Mixed
Aging involves synchronized, tissue-specific gene expression changes, with vital organs like heart, lung, and blood showing strong 'co-aging' synchronization, while mitochondrial dysfunction is a central, conserved biological process across multiple tissues.
Aging is not a single event but a collection of tissue-specific molecular changes. While mitochondrial health is a common thread, the rate and nature of aging vary by organ. This suggests that interventions targeting specific tissues (e.g., cardiovascular health) may need to be tailored, as 'one size fits all' anti-aging strategies may not address tissue-specific vulnerabilities.
In general, we find the aging gene expression signatures are very tissue specific. However, enrichment for some well-known aging components such as mitochondria biology is observed in many tissues. Different levels of cross-tissue synchronization of age-related gene expression changes are observed, and some essential tissues (e.g., heart and lung) show much stronger “co-aging” than other tissues based on a principal component analysis.
Why this rating
Large-scale observational study (GTEx) with rigorous statistical controls (permutation tests, correction for confounders), though cross-sectional design limits causal inference.
Source
Synchronized age-related gene expression changes across multiple tissues in human and the link to complex diseases
Jialiang Yang et al. · Scientific Reports · 2015
DOI 10.1038/srep15145
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