ZNF865 Regulates Senescence and Cell Cycle for Applications to Cell Engineering and Gene Therapy

Zinc finger (ZNF) proteins represent the largest group of regulatory proteins within eukaryotic genomes. However, despite their broad regulatory function, the majority of ZNF protein function remains unknown. Recently, we discovered ZNF865, which has no in-depth publications and has not been functionally characterized. Utilizing CRISPR-guided gene modulation, we show that ZNF865 regulates key cellular and molecular processes associated with healthy cell function by primarily regulating cellular senescence, cell cycle progression, and protein processing. As a result, regulating this gene acts as a primary titratable regulator of cell activity, and we demonstrate the potential of targeted ZNF865 regulation as a tool to control senescence and protein production in multiple clinically relevant cell types for cell engineering/tissue engineering/gene therapy applications. We demonstrate its ability to rescue human senescent cell populations, boost T-cell activity, and dramatically deposit more cartilaginous tissue in a whole organ tissue-engineered intervertebral disc. Overall, we present novel biology and regulatory mechanisms of senescence and cell cycle that were previously unknown and display the power of CRISPR-cell engineering to enhance cell engineering strategies treating disease. ### Competing Interest Statement The authors have declared no competing interest.