Homologous recombination (HR) safeguards genome stability, but the regulation of HR proteins remains unclear. Here, the authors show that the compound UNI418 inhibits lipid kinases PIKfyve and PIP5K1C, reducing IP6 levels and triggering Cul4A–WDR5 dependent degradation of HR proteins, thereby suppressing HR and overcoming PARP inhibitor resistance.
- Seon-gyeong Lee
- Yuri Seo
- Kyungjae Myung