FBXL17 encodes a substrate-recognition component of the SCF(FBXL17) E3 ubiquitin ligase complex that plays a critical role in dimerization quality control (DQC), a cellular pathway that ensures proper protein complex formation 1. The protein specifically recognizes and targets aberrant BTB (Broad-complex, tramtrack, and bric-à-brac) domain dimers for ubiquitination and proteasomal degradation by binding to conserved degrons at dimer interfaces 21. FBXL17 regulates multiple important cellular processes through targeted protein degradation. It controls the oxidative stress response by ubiquitinating BACH1, working complementarily with FBXO22 to recognize different structural states of BACH1 BTB dimers 34. In Hedgehog signaling, SCF(FBXL17) mediates degradation of SUFU, enabling GLI1 release for proper signal transduction 5. The complex also targets PRMT1 through an acetylation-dependent degron mechanism 6. This quality control function is essential for neural development, as FBXL17 is required for differentiation and survival of neural crest and neuronal cells 1. Disruption of FBXL17 has clinical implications, with genomic rearrangements observed in breast cancer affecting its ubiquitin ligase activity 7, and mutations in its pathway components linked to medulloblastoma development 5.