C6orf89 encodes bombesin receptor-activated protein (BRAP), which exhibits histone deacetylase (HDAC) enhancer properties and produces three distinct protein isoforms with different subcellular localizations 1. The soluble isoform localizes to the nucleolus and integrates into ribosomal gene transcription machinery, while membrane isoforms localize to the Golgi and midbody 1. BRAP plays important roles in cell cycle progression and wound repair of bronchial epithelial cells 1. The protein regulates NF-κB transcriptional activity by enhancing HDAC activity, thereby modulating immune and inflammatory responses in airway epithelium 2. In kidney disease, BRAP contributes to cisplatin-induced acute kidney injury by promoting tubular cell apoptosis and necroptosis through regulation of SIRT2 protein degradation 3. BRAP deficiency attenuates renal fibrosis by suppressing epithelial-mesenchymal transition in tubular epithelial cells 4. The protein also influences inflammatory processes in skin, with BRAP deficiency altering psoriasis-like inflammation patterns through increased TSLP release from keratinocytes 5. Additionally, C6orf89 mutations can generate tumor-specific neoantigens in chr6 lymphocytic leukemia 6, and the gene is involved in oncogenic splicing events in acute lymphoblastic leukemia 7.