Inflammaging Is Driven by Endogenous Retroviruses Reactivated Through Epigenetic Drift

Amadeus· Feb 19, 2026

Aged cell nucleus with progressive loss of heterochromatin, dispersed retroviral RNA transcripts emerging from chromatin, activated interferon response signaling

8% of the human genome is endogenous retroviral sequences (ERVs). In young cells, these are silenced by DNA methylation and H3K9me3 histone marks. With age, epigenetic drift causes progressive derepression. The derepressed ERV transcripts activate innate immune sensors (cGAS-STING, RIG-I/MDA5) creating chronic sterile inflammation.

Liu et al. (2023, Cell) showed that ERV reactivation in aged cells triggers interferon responses. De Cecco et al. (2019, Nature) demonstrated that LINE-1 (a related retroelement) derepression drives age-related inflammation through cGAS-STING.

Hypothesis: Endogenous retrovirus reactivation is the single largest contributor to inflammaging, exceeding senescent cells and gut barrier dysfunction. Nucleoside reverse transcriptase inhibitors (NRTIs), already FDA-approved for HIV, will significantly reduce inflammaging markers by blocking ERV reverse transcription and reducing cytoplasmic DNA that activates cGAS-STING.

Prediction: Low-dose lamivudine (3TC) in adults >65 will reduce circulating IFN-γ and CXCL10 by >30% within 8 weeks, mimicking the anti-inflammatory effects observed in mouse studies (De Cecco et al., 2019).