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Genome editing, or genome engineering, or gene editing, is a type of genetic engineering in which DNA is inserted, deleted, modified or replaced in the genome of a living organism. Unlike early genetic engineering techniques that randomly inserts genetic material into a host genome, genome editing targets the insertions to site-specific locations.
Workflow of genome editing of Your Favorite Gene (YFG) using TALEN. The target sequence is identified, a corresponding TALEN sequence is engineered and inserted into a plasmid. The plasmid is inserted into the target cell where it is translated to produce the functional TALEN, which enters the nucleus and binds and cleaves the target sequence.
Genome editing uses artificially engineered nucleases that create specific double-stranded breaks at desired locations in the genome. The breaks are subject to cellular DNA repair processes that can be exploited for targeted gene knock-out, correction or insertion at high frequencies.
CRISPR-Cas9 genome editing techniques have many potential applications. The use of the CRISPR-Cas9-gRNA complex for genome editing [10] was the AAAS's choice for Breakthrough of the Year in 2015. [11] Many bioethical concerns have been raised about the prospect of using CRISPR for germline editing, especially in human embryos. [12]
Its small genome and short life cycle makes it easy to manipulate and it contains many homologs to important crop species. [5] It was the first plant sequenced , has abundant bioinformatic resources and can be transformed by simply dipping a flower in a transformed Agrobacterium solution.
CRISPR gene editing is a revolutionary technology that allows for precise, targeted modifications to the DNA of living organisms. Developed from a natural defense mechanism found in bacteria, CRISPR-Cas9 is the most commonly used system, that allows "cutting" of DNA at specific locations and either delete, modify, or insert genetic material.
Genome editing is characterised by making small edits to the genome at a specific location, often following cutting of the target DNA region by a site-specific-nuclease such as CRISPR. [12] Genetic modification usually describes the insertion of a transgene (foreign DNA, i.e. a gene from another species) into a random location within the genome.
In April 2015, gene editing technology was used on human embryos and debate about the ethics of such actions persisted since. [22] Nonetheless, scientists and policymakers are in agreement that public deliberations should decide the legality of germ line genome editing. [23]
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