Can single-cell RNA clocks tell how old your immune system is?
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.
Source
Single-cell immune aging clocks reveal inter-individual heterogeneity during infection and vaccination
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
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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.
What they did
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.
What they found
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.
The limits
What it doesn't show
Clock residuals are not a proven clinical diagnostic, and observational COVID/vaccine applications cannot prove that changing interferon genes would reverse immune aging.
Key terms
- sc-ImmuAging
- Cell-type-specific single-cell RNA aging clocks for circulating immune cells.
- Biological immune age
- Clock-predicted age versus chronological age (R, RMSE, MAE).
- Age acceleration
- Predicted age older than chronological age; seen in monocytes during COVID-19.
- Inflammaging
- Age-related inappropriate systemic inflammation plus reduced immune responsiveness.
- BCG
- Bacillus Calmette–Guérin vaccine; associated with heterogeneous CD8+ rejuvenation.
- PBMC
- Peripheral blood mononuclear cells used for scRNA-seq clocks.
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Clocks were trained on about:
Common questions
How many healthy people trained the clocks?
1,081 adults aged 18–97 (864/217 train/test split).
What happened in COVID-19 monocytes?
Age acceleration that decreased during recovery.
Who showed CD8+ rejuvenation after BCG?
People with elevated baseline interferon response genes.
What data type?
Single-cell RNA-seq of PBMCs.
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