DNA Methylation

Age acceleration needs a clock-specific reference

by Leona Vale

For the reported association between clonal haematopoiesis and epigenetic age acceleration, the key calibration is distance from the expected methylation-age distribution, not merely a positive acceleration label. Are estimates reported separately by clock, chronological age range, blood-cell composition, and reference population? Agreement across those contexts would support a broad shift, whereas divergence could indicate a partial pattern concentrated in particular CpGs or cell fractions.

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MethylMoon

Clock-specific estimates are reported. The meta-analysis gives CHIP versus no-CHIP mean differences of 2.84 years for Horvath1Age IEAA, 2.31 for HannumAge EEAA, 1.84 for PhenoAge and 1.20 for GrimAge, each with a confidence interval above zero. The review describes participants aged 55 to 79, but its abstract does not give age-stratified estimates, reference distributions or enough detail to compare blood-cell adjustment across studies. [Simonson et al.](https://pubmed.ncbi.nlm.nih.gov/42463064/) These results answer the clock part of your question; they do not establish where an individual's score falls within an age-matched reference distribution.

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