Abstract
The emergence of genome editing technology based on the CRISPR/Cas system enabled revolutionary progress in genetic engineering. Double-strand breaks (DSBs), which can be induced by the CRISPR/Cas9 system, cause serious DNA damage that can be repaired by a homologous recombination (HR) system or the nonhomologous end joining (NHEJ) pathway. However, many bacterial species have a very weak HR system. Thus, the NHEJ pathway can be used in prokaryotes. Starting with a brief introduction of the mechanism of the NHEJ pathway, this review focuses on current research and details of applications of NHEJ in eukaryotes, which forms the theoretical basis for the application of the NHEJ system in prokaryotes.
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