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How Scientists Perceive CRISPR's Translational Promise and the Implications for Individuals with Genetic Conditions.
CRISPR (clustered regularly interspaced short palindromic repeats) somatic genome editing, an important promissory technology, presents a case study of the movement of basic scientists into translational research. In this paper, we explore how scientists experience the pulls of CRISPR's power and the pushes of economic and societal pressures in adopting new translational roles. Given basic scientists' emerging contact with and influence upon individuals with genetic conditions, we also examine how scientists understand the perspectives of affected populations, both as potential subjects of early experiments and as the patients who could receive future treatments. Finally, we consider the ethical implications of our findings and call for innovative approaches to translational research that help scientists engage with people with genetic conditions in early translational research.
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Clipping cancer with CRISPR: The precise gene-editing tool is showing promise in early cancer studies, although obstacles remain.
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CRISPR cuts turn gels into biological watchdogs.
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A CRISPR Moratorium Isn't Enough: We Need a Boycott.
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Potato trait development going fast-forward with genome editing.
Implementations and improvements of genome editing techniques used in plant science have increased exponentially. For some crops, such as potato, the use of transcription activator-like effector nucleases (TALEN) and clustered regularly interspaced short palindromic repeats (CRISPR) has moved to the next step of trait development and field trials, and should soon be applied to commercial cultivation.
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Proof-of-principle Intellia trial shows in vivo CRISPR activity.
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Off- and on-target effects of genome editing in mouse embryos.
Clustered regularly interspaced short palindromic repeats (CRISPR)-Cas-based genome editing technology has enabled manipulation of the embryonic genome. Unbiased whole genome sequencing comparing parents to progeny has revealed that the rate of Cas9-induced mutagenesis in mouse embryos is indistinguishable from the background rate of de novo mutation. However, establishing the best practice to confirm on-target alleles of interest remains a challenge. We believe that improvement in editing strategies and screening methods for founder mice will contribute to the generation of quality-controlled animals, thereby ensuring reproducibility of results in animal studies and advancing the 3Rs (replacement, reduction, and refinement).
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CRISPR/Cas9-Induced (CTG⋅CAG)n Repeat Instability in the Myotonic Dystrophy Type 1 Locus: Implications for Therapeutic Genome Editing.
Myotonic dystrophy type 1 (DM1) is caused by (CTG⋅CAG)n-repeat expansion within the DMPK gene and thought to be mediated by a toxic RNA gain of function. Current attempts to develop therapy for this disease mainly aim at destroying or blocking abnormal properties of mutant DMPK (CUG)n RNA. Here, we explored a DNA-directed strategy and demonstrate that single clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9-cleavage in either its 5' or 3' unique flank promotes uncontrollable deletion of large segments from the expanded trinucleotide repeat, rather than formation of short indels usually seen after double-strand break repair. Complete and precise excision of the repeat tract from normal and large expanded DMPK alleles in myoblasts from unaffected individuals, DM1 patients, and a DM1 mouse model could be achieved at high frequency by dual CRISPR/Cas9-cleavage at either side of the (CTG⋅CAG)n sequence. Importantly, removal of the repeat appeared to have no detrimental effects on the expression of genes in the DM1 locus. Moreover, myogenic capacity, nucleocytoplasmic distribution, and abnormal RNP-binding behavior of transcripts from the edited DMPK gene were normalized. Dual sgRNA-guided excision of the (CTG⋅CAG)n tract by CRISPR/Cas9 technology is applicable for developing isogenic cell lines for research and may provide new therapeutic opportunities for patients with DM1.
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Special Issue: CRISPR's Path to the Clinic.
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Therapeutic gene editing, making a point.
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