Volcanic bacteria
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1021361 | ENA |
REPOSITORIES: ENA
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Project description:We analyzed levels of 5-methyl cytosine nnnn CCCGGG target sites by sequential restriction digest by SmaI and XmaI enzymes, ligating Illumina adaptors to the restriction fragments and reading methylation-specific signatures at the ends of restriction fragments by paired ends Illumina high throughput sequencing. Digital restriction enzyme analysis of methylation (DREAM) was performed to determine the methylation profile of SW48 colon cancer cell line genomic DNA. Genomic DNA spiked in with unmethylated, partially methylated and fully methylated standards was sequentially cut at CCCGGG sites with the methylation-sensitive enzyme SmaI (blunt ends) and its methylation-tolerant neoschizomer XmaI (5'CCGG overhangs), creating different end sequences that represented methylation status of the CCCGGG sites. These end sequences were analyzed by Illumina high throughput sequencing. Methylation status at individual CCCGGG sites across the genome was determined by counting the methylated reads with the CCGGG signature and unmethylated reads with the GGG signature at the beginnings of the sequencing reads after alignment to the human genome.
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Project description:Generation of transgenic cell lines is limited by inefficient gene editing requiring genotypic screening of hundreds to thousands of colonies to isolate correctly gene-edited cells. Here, we describe a novel method called CRISPRa On-Target Editing Retrieval (CRaTER) that enriches for cells with on-target knock-in of a promoterless cDNA-fluorescent reporter transgene by transiently overexpressing the targeted endogenous genetic locus and sorting for fluorescent cells. We use CRaTER to enrich for rare cells with heterozygous, biallelic-editing of the endogenous, transcriptionally-inactive MYH7 locus in human induced pluripotent stem cells (hiPSC), resulting in a 9-fold enrichment compared to antibiotics selection alone. We leveraged CRaTER to enrich for heterozygous knock-in of a library of single nucleotide variants (SNV) in MYH7, a gene encoding for sarcomeric MHC-β wherein autosomal dominant missense mutations cause cardiac and skeletal myopathies. CRaTER enabled 90% enrichment of heterozygous, biallelically-edited hiPSCs – a 38.6-fold enrichment compared to antibiotics selection alone – to generate 113 SNVs comprising 78 missense variants in MYH7. hiPSCs that have undergone CRaTER enrichment can differentiate to cardiomyocytes and exhibit expected localization and expression of MHC-β fusion proteins. Together, CRaTER substantially reduces the screening required for isolation of gene-edited cells, enabling the generation of transgenic cell lines at unprecedented scale.
2023-01-31 | GSE213520 | GEO