PRAC2 is a small nuclear protein encoded on chromosome 17.3 that exhibits tissue-specific expression patterns with potential roles in cellular regulation and disease susceptibility. The gene is primarily expressed in prostate, rectum, distal colon, and testis, with weaker expression in placenta, peripheral blood leukocytes, and skin 1. PRAC2 encodes a 564-nucleotide transcript producing approximately a 10.5-kDa nuclear protein, and its chr17 proximity to Hoxb-13 suggests involvement in prostate growth and development 1. At the epigenetic level, PRAC2 DNA methylation patterns serve as biomarkers for cancer biology. Differential methylation of PRAC2 CpG sites (particularly cg12374721) correlates with aberrant gene expression in breast cancer and other malignancies, showing diagnostic and prognostic value especially in estrogen-receptor-positive tumors 2. PRAC2 methylation associates with survival outcomes, with elevated methylation linked to increased hazard of breast cancer-specific mortality (HR=1.67) 3. Recent studies implicate PRAC2 in developmental and metabolic pathways. Prenatal exposure to endocrine-disrupting chemicals associates with childhood obesity through altered DNA methylation at PRAC2 loci, suggesting epigenetic mediation of environmental effects on growth 4. Additionally, rare coding variants near PRAC2 were identified in longevity studies, indicating potential involvement in aging-related mechanisms 5. Dysregulated PRAC2 expression occurs in inflammatory bowel disease, with altered methylation patterns in ulcerative colitis epithelium 6.