Stable Knockout of lncRNA DANCR Gene in Mesenchymal Stem Cells with a Dual-Target CRISPR Lentiviral Vector / 中山大学学报(医学科学版)

ABSTRACT

@#【Objective】Using the CRISPR/Cas9（CRISPR/crispr-associated（Cas）9 method，a dual-target lentiviral vector containing single- guide RNAs（sgRNAs）targeting both the 5’and 3’ends of the anti- differentiation noncoding RNA（DANCR）gene was constructed. Stable knockout of DANCR gene in mesenchymal stem cells（MSC）would be helpful for the future study of the biological function of DANCR.【Methods】Designed sgRNAs targeting either the 5’or 3’ end of DANCR and cloned into two CRISPR vectors. The vector was transfected into 293FT cells，and the genomic DNA of 293FT cells was extracted to verify the efficiency of individual sequence. Two functional sgRNAs targeting either the 5’ or 3’end were incorporated into a same lentiviral CRISPR vector through gateway and enzymatic ligation. 293FT was used for lentiviral packaging，after which the virus was harvested to infect MSC，and the knockout efficiency of DANCR in MSC was detected.【Results】All four sgRNA sequences targeting DANCR successfully guided Cas9 to cleave the gene. sgRNAs targeting either the 5’and 3’end were combined to establish a dual-target lentiviral vector for stable knockout of DANCR. The vector was packaged into lentivirus and infected MSC. Finally，we successfully obtained mesenchymal stem cell lines with DANCR gene knockout.【Conclusions】Using the CRISPR method，a dual-target lentiviral vector can efficiently and stably knock out DANCR gene in MSC.