The TSPO gene helps cells move cholesterol into mitochondria, the parts of cells that make energy, which supports the production of steroid hormones such as cortisol and sex hormones. If it does not work normally, cells may make these hormones less efficiently and respond to stress signals differently. In medicine, this gene is important because levels of the TSPO protein often rise in inflamed or injured tissue and can be tracked in some brain imaging studies. TSPO is better known in research than in everyday public culture.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or manage processes in the body. Some genes hold the information needed to produce proteins, the parts of cells that do the work. Other genes mostly help regulate when certain processes happen, where they take place, and how strongly they occur. Together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. To explore this topic in more detail, you can find more in the LearnHub.
Overview
TSPOGene function
What if the gene works
The TSPO gene helps cells move cholesterol into mitochondria, the parts of cells that make energy. This supports steroid hormone production and may help cells respond to stress and inflammation.
Risk
What if the gene does not work
Changes in the TSPO gene can reduce how well cells move cholesterol into mitochondria, which may alter steroid hormone production and the cell's stress response. Milder variants may partly reduce this activity, while more severe variants can disrupt it further.
Treatment
What does that mean for your treatment
No TSPO-specific treatment, management approach, or routine drug choice is currently established for pathogenic variants in the TSPO gene. TSPO is better known in research as a marker used in brain scans to study inflammation, and it is also being explored as a possible drug target.
Gene function
What if the gene works
Most of the TSPO protein sits on mitochondria, the parts of cells that make energy. The TSPO gene supports how cells manage cholesterol, energy use, and everyday stress signals. Understanding what the TSPO gene does in the body helps explain why it is active in many tissues.
The TSPO gene helps mitochondria carry out steady energy related work. Its protein sits in the outer mitochondrial membrane and supports communication between mitochondria and the rest of the cell.
TSPO protein can bind cholesterol and help guide it into mitochondria. This supports normal cell chemistry, including steroid hormone production in tissues that naturally make these hormones.
Your cells use the TSPO gene to adjust mitochondrial activity during everyday stress. This helps keep energy use, calcium signaling, and other routine cell signals more controlled as conditions change.
What is a variant?
A gene variant is a slight change in the DNA sequence within a gene. These changes are common and help account for normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can more significantly affect how a gene functions and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
TSPO gene variants can change the protein’s shape in the outer membrane of mitochondria, which may alter how well it binds cholesterol and certain imaging tracers. This is how TSPO gene variants affect protein function at the cell level. Milder variants may mainly shift binding strength, while more severe variants can reduce protein stability, lower the amount of protein made, or weaken its activity.
How variants are linked to conditions
Variants in the TSPO gene do not yet have a broadly confirmed link to one specific inherited health condition, although research on TSPO gene variants and disease risk is still evolving. Some studies have reported possible associations, but the findings are not strong enough to define a clear TSPO related diagnosis. If you carry a TSPO variant, your doctor or genetic counselor can interpret it alongside your symptoms, medical history, and family history.
A variant is not necessarily a diagnosis
Genetic variants are common and are a usual part of human biology. Most do not have a direct effect on health and instead reflect natural differences among people. For many genes, having a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, one well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce health risk related to the TSPO gene. If you have a TSPO result and want to understand what it may mean for you or your family, a doctor or genetic counselor can help put it in context.
Inheritance of TSPO variants
There is not yet a broadly confirmed inheritance pattern tied to a specific TSPO-related condition, so answers about how TSPO gene variants are inherited remain cautious and research based. In practice, TSPO gene inheritance follows the usual pattern for genes on the numbered chromosomes: you receive one copy from each parent. The TSPO gene is located on chromosome 22, which is an autosome, so inheritance is not based on being male or female.
What does my TSPO result mean for my family?
There is not yet a broadly confirmed inherited condition for the TSPO gene that lets doctors clearly predict what a TSPO result means for relatives. If you have a specific TSPO finding, the family impact depends on the exact change and why the test was done, and a genetics specialist can explain it in the context of your family history.
Genetic information
Genetic testing
How you find out about variants
TSPO genetic testing uses a saliva or blood sample to read the TSPO gene and look for variants. To find out about TSPO gene variants, a lab compares your DNA with a reference sequence and reports whether a variant is present, absent, or of uncertain significance.
When should I consider getting a genetic test?
There is not yet a broadly established reason for most people to have TSPO genetic testing as part of routine care. In some specialized settings, a doctor may check a common TSPO change before a TSPO PET brain scan because it can affect how the scan works and how results are read.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it explains depends on the condition and the type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment at the same dose, yet one may get better benefit while the other may notice less effect or be more sensitive to side effects. This often happens because inherited differences can change how the body breaks down, moves, or responds to a drug, and these differences are common.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape a person’s response to medications. It focuses on relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can affect both how strongly a drug works and how the body handles it. This information can support more informed and individualized treatment decisions. To explore this subject further, you can learn more in the LearnHub.
Drugs influenced by the TSPO gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding routine medication choices, so general questions about side effects, treatment response, or medicine safety are best discussed with your doctor. TSPO has mainly been studied in brain imaging and early research on inflammation-related treatments, but this has not led to standard prescribing changes in everyday care.
History
Researchers first recognized the TSPO gene through studies in the 1970s that found benzodiazepine binding sites outside the brain. It was long known as the “peripheral benzodiazepine receptor,” a name based on how it was first detected rather than its broader biology. Scientific classifications changed as researchers learned more about the gene. As the field advanced, the older name was gradually replaced by “translocator protein,” reflecting a shift toward a more accurate description. TSPO later became especially important in imaging research, where it was used as a marker in brain and body studies. Over time, scientists’ understanding of the TSPO gene has changed, and its history mirrors how genetics often moves from an early label to a clearer picture.