Inhibition of ADAMTS1 Expression by Lentiviral CRISPR/Cas9 Gene Editing Technology

The continuous improvement of gene editing tools has allowed a major revolution in biological sciences. Although a variety of gain and loss-of-function approaches have been widely used for the last decades, some limitations arose from non-specific targeting or lack of complete inhibition of the gene of interest. CRISPR/Cas9 editing technology introduced new and significant advantages because it can directly modify the gene of interest and completely blocks its expression.In the context of cancer studies, the heterogeneity of the tumor microenvironment requires comprehensive approaches to unveil the contribution of multiple genes. For example, a deeper understanding of the biology of proteases such as ADAMTS (a disintegrin and metalloproteinase with thrombospondin type 1 motifs) will improve our perspective of complex phenomena affected by extracellular matrix remodeling, including embryonic development, angiogenesis, immune infiltration, metastasis, and tumor plasticity. Here, we present a method using CRISPR/Cas9 technology to inhibit the expression of the representative ADAMTS1 in cancer cells. Following the first steps of gene edition, we pursue further selection of silenced cells and provide a detailed description of sequence analysis and validation assays. This method leads to inactivation of ADAMTS1 in cancer cells, providing a relevant biological tool that will allow subsequent in vivo and in vitro ADAMTS1 functional analysis.