rs2253310 — FOXO3

FOXO3's East Asian Longevity Signal — An Intronic eQTL With Brain Expression Effects

FOXO3 is the most replicated human longevity gene, with protective variants confirmed across European, Asian, and African populations. While the well-characterized rs2802292 G-allele (the HSF1-binding enhancer variant) has been studied primarily in Western and Japanese-American cohorts, rs2253310 captures a distinct signal that may be especially informative for East Asian populations: here, the longevity-protective C allele is the minority allele (~27% in Japanese), while the less-favorable G allele predominates (~73%). This reversed frequency pattern makes rs2253310 a particularly useful genetic marker for East Asian longevity research.

A 2022 longitudinal study¹¹ A 2022 longitudinal study
Ji JS, Liu L, Yan LL, Zeng Y. Comparing Effects of FOXO3 and Residing in Urban Areas on Longevity: A Gene-Environment Interaction Study. J Gerontol A Biol Sci Med Sci. 2022 followed 3,085 Chinese older adults and found CC homozygotes had a 19% lower mortality hazard compared to GG homozygotes (HR 0.808, 95% CI 0.667–0.978), a magnitude comparable to the survival benefit of urban versus rural residence in the same cohort.

The Mechanism

rs2253310 sits in intron 2 of FOXO3 at chromosomal position 108,567,389 (GRCh38, chromosome 6). The gene is on the plus strand, so no strand-complementing is needed — genome files report the same alleles used in publications. The variant does not alter FOXO3 protein sequence; instead, it acts as an [expression quantitative trait locus (eQTL) | a variant that affects how much of a gene product is made, without changing the protein structure], influencing FOXO3 transcription.

A meta-analysis of four longevity cohorts²² A meta-analysis of four longevity cohorts
Bae H, Gurinovich A, Malovini A, et al. Effects of FOXO3 Polymorphisms on Survival to Extreme Longevity in Four Centenarian Studies. J Gerontol A Biol Sci Med Sci. 2018 found that among all 17 tested FOXO3 variants, rs2253310 and rs6911407 showed the most significant effects on FOXO3 expression in brain tissue — a key finding given FOXO3's role in neuronal stress resistance, autophagy, and protection against age-related neurodegeneration.

The rs2253310 G allele's adverse biological direction was confirmed by a 2025 Russian study (n=1,365) showing GG homozygotes face nearly double the risk of chronic obstructive pulmonary disease (OR 1.99, p = 5.93×10⁻⁷) , consistent with lower FOXO3-mediated antioxidant defense in lung tissue of G-allele carriers.

The Evidence

Three independent Chinese longitudinal cohort studies using the Chinese Longitudinal Healthy Longevity Survey demonstrate consistent protective effects of the rs2253310 C allele:

Liu et al. 2021³³ Liu et al. 2021
Liu L, Zhu A, Shu C, Zeng Y, Ji JS. Gene-Environment Interaction of FOXO and Residential Greenness on Mortality Among Older Adults. Rejuvenation Res. 2021 studied 3,179 adults aged 65 and older, finding CC homozygotes had an HR of 0.803 (95% CI 0.666–0.968) for all-cause mortality. Notably, the protective effect of residential greenness was amplified in C-allele carriers, suggesting gene-environment synergy in FOXO3 activation.

Ji et al. 2022 cognitive study⁴⁴ Ji et al. 2022 cognitive study
Ji JS, Liu L, Zeng Y, Yan LL. Effect of FOXO3 and Air Pollution on Cognitive Function. J Gerontol A Biol Sci Med Sci. 2022 tracked cognitive function over 14 years and found C-allele homozygotes had higher baseline MMSE scores and lower odds of cognitive impairment over time. The cognitive protection was strongest in women, older adults, and those in lower air-pollution environments, suggesting that the C allele's FOXO3 expression boost matters most when cellular stress is high.

The blood pressure findings from Morris et al. 2016 add a cardiovascular dimension: among 843 Japanese Americans, women carrying two C alleles had 6 mmHg lower systolic and 3 mmHg lower diastolic blood pressure than GG homozygotes, with essential hypertension prevalence of 3.3% vs 9.5% (P = 0.03–0.04). This gender specificity echoes the pattern seen with other FOXO3 longevity variants, where protective effects are often stronger in women.

Practical Implications

The practical takeaways from rs2253310 mirror those of other FOXO3 longevity variants — all of them point toward the same lifestyle levers for activating FOXO3 expression: fasting, exercise, and stress management. The unique contribution of rs2253310 is its cognitive aging signal: the C allele's strongest effects appear in brain tissue eQTLs, suggesting that brain health across the lifespan may be particularly relevant to this variant.

For GG homozygotes — especially prevalent in East Asian populations — the cognitive aging data suggest that interventions targeting neurological resilience deserve particular emphasis: regular aerobic exercise (which strongly activates FOXO3 in neural tissue), sleep optimization (FOXO3 expression cycles with circadian rhythms), and minimizing chronic oxidative stressors such as air pollution exposure and smoking.

Interactions

rs2253310 lies in the same FOXO3 intron 2 region as rs2802292 and is in high linkage disequilibrium with the broader FOXO3 longevity haplotype. In East Asian populations, the LD pattern differs from European cohorts — rs2253310's C allele is uncommon where rs2802292's G allele may be more common, meaning the two variants may be partially independent signals in Asian ancestries, which could explain rs2253310's distinct detection in Chinese cohort studies rather than primarily in European studies.

The gene-environment interactions documented for rs2253310 — with residential greenness, urban living, and air pollution — are not replicated for most other FOXO3 variants, suggesting this particular intronic position may regulate FOXO3 expression in response to environmental oxidative stress in a way that differs mechanistically from the HSF1-dependent rs2802292 enhancer.