TSNAX (translin-associated factor X) is a nuclear and cytoplasmic protein that functions as an endonuclease in combination with translin (TSN) to process small interfering RNAs and activate the RNA-induced silencing complex (RISC) 1. The gene undergoes intergenic splicing with the adjacent DISC1 gene on chromosome 1.1, producing both TSNAX-DISC1 fusion proteins and bicistronic transcripts encoding truncated isoforms 1. Beyond its established role in RNA silencing pathways, TSNAX has significant psychiatric disease associations. Genetic polymorphisms in TSNAX are associated with major depressive disorder (MDD) susceptibility and citalopram treatment efficacy 2, bipolar affective disorder 3, and cognitive dysfunction in schizophrenia patients, with specific SNPs influencing performance on attention and memory tasks 4. TSNAX also contributes to spermatogenesis; the TSNAX-interacting protein TSNAXIP1 is essential for proper sperm head morphogenesis and male fertility 5. Additionally, dysregulation of TSNAX-DISC1 chimeric expression has been identified in endometrial carcinoma, where aberrant formation correlates with altered progesterone signaling 6. These findings establish TSNAX as a pleiotropic gene influencing psychiatric vulnerability, cognitive function, reproductive physiology, and potentially cancer development.