For example, Heman‐Ackah et al. fused Krüppel associated box (KRAB), a transcription repressor, to the dCas9, which reversibly suppressed PD‐related gene SNCA expression in induced pluripotent stem cells (iPSC)‐derived neurons.[306] Besides, promoting neuroprotective gene expression is an alternative strategy for treating brain diseases. Here, SNCA is linked to Parkinson disease.