The SLC23A1 gene helps your intestines and kidneys absorb and hold on to vitamin C, which supports skin, blood vessels, wound healing, and other everyday body functions. If this gene does not work properly, vitamin C levels can drop, and some people may be more prone to deficiency symptoms such as easy bruising, bleeding gums, tiredness, or slow healing. Differences in this gene can help explain why people maintain different vitamin C levels even with a similar diet.
What is a gene?
Genes are stretches of DNA that give your cells instructions to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, the parts of cells that do much of the work. Other genes mainly control 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 also influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
SLC23A1Gene function
What if the gene works
The SLC23A1 gene helps your body absorb vitamin C from food and hold on to it in the kidneys. This supports normal vitamin C levels for skin, blood vessels, and other tissues.
Risk
What if the gene does not work
Changes in the SLC23A1 gene can range from milder to more severe variants and may reduce how well cells move vitamin C across the intestine and kidney. This can lower transporter activity or impair vitamin C reabsorption and uptake.
Treatment
What does that mean for your treatment
For a pathogenic variant in the SLC23A1 gene, no gene-specific treatment or drug choice approach is currently established in clinical guidelines. The SLC23A1 gene is being studied for its role in vitamin C absorption and blood levels, including whether it may influence response to vitamin C supplementation, but this is not used to guide routine care.
Gene function
What if the gene works
Your body uses the SLC23A1 gene to manage vitamin C in a steady, efficient way. It helps bring vitamin C in from food and keeps useful amounts from being lost in urine. When this system works normally, many tissues have a dependable supply for everyday upkeep.
The SLC23A1 gene provides instructions for a transporter protein that moves vitamin C into certain cells. This controlled transport lets the body collect and hold on to this essential nutrient.
In the small intestine, this transporter helps cells take in vitamin C from food. This is a key part of how the SLC23A1 gene helps your body absorb vitamin C and pass it into the bloodstream.
In the kidneys, the same transport system helps reclaim vitamin C after it is filtered from the blood. This reduces vitamin C loss in urine and helps preserve a steady supply.
By supporting absorption and recovery, the SLC23A1 gene helps keep vitamin C levels more stable across the body. That steady supply supports normal collagen production and protection from everyday cell stress.
What is a variant?
A genetic variant is a small alteration in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or how 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 change a gene’s function more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SLC23A1 gene can change the shape, stability, or cell surface placement of its vitamin C transporter, which may lower transport activity. Studies of how SLC23A1 gene variants affect vitamin C transport show a spectrum from milder changes that slightly reduce transporter efficiency to more severe loss-of-function variants that markedly impair vitamin C uptake and kidney reabsorption at the cellular level. Some variants may also disrupt sodium coupling, which further weakens vitamin C movement across cell membranes.
How variants are linked to conditions
SLC23A1 gene variants do not yet have a broadly confirmed link to a specific health condition, and current evidence on SLC23A1 gene variants linked to disease is still developing. Some studies suggest possible health effects in certain people, but these findings are not strong enough to support a single established SLC23A1 related diagnosis. Anyone with a confirmed variant in the SLC23A1 gene should follow guidance from their doctor or genetic counselor.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common throughout the general population. Most have no direct impact on health and simply reflect natural human variation. For many genes, carrying a variant connected with a condition suggests a possible association rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some situations, though, one well-characterized variant in a particular gene can be 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 SLC23A1 gene itself. Some studies suggest that diet, smoking, and other causes of low vitamin C may matter more for overall vitamin C levels, but the effect of SLC23A1 changes can vary.
Inheritance of SLC23A1 variants
There is not yet a broadly confirmed Mendelian inheritance pattern for health conditions linked to the SLC23A1 gene, so how variants of the SLC23A1 gene are inherited in a disease specific way is still being clarified. The SLC23A1 gene is on chromosome 5, which is an autosome. That means you inherit one copy from your mother and one copy from your father.
What does my SLC23A1 result mean for my family?
There is not yet a broadly confirmed family inheritance pattern for SLC23A1 tied to one clearly defined genetic condition. If you have a specific SLC23A1 result, what it could mean for relatives depends on the exact change and the health issue being looked at.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the SLC23A1 gene, genetic testing usually analyzes DNA from a blood sample or cheek swab, often as part of a multigene panel or broader sequencing test. A lab reads the gene’s code and compares it with a reference sequence to identify differences and classify whether they are linked to health.
When should I consider getting a genetic test?
There isn't yet a broadly established SLC23A1-specific reason for genetic testing in routine care. Testing decisions are usually based on your personal health and family history and are best discussed with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal varies by the condition and the kind of variant involved. How the body functions over time is also shaped by many other factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most helpful when viewed alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can also help put individual experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body absorbs, breaks down, transports, or responds to a drug, so the same treatment may work better for one person than for another. These differences are common and can influence both benefit and side effects, including how sensitive someone is to a usual dose.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect responses to medications. It studies patterns between genes and drugs to help explain why treatments can work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This information can support more informed and more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the SLC23A1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so general questions about medicines, side effects, or vitamin C supplements are best discussed with your doctor. SLC23A1 has been studied for how the body absorbs and handles vitamin C, but this research is not used in routine prescribing.