TOMM40 rs71352238: What Your Genotype Means
The rs71352238 variant is a single nucleotide polymorphism located within the TOMM40 gene, which plays a critical role in mitochondrial protein transport. Research has identified this variant as a potential marker associated with human longevity and cognitive health in aging populations.
What each genotype means
Typical cognitive aging baseline
You carry two copies of the common C allele for this TOMM40 variant. Published studies associate this baseline profile with typical rates of cognitive aging and longevity, showing no enrichment for the protective longevity effect observed with the minor allele. Because TOMM40 sits in strong linkage disequilibrium with neighboring genes like APOE, individual cognitive risk is influenced by broader regional haplotypes and lifestyle factors rather than this single marker alone.
Carried by approximately 70% to 75% of individuals of European ancestry and the majority of non-European populations.
Modest longevity-associated carrier
You carry one copy of the longevity-associated T allele at this TOMM40 locus. Research suggests this allele may be linked to maintained mitochondrial membrane transport integrity and a modest relative delay in age-related cognitive decline. However, evidence remains limited and heavily correlated with adjacent APOE haplotypes, meaning this genotype does not guarantee protection against neurodegenerative changes.
Carried by approximately 24% to 26% of individuals of European ancestry; less common in East Asian populations.
Enhanced longevity-associated genotype
You carry two copies of the minor T allele in the TOMM40 gene. Statistical associations in aging cohorts suggest homozygous carriers may have improved mitochondrial protein import function and potentially lower rates of cognitive decline compared to common allele homozygotes. Because functional evidence remains limited and confounded by neighboring chromosome 19 variants, these findings describe average population patterns rather than an individual health guarantee.
Carried by roughly 2% of people of European ancestry and is rare across most other continental ancestries.
Understanding the rs71352238 Variant
The rs71352238 variant is a specific genetic change, or single nucleotide polymorphism (SNP), located within the TOMM40 gene. This gene is situated on chromosome 19, a region of the human genome that is highly significant due to its proximity to the APOE gene, which is well-known for its influence on Alzheimer's disease risk and lipid metabolism. Because rs71352238 is an intronic variant, it does not directly alter the sequence of the protein produced by the gene. Instead, it is located in a non-coding region that may influence how the gene is regulated or expressed. Scientists study such variants to understand how subtle differences in our DNA sequence might contribute to complex traits like healthy aging. While the variant is often investigated alongside other nearby SNPs in the TOMM40/APOE locus, it is specifically recognized in some studies as a candidate marker for longevity, though its precise functional impact on cellular processes remains a subject of ongoing scientific inquiry.
The Role of the TOMM40 Gene
The TOMM40 gene provides instructions for creating the TOM40 protein, which is a vital component of the Translocase of the Outer Mitochondrial Membrane (TOM) complex. Mitochondria are the powerhouses of the cell, responsible for generating the energy required for cellular function. For mitochondria to operate correctly, they must import thousands of proteins from the rest of the cell. The TOM40 protein forms the central pore of the outer mitochondrial membrane, acting as a gateway that allows these essential proteins to enter the mitochondria. When this import process is efficient, mitochondria can maintain their membrane potential, manage oxidative stress, and support overall cellular health. Dysfunction in this import mechanism has been linked to neurodegenerative processes and age-related decline. By studying variants like rs71352238, researchers aim to determine if specific genetic signatures in the TOMM40 gene influence the efficiency of this mitochondrial gateway, potentially affecting how well our cells age over time.
Research and Evidence Strength
The evidence linking rs71352238 to longevity and healthspan is currently considered limited. While several studies have identified associations between this SNP and longevity, these findings are often based on statistical correlations observed in specific cohorts rather than established biological mechanisms. For instance, some research has investigated rs71352238 alongside other variants like rs157582 and rs8106922, noting that these markers appear in studies of long-lived individuals. However, unlike more extensively studied variants in the same genomic region, there are currently no reports detailing how rs71352238 specifically influences TOMM40 RNA or protein levels. Furthermore, because this variant exists in a region with high linkage disequilibrium—meaning it is often inherited together with other nearby genetic changes—it can be difficult for researchers to isolate whether rs71352238 is the direct cause of an observed effect or simply a passenger marker. Consequently, while the association is a topic of interest in aging research, it is not currently used as a clinical diagnostic tool.
Interpreting Your Genetic Information
If you have access to your genetic data, it is important to understand that a single variant like rs71352238 does not determine your health outcomes. Longevity is a complex trait influenced by a vast interplay of thousands of genetic variants, environmental factors, lifestyle choices, and pure chance. Having a specific genotype at this location does not guarantee any particular health result, nor does it provide a roadmap for medical intervention. Because the scientific evidence for this variant is still evolving, it should be viewed as a piece of a much larger, incomplete puzzle. You cannot use this information to diagnose yourself or predict your lifespan. If you have concerns about your cognitive health, family history of disease, or general aging, the most effective approach is to consult with a qualified healthcare professional. They can provide personalized guidance based on your complete medical history and current clinical standards, rather than relying on individual genetic markers that are still being explored by the scientific community.
How common is this variant?
The minor allele frequency for this variant is approximately 0.15 in European populations, though frequencies can vary across different global ancestries.
Frequently asked questions
Is rs71352238 a test for Alzheimer's disease?
No, rs71352238 is not a diagnostic test for Alzheimer's disease. While it is located in a gene region associated with neurodegenerative research, it is not used clinically to predict or diagnose the condition.
Can I change my health outcomes based on this SNP?
No. Genetic variants like rs71352238 are fixed at birth. Health outcomes are influenced by many factors, and you should focus on evidence-based lifestyle choices like diet, exercise, and regular medical checkups.
Why is this variant linked to longevity?
Researchers study this variant because it sits in the TOMM40 gene, which is essential for mitochondrial health. Some statistical studies have found correlations between this region and longevity, but the exact biological reasons are still being researched.
Should I be worried if I have the minor allele?
No. The presence of a minor allele is a normal part of human genetic diversity. It does not imply a health risk or a medical condition, and the evidence for this specific variant is not strong enough to warrant concern.
Sources & further reading
Educational information only, last refreshed 10/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is in linkage disequilibrium with APOE and is associated with the age of onset for late-onset Alzheimer's disease.
Variant in TOMM40 associated with mitochondrial function and aging markers.
This SNP is frequently analyzed in the context of Alzheimer's disease risk and cognitive decline.