TOMM40 rs2075311: Understanding the Genetic Context
The rs2075311 variant is a single-nucleotide polymorphism located within the TOMM40 gene. It is frequently studied alongside the neighboring APOE gene due to their strong linkage, which complicates efforts to determine their individual contributions to late-onset Alzheimer's disease risk.
What each genotype means
Typical genetic profile
This genotype represents the common variant at this position in the TOMM40 gene. Research into this specific SNP is limited, and its individual contribution to health outcomes remains unclear due to its close proximity to the highly influential APOE gene. You should not interpret this result as a diagnostic indicator for any condition.
This is a common genotype found across most global populations.
Typical genetic profile
This genotype represents a common variation at this position in the TOMM40 gene. Because this gene is located very close to the APOE gene on chromosome 19, it is often studied in the context of Alzheimer's disease risk, though evidence for this specific SNP's independent effect is limited and inconsistent. This result does not provide a clinical diagnosis or a definitive assessment of disease risk.
This is a common genotype found across most global populations.
Associated with potential risk
Some studies have observed a higher frequency of this genotype in individuals diagnosed with Alzheimer's disease compared to healthy controls, though other research has found no significant association. Because TOMM40 is physically linked to the APOE gene, it is difficult to determine if this variant has an independent effect or is simply inherited alongside other risk factors. This finding is not diagnostic and should be discussed in the context of your overall health history with a medical professional.
This is a common genotype found across most global populations.
What is rs2075311 and Where is it Located?
The rs2075311 variant is a specific genetic change, or single-nucleotide polymorphism (SNP), situated within the TOMM40 gene. This gene is located on chromosome 19 in a region that also contains the APOE gene, a well-known genetic factor for late-onset Alzheimer's disease. Because these genes are physically close to one another on the chromosome, they are often inherited together in blocks known as haplotypes. This phenomenon, called linkage disequilibrium, makes it scientifically challenging for researchers to isolate whether a specific health association is driven by the TOMM40 variant itself, the nearby APOE gene, or the combined effect of the entire region. Consequently, rs2075311 is often analyzed as part of a larger genetic neighborhood rather than as an isolated factor.
The Role of the TOMM40 Gene
The TOMM40 gene provides instructions for creating the Tom40 protein, which is a core component of the translocase of the outer mitochondrial membrane (TOM) complex. This complex acts as a gateway, allowing proteins to enter the mitochondria, the powerhouses of the cell. Proper mitochondrial function is essential for energy production and cellular health, particularly in high-energy tissues like the brain. Research suggests that variations in TOMM40 might influence the expression levels of this protein or the efficiency of mitochondrial import. Some studies have hypothesized that altered TOMM40 expression could contribute to mitochondrial dysfunction, a process observed in various neurodegenerative conditions. However, the exact biological mechanism linking specific TOMM40 variants to clinical outcomes remains a subject of ongoing investigation.
Research Associations and Evidence Strength
The evidence linking rs2075311 to late-onset Alzheimer's disease is considered limited and complex. While many studies have identified statistical associations between variants in the TOMM40-APOE region and Alzheimer's risk, the results are often inconsistent across different populations and study designs. Some researchers have observed that certain TOMM40 variants correlate with age of onset or cognitive performance, but these findings are frequently debated because of the strong influence of the APOE gene. It is important to note that these associations are statistical in nature, meaning they describe patterns observed in large groups of people rather than predicting individual health outcomes. Because of the high degree of genetic linkage in this region, current scientific consensus emphasizes that more research is required to clarify the independent role of TOMM40 variants.
Population Frequency
The rs2075311 variant is considered a common genetic polymorphism. Its frequency varies across different ancestral populations, which is a standard observation for many SNPs in the human genome. Because it is common, it is present in a large portion of the general population, regardless of their health status. This high frequency is one reason why researchers must use very large sample sizes to determine if the variant has any meaningful impact on disease risk, as common variants often have small individual effects that are difficult to distinguish from background genetic noise.
Interpreting Genetic Information
Genetic information regarding variants like rs2075311 should be viewed as a tool for scientific research rather than a diagnostic indicator. Because the association with Alzheimer's disease is complex and influenced by many other genetic and environmental factors, knowing your genotype for this SNP does not provide a clear prediction of your future health. There is no medical action or lifestyle change currently recommended based on this specific variant. If you have concerns about cognitive health or family history, it is best to consult with a healthcare professional or a genetic counselor. They can provide context based on your overall health profile and family history, rather than focusing on a single genetic marker that has limited clinical utility.
How common is this variant?
The rs2075311 variant is a common polymorphism found across diverse global populations, with genotype frequencies varying by ancestry.
Frequently asked questions
Does having a specific rs2075311 genotype mean I will get Alzheimer's?
No. This variant is associated with statistical risk in large population studies, but it is not a diagnostic test. Many factors, including other genes and lifestyle, contribute to Alzheimer's risk.
Is TOMM40 the same as APOE?
No, they are two different genes located very close to each other on chromosome 19. Because they are neighbors, they are often inherited together, which makes it hard to tell which one is responsible for observed health associations.
Should I get tested for rs2075311?
There is no clinical recommendation to test for this variant. Because the evidence is limited and the results do not change medical management, testing is generally not useful for individual health planning.
What can I do if I have a 'risk' genotype for this variant?
Since this variant is not a diagnostic tool, no specific actions are recommended. Focus on general brain health, such as regular exercise, a balanced diet, and cognitive engagement, and discuss any concerns with your doctor.
Sources & further reading
Educational information only, last refreshed 9/23/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the TOMM40 gene is frequently associated with mitochondrial function and healthy aging markers.
Functional intronic variant in TOMM40 associated with human longevity, mitochondrial protein import integrity, and delay in cognitive decline.
This SNP is frequently analyzed in the context of Alzheimer's disease risk and cognitive decline.