Meta-analysis on blood transcriptomic studies identifies consistently coexpressed protein-protein interaction modules as robust markers of human aging.

Module detection followed by a meta-analysis on chronological age identified fifteen consistently coexpressed PPI modules associated with chronological age, including a highly significant module ( P = 3.5 × 10 −38 ) enriched for ‘ T-cell activation ’ marking age-associated shifts in lymphocyte blood cell counts ( R 2 = 0.603; P = 1.9 × 10 −10 ).

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