SLC39A8 provides instructions for a transporter that moves minerals, especially manganese, into cells so many enzymes work normally. This gene helps your body support brain development, immune function, and protein “sugar-coating” (glycosylation). When SLC39A8 does not work well, some people develop a rare inherited condition with low manganese, developmental delay, low muscle tone, seizures, and growth differences; treatment may include monitored manganese. More common SLC39A8 variants are linked to small shifts in risk for conditions like inflammatory bowel disease or schizophrenia, but they do not diagnose these conditions.
What is a gene?
A gene is a stretch of DNA that holds instructions cells use to make molecules or guide how the body’s systems work. In some cases, a gene provides the recipe for a protein, which acts as one of the cell’s main working components. In other cases, genes primarily help manage when, where, and how much certain body activities are turned on. Taken together, genes affect how the body grows and operates, and they can influence how you react to food, stress, or medicines. For a deeper look at this subject, you can learn more in the LearnHub.
Overview
SLC39A8Gene function
What if the gene works
The SLC39A8 gene helps move manganese into cells. This supports enzymes that help nerves, immunity, and normal protein sugar patterns work properly. It can also transport some zinc and iron.
Risk
What if the gene does not work
When the SLC39A8 gene doesn’t work well, cells may not get enough manganese, which can affect brain development. Depending on the DNA change, symptoms can range from mild learning or coordination problems to seizures, low muscle tone, and poor growth.
Treatment
What does that mean for your treatment
Pathogenic SLC39A8 gene variants can be treated with manganese supplementation supervised by a clinician, which may improve symptoms in some people. Galactose supplements are used in selected cases to support glycosylation. Monitoring helps avoid manganese overload.
Conditions associated with SLC39A8
Gene function
What if the gene works
Your body relies on small amounts of minerals like manganese and zinc to keep many enzymes working from day to day. The SLC39A8 gene helps bring these minerals into cells so they can be used where needed. This supports steady cell activity in many tissues, including the liver, gut, and immune system.
This gene makes a cell-surface transporter that brings manganese into cells. As an SLC39A8 manganese transporter, it helps keep enough manganese available for many routine enzyme tasks throughout the body.
The SLC39A8 gene can also transport other metals, including zinc and iron, into cells. This helps your body balance these minerals so cells have what they need for normal metabolism and maintenance.
Manganese delivered by SLC39A8 supports enzymes that add and shape sugar chains on proteins (glycosylation, a common “finishing step”). These sugar chains help proteins fold well, travel to the right place, and interact normally with other cells.
What is a variant?
A genetic variant means there is a minor difference in the DNA sequence within a gene. These DNA changes are widespread and help explain normal differences between people, such as traits related to appearance, metabolism, or the way the body reacts to environmental factors. Many variants do not cause any obvious changes and are part of ordinary genetic diversity. Sometimes, though, a variant affects how a gene works to a greater degree and may play a role in, or directly lead to, a genetic condition.
Genetic variants
What if the gene does not work
Changes in the SLC39A8 gene can weaken the cell’s ability to bring in manganese, a mineral needed for many body processes. Some SLC39A8 gene mutation types only partly reduce this transport and may lead to milder learning or movement differences, while others greatly disrupt it and can cause earlier-onset developmental delay, seizures, or muscle tone changes. The exact features vary by the variant and by other health and environmental factors.
How variants are linked to conditions
Changes in the SLC39A8 gene have been tied to two main kinds of health findings. Rare, inherited pathogenic variants in both copies can cause SLC39A8-congenital disorder of glycosylation, a diagnosis marked by developmental delay, low muscle tone, seizures, and movement or coordination problems. In population studies, a common SLC39A8 gene variant linked to schizophrenia has also been associated with small shifts in traits like blood pressure and body weight, meaning it may influence risk without determining who gets a condition.
A variant is not necessarily a diagnosis
Differences in DNA are expected in humans and occur frequently across the population. In most situations, these genetic variants do not directly change health and instead represent normal human variation. For many genes, finding a variant that has been linked to a condition points to a potential connection rather than a confirmed diagnosis, particularly when risk depends on several genes along with environmental influences. In certain situations, though, one clearly established variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For most people, common changes in the SLC39A8 gene slightly shift risk for complex conditions, so family history, many other genes, and everyday factors like diet, activity, sleep, smoking, and alcohol use can still matter a lot. Rare harmful changes in both copies of SLC39A8 can cause a serious inherited condition where risk is mostly genetic. There is not enough evidence to say specific lifestyle changes prevent that condition, but regular medical follow-up can help catch problems early.
Inheritance of SLC39A8 variants
Most well-established disease-causing changes follow an autosomal recessive pattern in the inheritance of the SLC39A8 gene variants. This means a child is typically affected only when they inherit one nonworking copy from each parent, while parents who carry one changed copy usually do not have symptoms. When both parents are carriers, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of a child who inherits neither changed copy.
What does my SLC39A8 result mean for my family?
If a result in the SLC39A8 gene was found, share it with close blood relatives because it can help them understand possible health risks and next steps. Seek medical advice if you or family members have ongoing developmental or learning concerns, unusual movement symptoms, or repeated unexplained illnesses, since some SLC39A8-related conditions can be treatable when recognized early. Also ask for guidance before starting new medicines or supplements, because results may change care choices.
Genetic information
Genetic testing
How you find out about variants
To learn whether you carry a change in the SLC39A8 gene, genetic testing analyzes DNA from a blood draw or saliva sample. A clinical SLC39A8 genetic test usually uses sequencing to read the gene’s code and report variants as pathogenic, benign, or uncertain. Results are read alongside your health history, and consumer tests may need lab confirmation.
When should I consider getting a genetic test?
Consider genetic testing for the SLC39A8 gene when a baby or child has unexplained developmental delays, low muscle tone, seizures, or unusual movement problems, especially alongside very low manganese levels on blood tests. It can also be helpful when similar symptoms run in the family or a relative already has a known SLC39A8 change. Results may guide monitoring and treatment planning.
A genetic result is only one part of your health story
Genetic test results can be very informative, but their usefulness varies depending on the health condition and the specific kind of variant found. How your body functions over the years is also shaped by factors like your lifestyle, environment, age, and medical history. With some conditions, particularly those affected by many genes, genetic findings provide helpful context rather than a definite prediction and make the most sense when considered alongside other parts of care. In other situations, a genetic result can be more straightforward and give a clear answer. When it comes to how someone responds to medications, genetic information can also help frame individual experiences in a broader context.
Pharmacogenetics
How variants shape your response to medicine
Genetic differences can affect how people respond to medicines, and for the SLC39A8 gene there is not a widely used, well-established role in guiding routine medication choices. Even with the same prescription, your body may absorb a drug differently, break it down at a different speed, or be more sensitive to its effects. These differences are common and can influence how well a treatment works or how likely side effects are. In some cases, gene changes that affect how cells handle minerals and nutrients can also shape overall health in ways that indirectly influence medication response.
What is Pharmacogenetics?
Pharmacogenetics focuses on how variations in your genes can affect the way you respond to medicines. It examines connections between specific genes and particular drugs to clarify why the same treatment can have different effects in different people. For a wide range of medications, genetics can influence how powerfully a drug works or how your body handles it. This information can support more informed, more personalized choices about treatment. More details on this topic are available in the LearnHub.
Drugs influenced by the SLC39A8 gene
When should I seek medical advice?
Seek medical advice if you or your child has ongoing developmental delays, seizures, unusual movement problems, or unexplained learning and behavior changes, especially when symptoms start early in life. People with known changes in the SLC39A8 gene should check in if symptoms worsen or new problems appear. Get medical guidance before starting mineral supplements, including manganese, since too much can be harmful.
History
The SLC39A8 gene first drew scientific interest when it was identified as part of a family of human metal transporter genes in the early 2000s. In recent decades, awareness of this gene’s role has grown as genetic studies linked common SLC39A8 variants to measurable traits such as blood pressure, inflammation markers, and differences in body weight across large populations. Attention increased further when genome wide studies reported associations between SLC39A8 changes and neurodevelopmental and psychiatric conditions, including schizophrenia risk, emphasizing that these findings reflect tendencies rather than diagnoses. Later, clinicians recognized that some people with two disease causing SLC39A8 variants can have a rare inherited condition involving developmental delays and characteristic lab findings. As genetic testing became more widely used, additional families helped clarify the range of health effects tied to this gene.