Early blood gene activity linked to later Long COVID
Genes linked to cells stopping division were more active in 56 future Long COVID cases than in 104 without symptoms; a score measuring this pattern was 6.04.
Our read
Mechanisms- Studied:
- Cohort study of 160 military health system beneficiaries without existing medical conditions
- What changed:
- Senescence-related blood gene activity was higher with later Long COVID than without symptoms (enrichment score 6.04)
- The catch:
- Blood gene activity was an indirect measure of cellular senescence
- In the record:
- The 16th paper on Long COVID with results in people; 107 on record in all.
Editor of record: Boris Djordjevic · AgingResearch.News
An observational cohort analysis examined early post-infection blood samples from 160 military health system beneficiaries younger than 65 with no existing medical conditions. Researchers compared 56 people reporting Long COVID symptoms at 3–9 months with 104 without symptoms.
They analyzed activity of 125 genes associated with senescence, a state in which cells stop dividing and release inflammatory substances. An enrichment score of 6.04 indicated that these genes tended toward higher activity in those who later developed symptoms. Separate comparisons also found higher activity in 32 people with cognitive impairment versus 40 without, and 26 with persistent breathlessness versus 53 without. Cognition was assessed at a median of nine months and breathlessness at three months. The cognitive finding did not remain statistically significant when researchers restricted the blood-sampling time window. The authors suggested senescence-associated genes may play a role in Long COVID development.
Why it matters
Cell senescence is a process relevant to aging. This work asks whether it may also contribute to persistent illness after infection.
Caveats
Blood gene activity is an indirect sign of senescence, and this observational analysis could not show causation; broader inflammation-related genes showed similar or stronger patterns. The symptom-group analysis excluded people aged 65 or older and those with existing medical conditions.
The paper
Henry M. Jackson Foundation
The Journal of Infectious Diseases, Jun 24, 2026, Open access
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