA 3' ends also allows accurate detection of double-strand break sites after the initiation of DNA end resection, which we demonstrate by genome-wide mapping of meiotic double-strand break hotspots in a dmc1Δ mutant that is competent for end resection but not strand invasion. Overall, TrAEL-seq provides a flexible and robust methodology with high sensitivity and resolution for studying DNA replication and repair, which will be of significant use in determining mechanisms of genome instability.

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