TFAM (transcription factor A, mitochondrial) is a critical transcriptional regulator that binds to mitochondrial DNA (mtDNA) and functions as part of the mitochondrial transcription initiation complex to enable basal transcription of mitochondrial genes 1. The protein bends mitochondrial promoter DNA through its HMG box domains and is required for maintenance of normal mtDNA levels and mitochondrial function. Beyond its classical transcriptional role, TFAM serves as an autophagy receptor that limits inflammation by binding cytoplasmic mtDNA through its LC3-interacting region (LIR) motif, facilitating autophagic clearance of leaked mtDNA via a process termed nucleoid-phagy 2. TFAM activity is regulated by post-translational modifications, including SIRT3-mediated deacetylation that enhances its transcriptional function 3. The protein's expression is controlled by DNA methylation regulators DNMT3A and TET2, and its deficiency can trigger inflammatory responses through cGAS signaling 4. TFAM dysfunction is associated with mitochondrial DNA depletion syndrome and has implications in cancer metastasis, where TFAM loss promotes nuclear actin assembly and enhances metastatic potential 5. During spermatogenesis, TFAM relocalization from mitochondria to nucleus correlates with mtDNA elimination, contributing to maternal inheritance patterns 6.