Recent advances in the CRISPR genome editing tool set.

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• The clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR-associated proteins (Cas) system has transformed genome engineering.
• CRISPR-Cas systems are classified into classes 1 and 2 based on effector gene composition, with Class 2 enabling routine genome editing.

Purpose of the Study:

• To review the mechanisms and applications of Class 2 CRISPR-Cas systems (Types II, V, and VI) in genome editing.
• To highlight the methods by which CRISPR techniques induce gene expression alterations.
• To discuss current technical challenges and future potential of CRISPR technology.

Main Methods:

• Overview of Class 2 CRISPR-Cas systems (Type II, V for DNA editing; Type VI for RNA editing).
• Description of CRISPR-mediated gene expression alterations via double-stranded breakage (DSB) repair, base editing, DNA integration, and gene regulation.
• Identification of technical challenges including efficiency, off-target effects, Cas size, PAM specificity, and immunogenicity.

Main Results:

• Class 2 CRISPR-Cas systems provide versatile tools for both DNA and RNA editing.
• CRISPR techniques can induce both qualitative and quantitative changes in gene expression through various pathways.
• Significant technical hurdles remain, impacting the efficiency and specificity of genome editing applications.

Conclusions:

• CRISPR technology offers powerful capabilities for DNA rewriting with broad potential in therapeutics, diagnostics, and biotechnology.
• Addressing current limitations in efficiency, specificity, and delivery is crucial for realizing the full potential of CRISPR.
• Continued refinement of CRISPR-Cas systems will drive innovation across multiple scientific and medical fields.