Genome editing comprises the use of customizable engineered nucleases for the genetic modification of cells. Two commonly used systems are transcription activator-like effector nucleases (TALEN) and the CRISPR/Cas system. During this study, genome editing tools were applied for the modification of three genes (JAK3, RAG1, RAG2) playing crucial roles in the immune system, with the aim of generating immunodeficient pigs.