Gene expression
Can single-cell RNA clocks tell how old your immune system is?
Open access · cc by · source: Europe PMC
sc-ImmuAging clocks trained on 1,081 healthy adults’ PBMCs showed monocyte age acceleration in COVID-19 that eased with recovery, and CD8+ T-cell rejuvenation after BCG mainly in people with high baseline interferon genes.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
A reversible marker that moves with recovery is a different and harder thing to build than a survival score.
Signatures can be built to track state rather than outcome. Single-cell immune aging clocks passed internal and external validation, showed monocyte age acceleration in COVID-19 patients that decreased during recovery, and marked heterogeneous vaccination responses by baseline interferon gene expression.
Evidence for the claim as stated.
What counts as validation differs sharply across this literature. The immune aging clocks report internal and external validation on independent data, while the single-gene cancer markers are assessed within the same public repositories used to select them — so the reported AUCs and hazard ratios are not measuring the same property.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
What counts as validation differs sharply across this literature. The immune aging clocks report internal and external validation on independent data, while the single-gene cancer markers are assessed within the same public repositories used to select them — so the reported AUCs and hazard ratios are not measuring the same property.
Study at a glance
- Design
- Computational / modelling — Cell-type-specific scRNA-seq aging clocks (sc-ImmuAging) trained on 1,081 healthy adults then applied to COVID-19 and BCG vaccination transcriptomes
- N
- N=1081 · 1,081 healthy European adults (18–97 years); 864 train / 217 internal validation plus external tests and disease/vaccine applications
- Population
- Healthy adult PBMC scRNA-seq donors, with separate COVID-19 patient and BCG vaccinee applications
- Outcome
- Predicted immune biological age vs chronological age (R, RMSE, MAE) and age acceleration in monocytes and CD8+ T cells
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Can single-cell RNA clocks tell how old your immune system is?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
1,081 healthy individuals aged 18–97 years.
using single-cell RNA-sequencing data from 1,081 healthy individuals aged from 18 to 97 years.
80% (864) training and 20% (217) internal validation.
80% (864 individuals) were randomly selected for model training, while the remaining 20% (217 individuals) constituted the internal validation set.
Key findings
Internal and external validation favored the constructed models. COVID-19 patients showed monocyte age acceleration that decreased during recovery. Vaccination effects were heterogeneous: elevated baseline interferon response genes marked CD8+ T-cell age rejuvenation after BCG.
Methodology
Built cell-type-specific transcriptomic clocks for circulating myeloid and lymphoid cells from 1,081 European healthy adults (18–97). Split 80/20 (864/217) for training/internal validation, then applied clocks to COVID-19 and BCG vaccination datasets.
Limitations
Clock residuals are not a proven clinical diagnostic, and observational COVID/vaccine applications cannot prove that changing interferon genes would reverse immune aging.
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