ImmunogeneticsJul 28, 2026

Genetic links between aging immune cells and immune system decline

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Aug 3, 2026

Abstract

Inherited genetic variations may influence immune aging and susceptibility to diseases.

Immunosenescence involves changes in immune function due to aging, leading to higher risks of infections and chronic diseases.
Genetic predisposition may modulate the immune aging process through variations in cytokine-regulatory pathways, affecting signaling molecules like IL-6 and TNF-α.
Differences in immune signaling pathways, such as KIR-HLA interactions and DNA-sensing mechanisms, could alter immune cell activation and differentiation.
Genetic factors related to mitochondrial function and autophagy may lead to increased oxidative stress and immune cell aging.
Variations affecting folate metabolism and DNA repair processes are associated with cellular aging and instability in immune cells.
Molecular and cellular biomarkers, including inflammatory signals and telomere shortening, can indicate the status of immune aging.

Simplified

Immunosenescence is a complex biological process characterized by progressive remodeling of immune function during aging, leading to increased susceptibility to infections, chronic inflammatory diseases, cancer, and reduced vaccine efficacy. While cumulative antigen exposure, infections, lifestyle factors, environmental exposures, and epigenetic influences contribute to immune decline, a growing body of evidence suggests that genetic predisposition also plays an important modulatory role in shaping the molecular trajectory of immune aging. This review discusses how inherited variation in cytokine-regulatory pathways may influence IL-6, TNF-α, interferon, and TGF-β signaling, thereby contributing to inflammatory set points that favor chronic immune activation and inflammaging. Inherited differences in innate and adaptive immune signaling, including KIR-HLA interactions, DNA-sensing pathways, and downstream JAK-STAT and NF-κB cascades, may alter activation thresholds and immune-cell differentiation. Variants affecting mitochondrial redox balance and autophagy may enhance reactive oxygen species accumulation and metabolic exhaustion, thereby potentially contributing to immune-cell senescence. Genetic factors affecting folate metabolism, epigenetics, telomeres, and DNA repair drive epigenetic drift, cellular aging, and clonal instability in immune cells. These mechanisms appear as measurable molecular and cellular biomarkers, including inflammatory signals, immune cell activation, oxidative stress, telomere shortening, and multi-omic indicators. Understanding this molecular architecture provides a foundation for identifying predictive biomarkers and developing precision strategies to preserve immune competence and promote healthy aging.

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PubMed

Genetic links between aging immune cells and immune system decline

Abstract

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