Targeting non-coding RNAs with the CRISPR/Cas9 system in human cell lines.

Area of Science:

• Molecular Biology
• Genetics
• Gene Editing

Background:

• CRISPR/Cas is a powerful genome-editing tool, primarily used for protein-coding genes.
• Knocking out non-coding genes is challenging due to the lack of open reading frames and potential for functional redundancy, especially in polyploid human cell lines.

Purpose of the Study:

• To investigate the applicability of CRISPR/Cas genome editing for the functional knockout of non-coding genes in human cell lines.
• To develop and optimize strategies for efficient non-coding gene targeting using CRISPR/Cas technology.

Main Methods:

• Utilized a homologous recombination (HR) selection system for marker gene integration.
• Constructed a dual guide RNA vector to enable simultaneous double-strand breaks for large fragment deletion.
• Employed suppression of the non-homologous end joining (NHEJ) pathway to enhance HR-mediated targeting efficiency.

Main Results:

• Successfully generated knockouts for multiple non-coding RNAs (miR-21, miR-29a) and long non-coding RNAs (lncRNA-21A, UCA1, AK023948) in various human cell lines.
• Demonstrated that HR-mediated targeting efficiency is improved by suppressing the NHEJ pathway.
• Validated the feasibility of CRISPR/Cas-mediated knockout for diverse non-coding genetic elements.

Conclusions:

• The CRISPR/Cas system, when combined with HR and NHEJ suppression, is a feasible and effective tool for knocking out non-coding genes in human cell lines.
• This approach overcomes previous limitations in targeting non-coding genomic regions, expanding the utility of genome editing.
• The developed methods provide a robust platform for functional studies of non-coding RNAs and lncRNAs.