Abstract
Clusters of regularly interspaced short palindromic repeats (CRISPR) and CRISPR associated proteins (Cas) system (CRISPR-Cas) is a rapidly evolving field of targeted genome engineering. The type II CRISPR-Cas9 is used for genome editing of many organisms. Single guide RNA (sgRNA) can bind to Cas9 protein that can target desired sequences in presence of protospacer adjacent motif (PAM) sequences. This complex binds and generate a DSB that is repaired by NHEJ or HDR pathways, subsequently gene insertion/deletion (Indels) is generated that leads to change in the organism's genotype followed by its phenotype. In this chapter, CRISPR-mediated targeted genome editing in different lower organisms has been highlighted to promote its basic understanding to be applied for biotechnological, biomedical and therapeutic applications.
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