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Observational data from China, the United States, France, and Italy suggest that chronological age is an adverse COVID outcome risk factor, with older patients having a higher severity and mortality rate than younger patients. Most studies have gotten the same view. Epigenetic clocks and telomere length were used as biological indicators of aging. Firstly, epigenetic age and telomere length were used as exposures, and following a screen for appropriate instrumental variables, we used random-effects inverse variance weighting IVW for the main analysis, and combined it with other analysis methods e.
For reducing false-positive rates, Bonferroni corrected significance thresholds were used. A reverse Mendelian randomization analysis was subsequently performed with COVID susceptibility and severity as the exposure. Our study provides partial evidence for the causal effects of aging on the susceptibility and severity of COVID Thus, to protect high-risk groups against COVID, risk factors associated with increased susceptibility to the disease must be identified 2.
In COVID, age is an important risk factor, and the older you get, the more severe and mortality you become 3 — 6. Other countries such as China 8 , the United States 9 , and France 10 have achieved similar results, with older COVID case fatality rates being higher than among younger patients. Not only that, but the data tested in Italy show that the total case fatality rate in Italy is higher than that in China 7. Aging-related biological processes are reflected in molecular hallmarks such as epigenetic modifications and telomere attrition 11 — Epigenetic age has recently emerged as a promising indicator of cellular senescence and may be more strongly correlated with mortality than earlier indicators of biological age Different from chronological age, epigenetic age is a heritable indicator of biological aging derived from DNA methylation DNAm data.
Each indicator epigenetic clock is based on the unique characteristics of DNAm levels reflecting biological aging, as measured at a specific set of cytosine-phosphate-guanine CpG loci There are 71 age-related CpG in the blood, and HannumAge results from training on these loci. The HorvathAge is trained on the age-related CpG species found in human tissues and cells, and then further adjusts for the blood cell count.
