Gene-of-interest knockout organoids present a powerful and versatile research tool to study a gene's effects on many biological and pathological processes. Here,we present a straightforward and broadly applicable protocol to generate gene knockouts in mouse organoids using CRISPR-Cas9 technology. We describe the processes of transient transfecting organoids with pre-assembled CRISPR-Cas9 ribonucleoprotein complexes,organoid cell sorting,and establishing clonal organoid culture pairs. We then detail how to confirm the knockout via Western blot analysis.
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