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The exact protocol for lentiviral production will vary depending on the research aim and applied library. [ 35 ] [ 43 ] [ 44 ] If a two vector-system is used, for example, cells are sequentially transduced with Cas9 and sgRNA in a two-step procedure.
Knock-out mutations caused by CRISPR-Cas9 result from the repair of the double-stranded break by means of non-homologous end joining (NHEJ) or POLQ/polymerase theta-mediated end-joining (TMEJ). These end-joining pathways can often result in random deletions or insertions at the repair site, which may disrupt or alter gene functionality.
Lentiviral vectors in gene therapy is a method by which genes can be inserted, modified, or deleted in organisms using lentiviruses. Lentiviruses are a family of viruses that are responsible for diseases like AIDS , which infect by inserting DNA into their host cells' genome . [ 1 ]
[1] [2] [3] Perturb-seq combines multiplexed CRISPR mediated gene inactivations with single cell RNA sequencing to assess comprehensive gene expression phenotypes for each perturbation. Inferring a gene’s function by applying genetic perturbations to knock down or knock out a gene and studying the resulting phenotype is known as reverse genetics.
CRISPR-based gene knockout is a powerful tool for understanding the genetic basis of disease and for developing new therapies. It is important to note that CRISPR-based gene knockout, like any genetic engineering technique, has the potential to produce unintended or harmful effects on the organism, so it should be used with caution.
Human Nature is a film documentary which presents an in-depth description of the gene editing process of CRISPR, and its possible implications.The film includes the perspective of the scientists who invented the process, and of the genetic engineers who are applying the process.