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For several decades, genome engineering has raised interest among many researchers and physicians in the study of genetic disorders and their treatments. Compared to its predecessors, zinc-finger nucleases (ZFN) and transcription activator-like effectors (TALEN), clustered regularly interspaced short palindromic repeats (CRISPR/Cas9) is currently the most efficient molecular tool for genome editing. This system, originally identified as a bacterial adaptive immune system, is capable of cutting and modifying any gene of a large number of living organisms. Numerous trials using this technology are being developed to provide effective treatment for several diseases, such as cancer, cardiovascular and ophthalmic disorders. In research, this technology is increasingly used for genetic disease modelling, providing meaningful models of relevant studies as well as a better understanding of underlying pathological mechanisms. Many molecular tools are now available to put this technique into practice in laboratories, and despite the technical and ethical issues raised by manipulation of the genome, CRIPSR/Cas9 offers a new breath of hope for therapeutic research around the world., (Copyright © 2023 Elsevier Masson SAS. All rights reserved.)