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Amplicon sequencing of genomically-encoded guide RNA sequences for the Brunello CRISPR library in eHap cells

ABSTRACT: Amplicon sequencing of genomically-encoded guide RNA sequences for the Brunello CRISPR library in eHap cells

PROVIDER: PRJEB37745 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR4018550.fastq.gz	Fastqsanger.gz
	ERR4018551.fastq.gz	Fastqsanger.gz
	ERR4018552.fastq.gz	Fastqsanger.gz

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Amplicon sequencing of genomically-encoded guide RNA sequences for the Brunello CRISPR library in eHap cells

Project description:eHap CRISPR-Cas9 mutagenized cells with no selection serves as a control. RPS6p antibody staining on the mutagenized eHap cells was used in a flow-sorting approach to isolate RPS6p high and low populations respectively. The genomic DNA from these different samples was isolated, subjected to PCR to amplify the genomically-encoded guide RNA sequences, the product(s) of which was then sequenced on a Hi-Seq X Ten instrument by Novogene.

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Amplicon Sequencing of gRNAs from Brunello CRISPR mutagenized U87MG or eHAP cells after live/dead selection with Reovirus Type 3 Dearing Strain.

Project description:eHAP or U87MG cells were stably transduced with lentiCas9-Blast (Addgene, #52962) and subsequently selected using Blasticidin. Then, 300 million eHAP or U87MG cells that constitutively express Cas9 were transduced with lentiGuide-Puro from the Brunello library at MOI 0.3. Cells were then selected with puromycin, expanded to 3 billion cells, and then pooled together and cryofrozen in aliquots. One hundred million cells were thawed constituting over 1000× genome coverage worth of mutagenized library. Twenty T175 flasks were used for the U87MG-based screen, while twelve T175 flasks were used for the eHAP-based screen. The cells were allowed to recover for 48 hours before infecting with ReoT3D at an MOI of 0.1. Obvious CPE was observed within 72 hours. eHAP-resistant colonies were harvested two weeks later, while U87MG-resistant colonies were harvested six weeks later. The uninfected reference used was the unselected starting population. The unselected and selected cells were both processed with QIAamp DNA columns to purify the gDNA. A first round of PCR was used to amplify the guide RNA sequences encoded in the gDNA, followed by a second round of PCR to add the barcodes/adapters for amplicon sequencing. 2% agarose gels and a QIAquick gel extraction kit were used to purify the amplicons. The amplicons were then subjected to next-generation sequencing on a HiSeq instrument lane (Illumina) via Novogene.

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Project description:Triggers of innate immune signaling in the CNS of amyotrophic lateral sclerosis and frontotemporal degeneration (ALS/FTD) patients remain elusive. We report the presence of cytoplasmic double-stranded RNA (cdsRNA), an established trigger of innate immunity, in ALS-FTD brains carrying C9ORF72 intronic hexanucleotide expansions that included genomically encoded expansions of the G4C2 repeat sequences. Presence of cdsRNA in human brains was coincident with cytoplasmic TDP-43 inclusions, a pathologic hallmark of ALS/FTD. Introducing cdsRNA into cultured human neural cells induced Type I interferon (IFN-I) signaling and death that was rescued by FDA-approved JAK inhibitors. In mice, genomically encoded dsRNAs expressed exclusively in a neuronal class induced IFN-I and death in connected neurons non-cell autonomously. Our findings establish that genomically encoded cdsRNAs trigger sterile, viral-mimetic IFN-I induction, and propagated death within neural circuits and may drive neuroinflammation and neurodegeneration in ALS/FTD patients.

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