{"id":1845,"date":"2023-10-17T13:50:25","date_gmt":"2023-10-17T13:50:25","guid":{"rendered":"https:\/\/www.idtdna.com\/page\/crispr-cas9-what-are-the-pros-and-cons"},"modified":"2025-08-22T16:23:19","modified_gmt":"2025-08-22T16:23:19","slug":"crispr-cas9-what-are-the-pros-and-cons","status":"publish","type":"post","link":"https:\/\/www.idtdna.com\/page\/support-and-education\/decoded-plus\/crispr-cas9-what-are-the-pros-and-cons\/","title":{"rendered":"CRISPR-Cas9: What are the pros and cons?"},"content":{"rendered":"

What is CRISPR-Cas9?<\/h2>\n

CRISPR-Cas9 is a gene editing technology that has a wide range of applications from modifying the genomes of plants to make them more resistant to pathogens [1]<\/a> to genomic medicine research applications [2-4]<\/a>.<\/p>\n

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats, which are a group of short DNA sequences found in the genomes of some archaea and bacteria that function as a defense mechanism [5,6]<\/a>. When these repetitive segments of DNA are transcribed into RNA called crRNAs, they are complimentary to matching segments of DNA sequences found in invading viruses. The crRNAscan form a complex with a specialized CRISPR nuclease<\/a>, (e.g., Cas9). This ribonucleoprotein (RNP) complex is able to bind and cleave the target DNA, rendering it inactive [6]<\/a>.<\/p>\n

In nature, the Cas9 nuclease binds to a two-part RNA – a crRNA and a trans-activating CRISPR RNA (tracrRNA). Researchers can use modified versions of Cas9 proteins<\/a> in combination with synthetically generated RNAs to target specific genes, allowing them to better understand the functionality of a gene or to edit genes that may result in a pathological phenotype [3, 7-9]<\/a>. Figure 1 shows how DNA is cleavage by the CRISPR-Cas9 system using either a two-part guide RNA or a sgRNA.<\/p>\n

\"CRISPR
DNA cleavage by the CRISPR-Cas9 system. (A) Cas9 with two-part guide RNA. The guide RNA forms a complex with Cas9 endonuclease to guide targeted cleavage of genomic DNA. The cleavage site is specified by the spacer element of the crRNA. The crRNA spacer element recognizes 19 or 20 nt on the strand opposite from the NGG PAM (protospacer adjacent motif) site. The PAM site must be present immediately downstream of the protospacer for cleavage to occur. (B) Cas9 with single-guide RNA. The single-guide RNA (sgRNA) approach uses a fused crRNA and tracrRNA, but otherwise the entire Cas9 system works like the two-part guide RNA system shown in panel A.<\/figcaption><\/figure>\n<\/p>\n

CRISPR-Cas9 pros and cons<\/h2>\n

CRISPR-Cas9 is one of many gene editing technologies available to researchers. While it can be an extremely industrious approach for inducing changes to genetic material, it, like any other gene editing application, has several advantages and disadvantages that should be taken into consideration when designing an experiment.<\/p>\n

Pros<\/h3>\n