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By binding to the viral long terminal repeat (LTR) and hijacking host transcriptional machinery, Tat dynamically regulates RNA polymerase II processivity to alter viral transcription states. Recent studies reveal its context-dependent variability: while Tat recruits chromatin modifiers and scaffolds non-coding RNAs to stabilize epigenetic silencing in latently infected cells, it also triggers rapid transcriptional amplification upon cellular activation. This review systematically analyzes the bistable regulatory mechanism of Tat and investigates advanced technologies for reprogramming this switch to eliminateviral reservoirs and achieve functional cures. Conventional approaches targeting Tat are limited by compensatory viral evolution and poor bioavailability. Next-generation interventions will employ precision-engineered tools, such as AI-optimized small molecules blocking Tat-P-TEFb interfaces and CRISPR-dCas9\/Tat chimeric systems, for locus-specific LTR silencing or reactivation (\u201cblock and lock\u201d or \u201cshock and kill\u201d). Advanced delivery platforms, including brain-penetrant lipid nanoparticles (LNPs), enable the targeted delivery of Tat-editing mRNA or base editors to microglial reservoirs. Single-cell multiomics elucidates Tat-mediated clonal heterogeneity, identifying \u201cswitchable\u201d subpopulations for timed interventions. By integrating systems-level Tat interactomics, epigenetic engineering, and spatiotemporally controlled delivery, this review proposes a roadmap to disrupt HIV-1 persistence by hijacking the Tat switch, ultimately bridging mechanistic insights to clinical applications.<\/jats:p>","DOI":"10.3390\/ijms26136311","type":"journal-article","created":{"date-parts":[[2025,7,1]],"date-time":"2025-07-01T06:56:54Z","timestamp":1751353014000},"page":"6311","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["HIV-1 Tat: Molecular Switch in Viral Persistence and Emerging Technologies for Functional Cure"],"prefix":"10.3390","volume":"26","author":[{"given":"Kaixin","family":"Yu","sequence":"first","affiliation":[{"name":"Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518107, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanxin","family":"Liu","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518107, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7106-7312","authenticated-orcid":false,"given":"Ting","family":"Pan","sequence":"additional","affiliation":[{"name":"Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-sen University, Sun Yat-sen University, Shenzhen 518107, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"868","DOI":"10.1126\/science.6189183","article-title":"Isolation of a T-lymphotropic retrovirus from a patient at risk for acquired immune deficiency syndrome (AIDS)","volume":"220","author":"Chermann","year":"1983","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"448","DOI":"10.1172\/JCI80565","article-title":"Molecular mechanisms of HIV latency","volume":"126","author":"Cary","year":"2016","journal-title":"J. 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