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RNA editing profile in miRNA loci in human [breast]

ABSTRACT: We utilized the targeted RNA-seq to identify and quantify RNA editing events located in miRNA and mRNA loci.

ORGANISM(S): Homo sapiens

PROVIDER: GSE124374 | GEO | 2020/04/12

REPOSITORIES: GEO

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RNA editing profile in miRNA loci in human [ADAR1 KO, Drosha KD]

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RNA editing profile in miRNA loci in human [breast]

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Project description:Despite lingering genotoxicity concerns, CRISPR-based genome editing has progressively entered the gene therapy field. Here we report that interactions between nucleotide sequences that are localized on the same chromosome and exhibit a high degree of homology contribute substantially to post-editing chromosomal rearrangements. We successfully employed corrective editing strategies at the NCF1 gene, as well as at the colocalized pseudogenes, NCF1B and NCF1C, in a human cell line model of p47phox-deficient chronic granulomatous disease and in patient-derived human hematopoietic stem cells. Upon genetic manipulation, an improved droplet digital PCR-based method identified cells with altered copy numbers, spanning megabases from the edited loci. We attributed the high aberration frequency to the interaction between repetitive sequences and their predisposition to recombination events. Our findings emphasize the need for careful evaluation of the target-specific genomic context, such as the presence of homologous regions, whose genome instability can constitute a risk factor for chromosomal rearrangements upon genome editing.

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Project description:we used RNA-Seq to quantify the RNA editing level at more than 8,000 previously annotated exonic A-to-I RNA editing sites in two brain regions - prefrontal cortex and cerebellum - of humans, chimpanzees and rhesus macaques. We observed substantial conservation of RNA editing levels between the brain regions, as well as among the three primate species. Evolutionary changes in RNA editing were nonetheless evident among the species. Across lifespan, we observed an increase of the RNA editing level with advanced age in both brain regions of all three primate species. poly(A) enriched RNAs extracted from pooled samples of two brain regions: CBC and PFC of chimpanzee and macaque, fragmented, revers transcribed to double-stranded cDNA using random hexamers. Sequencing libraries were prepared according to the paired-end non-strand-specific sample preparation protocol of Illumina. Each sample was sequenced in a separate lane in the Illumina Genome Analyzer II system, using the 75-bp paired-end sequencing protocol. human data was downloaded from SRA [SRP005169]

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