The SLC39A5 gene helps control how cells handle zinc, a mineral your body needs for normal growth and signaling, including in the eye. This gene helps your body keep zinc moving where cells need it. If it does not work properly, eye growth can become less controlled, and some people develop high myopia, which means strong nearsightedness. People with certain variants may need strong glasses early in life and may have a higher chance of eye problems linked to eyes that grow longer than usual.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate processes throughout the body. Many genes provide the code for proteins, the parts of cells that do the work. Others mainly direct when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, and medications. For a deeper look at this topic, more information is available in LearnHub.
Overview
SLC39A5Gene function
What if the gene works
The SLC39A5 gene helps move zinc into certain cells and supports the body’s zinc balance. Zinc is needed for normal cell growth, tissue maintenance, and many enzyme functions.
Risk
What if the gene does not work
Variants in the SLC39A5 gene are linked to early-onset high myopia, often with marked nearsightedness from childhood. Milder to more severe variants can influence how early it appears and how pronounced the eye changes become.
Treatment
What does that mean for your treatment
For pathogenic or loss-of-function variants in the SLC39A5 gene, no gene-specific treatment or drug-selection approach is currently established in clinical guidelines.
Conditions associated with SLC39A5
Gene function
What if the gene works
Your body needs a steady supply of zinc for everyday cell work. The SLC39A5 gene helps manage how zinc moves into certain cells, especially in tissues that help regulate zinc balance. Understanding how the SLC39A5 gene helps control zinc levels in the body makes its role easier to picture.
The SLC39A5 gene helps move zinc from the blood or surrounding fluid into cells. This gives cells access to a mineral they need for many routine tasks.
By adjusting zinc entry into specific tissues, this gene supports healthy zinc levels across the body. When it works properly, zinc is available where it is needed without large swings.
Zinc helps many proteins do their jobs, so this gene indirectly supports growth, tissue upkeep, and cell signaling. In day to day life, that means cells can carry out normal maintenance more smoothly.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help explain normal human diversity, including variation in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions to a greater extent and may contribute to, or cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SLC39A5 gene can alter the transporter’s shape, reduce its stability, or keep too little of it from reaching the cell surface. These changes show how SLC39A5 gene variants affect zinc transport in cells. Some variants only partly reduce activity, while more severe variants can leave little or no working transporter. In SLC39A5-related high myopia, stronger loss of function may be linked to earlier or more marked eye changes, although this can vary.
How variants are linked to conditions
Certain rare variants in the SLC39A5 gene can cause inherited high myopia, a form of severe nearsightedness that often begins in childhood and runs in families. Inherited high myopia caused by SLC39A5 gene variants may also come with retinal changes seen in pathologic myopia, and some people have a higher chance of retinal detachment. This applies to rare variants known to cause disease rather than to most common genetic differences.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors play a role. In some situations, however, a single well-characterized variant in a specific 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 increase or reduce health risk related to the SLC39A5 gene itself. In families with an SLC39A5 change linked to severe nearsightedness, risk is mainly shaped by the inherited gene change rather than day-to-day habits. Anyone concerned about personal or family risk should speak with a doctor or genetic counselor.
Inheritance of SLC39A5 variants
For families asking about the SLC39A5 inheritance pattern, disease-causing variants in the SLC39A5 gene are most often inherited in an autosomal dominant way for SLC39A5-related high myopia. This means a parent carrying the variant can pass it to a child, and each pregnancy has a 50% chance of inheriting that same variant. Sons and daughters are affected at similar rates, and the variant can be passed from either mother or father.
What does my SLC39A5 result mean for my family?
Changes in the SLC39A5 gene have been linked to an inherited form of high myopia, or severe nearsightedness, that can run in families in a dominant pattern. This means close relatives, such as a parent, sibling, or child, may also carry the same gene change and may have strong nearsightedness or related eye findings. Some cases can happen for the first time in one person, so a parent is not always the source.
Genetic information
Genetic testing
How you find out about variants
Variants in the SLC39A5 gene are found through genetic testing, usually using a blood or saliva sample. SLC39A5 genetic testing reads the DNA code and compares it with the usual sequence to look for changes. Results may identify a known harmful variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Genetic testing may be worth considering if severe nearsightedness starts in childhood and runs strongly in your family, since rare changes in the SLC39A5 gene have been linked to inherited high myopia. Testing is usually most helpful when an eye specialist suspects a genetic cause because of very early vision changes or several affected relatives.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it explains varies based on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can help put individual experiences into 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. This is common and helps explain why the same treatment works well for one person but less well for another, or why some people are more sensitive to side effects. In practice, genetics is one of several factors that can shape medication response, along with age, kidney and liver function, other medicines, and overall health.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect the way someone responds to medication. By looking at connections between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This understanding can support more informed, individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the SLC39A5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines, so general concerns about side effects, new symptoms, or medication changes are best discussed with your doctor.