MXD1 (MAX dimerization protein 1) is a transcriptional repressor that forms complexes with MAX to regulate gene expression by binding to core DNA sequences 5'-CAC[GA]TG-3' 1. MXD1 antagonizes MYC transcriptional activity through competitive binding for MAX, and represses telomerase expression by binding to the TERT promoter 12. In disease contexts, MXD1 plays diverse roles across multiple pathways. In pancreatic cancer, MXD1 acts as a cofactor with histone methyltransferase MLL1 to increase H3K4 trimethylation at transposable elements, leading to trametinib resistance through viral mimicry response activation 3. MXD1 regulates inflammatory responses during influenza infection by directly binding to the CXCL10 promoter and controlling chemokine expression in a MEK1/2-dependent manner 4. In cardiovascular disease, MXD1 is targeted by miR-210-3p and miR-582-5p, with its overexpression promoting ferroptosis in hypoxic cardiomyocytes 5. MXD1 expression is regulated through multiple mechanisms including m6A RNA methylation, which affects its stability and cellular localization 67. The protein shows differential expression patterns in aging adipose tissue and various cancer types, suggesting broad roles in cellular homeostasis and disease progression 8.