Editing the genome of hiPSC with CRISPR/Cas9: disease models.
- Authors
- Bassett, Andrew R
- Year
- 2017
- Journal
- Mammalian genome : official journal of the International Mammalian Genome Society
- PMID
- 28303292
- DOI
- 10.1007/s00335-017-9684-9
- PMCID
- PMC5569153
The advent of human-induced pluripotent stem cell (hiPSC) technology has provided a unique opportunity to establish cellular models of disease from individual patients, and to study the effects of the underlying genetic aberrations upon multiple different cell types, many of which would not normally be accessible. Combining this with recent advances in genome editing techniques such as the clustered regularly interspaced short palindromic repeat (CRISPR) system has provided an ability to repair putative causative alleles in patient lines, or introduce disease alleles into a healthy "WT" cell line. This has enabled analysis of isogenic cell pairs that differ in a single genetic change, which allows a thorough assessment of the molecular and cellular phenotypes that result from this abnormality. Importantly, this establishes the true causative lesion, which is often impossible to ascertain from human genetic studies alone. These isogenic cell lines can be used not only to understand the cellular consequences of disease mutations, but also to perform high throughput genetic and pharmacological screens to both understand the underlying pathological mechanisms and to develop novel therapeutic agents to prevent or treat such diseases. In the future, optimising and developing such genetic manipulation technologies may facilitate the provision of cellular or molecular gene therapies, to intervene and ultimately cure many debilitating genetic disorders.
Application of iPS models of disease to high throughput screening. Cells derived from patients with disease and healthy controls can be used to generate disease-relevant cell types, which can be phenotypically compared with each other. Such cells can be generated in sufficient numbers to be able to perform whole genome genetic screens to identify molecular and cellular mechanisms of disease and therapeutic targets, and also for high throughput drug screening to identify compounds that may be able to revert the disease phenotype. Differences between patient-derived and control cells can be used to identify potential therapeutic targets or agents
Importance of genome editing in iPS disease modelling. iPSCs can be derived from healthy (blue) and disease (orange) patients, and after differentiation into an appropriate cell type, comparison of molecular or cellular phenotypes can be made. To minimise variability due to genetic background, genome editing can be used to either correct patient-derived cells (dark blue) or to introduce putative causative lesions into cells derived from healthy individuals (purple). This leads to isogenic pairs of cell lines (purple box or orange box) that identify the true impact of the engineered change on the cellular phenotype
Linkage disequilibrium (LD) makes identification of causative SNPs challenging. In a typical region of the human genome, many SNPs (orange box) are in strong LD with the tag SNP (red) identified by a GWAS study. Genome editing can be used to identify the causative lesion from within this LD block. LD is measured as R-squared values between pairs of SNPs, and indicated on the heatmap
Strategies for genome editing using CRISPR/Cas9. a Gene knockout—CRISPR-enhanced HDR can be employed to replace a critical exon with a selectable drug resistance cassette (drug R), on one allele, relying on NHEJ-dependent indels to disrupt the other allele. b Gene knockout—A CRISPR-induced DSB can be used to efficiently introduce indels on both alleles. c Conditional knockout by inversion (COIN)—CRISPR-enhanced HDR can be used to introduce a Cre-recombinase invertible cassette, flanked by loxP sites (black triangles) into an artificial intron. This contains a splice acceptor site followed by a transcriptional termination signal (pA), so in one orientation it causes premature termination and mutation of the gene. In the opposite orientation, splicing occurs around the cassette, allowing the normal gene product to be produced from this allele. The second allele is disrupted by NHEJ-induced indels as in (a). d SNP introduction—A CRISPR-induced DSB is used to enhance HDR with a 100–200 nt ssDNA oligonucleotide repair template (green) to introduce small defined changes. e Scarless SNP introduction—A selectable marker cassette (drug R, green) is introduced into an intron or non-functional region along with the SNP of interest, and subsequently removed by a further round of HDR, or the piggyBac transposase. f Scarless SNP introduction—A SNP of interest is introduced as in D along with second site mutations necessary to prevent re-cleavage by the Cas9 enzyme. A subsequent second round of editing in a similar manner corrects the secondary mutations to leave only the SNP of interest. g Epigenetic editing—Catalytically dead Cas9 protein is used to recruit a variety of enzymatic activities (Enz, green circle) to specific sites, leading to transcriptional modulation (both positively and negatively), DNA or histone modifications such as DNA methylation, histone acetylation, methylation or phosphorylation, or cytosine deamination
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