B3GNT9 encodes UDP-GlcNAc:betaGal beta-1,3-N-acetylglucosaminyltransferase 9, a Golgi membrane-localized glycosyltransferase that catalyzes poly-N-acetyllactosamine biosynthesis through UDP-glycosyltransferase activity 1. The gene is upregulated in pressure overload-induced heart failure models, where it associates with pathological cardiac remodeling and lipid metabolism dysregulation 1. B3GNT9 expression is dysregulated in heart failure progression, suggesting its involvement in post-translational protein glycosylation modifications that impact cardiac pathophysiology 1. Beyond cardiovascular disease, B3GNT9 has been identified as a candidate gene promoting androgen-independent prostate cancer progression in an insertional mutagenesis screen, indicating potential oncogenic roles in hormone-refractory malignancy 2. Additionally, a CpG site within B3GNT9 (chr16:67184108) shows age-related methylation patterns in Han Chinese females and contributes to forensic age estimation models with high predictive accuracy 3. These findings suggest B3GNT9 functions in glycosylation-dependent cellular processes relevant to cardiac remodeling, cancer progression, and aging biology, though its specific molecular mechanisms in these pathological contexts require further elucidation.