{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T19:33:45Z","timestamp":1790451225830,"version":"4.1.0"},"reference-count":81,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Aging"],"abstract":"<jats:p>Mitochondrial transcription factor A (TFAM) is a nuclear-encoded mitochondrial protein that directly binds mitochondrial DNA (mtDNA) and contributes to mitochondrial genome maintenance. Beyond its established roles in mitochondrial transcription, mtDNA packaging, nucleoid organization, replication support, and copy number control, TFAM is increasingly recognized as a potential regulator of aging-related mitochondrial stress responses. Because mtDNA instability, respiratory dysfunction, reactive oxygen species imbalance, impaired autophagy, cellular senescence, and chronic inflammation are closely interconnected during aging, TFAM may occupy a proximal position linking mitochondrial genome homeostasis to broader aging biology. However, TFAM should not be viewed as a uniformly protective factor. Its effects appear to depend on TFAM abundance, TFAM-to-mtDNA stoichiometry, tissue type, metabolic state, mitochondrial import, LONP1-mediated turnover, and mitochondrial quality-control capacity. TFAM deficiency may compromise mtDNA maintenance, impair oxidative phosphorylation, increase mitochondrial ROS production, and promote mtDNA-driven innate immune activation. Conversely, excessive or dysregulated TFAM accumulation may lead to mtDNA hypercompaction, reduce mtDNA accessibility, and potentially produce maladaptive effects in specific disease contexts. In this review, we discuss the structural basis of TFAM\u2013mtDNA interaction, the role of TFAM in mtDNA transcription, copy number control, genome protection, damage handling, inflammatory signaling, cellular senescence, systemic aging, and age-related diseases. We also highlight therapeutic opportunities, limitations, and unresolved questions, emphasizing that future strategies should aim to restore TFAM homeostasis rather than simply increase TFAM expression.<\/jats:p>","DOI":"10.3389\/fragi.2026.1830839","type":"journal-article","created":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T05:45:11Z","timestamp":1782279911000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Mitochondrial transcription factor A: linking mtDNA maintenance, mitochondrial stress responses, and inflammaging"],"prefix":"10.3389","volume":"7","author":[{"given":"Nengneng","family":"Shi","sequence":"first","affiliation":[{"name":"Health Science Center, Ningbo University","place":["Ningbo, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaojing","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Gerontology, The Affiliated Hospital of Ningbo University","place":["Ningbo, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,6,24]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"2495","DOI":"10.14336\/AD.2025.10731","article-title":"Mitochondrial dysfunction in aging and age-related disorders","volume":"16","author":"Adlimoghaddam","year":"2025","journal-title":"Aging Disease"},{"key":"B2","doi-asserted-by":"publisher","first-page":"283","DOI":"10.1016\/j.tibs.2013.03.006","article-title":"Accessorizing the human mitochondrial transcription machinery","volume":"38","author":"Bestwick","year":"2013","journal-title":"Trends Biochem. 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