The SLC34A3 gene helps the kidneys hold on to phosphate, a mineral your body needs for strong bones and teeth. If this gene is not working properly, too much phosphate can leave in the urine, which may lead to soft or painful bones, slow growth in childhood, muscle weakness, or fractures. Many people with harmful variants in the SLC34A3 gene also pass extra calcium in the urine, which can raise the chance of kidney stones. Some carriers have milder effects, while others have clearer symptoms.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes hold the directions for making proteins, which are the working parts of cells. Others mainly help determine when certain processes happen, where they happen, and how strongly they operate. Taken together, genes affect how the body develops and functions, and they can shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
SLC34A3Gene function
What if the gene works
The SLC34A3 gene helps the kidneys reclaim phosphate from urine. This supports healthy blood phosphate levels, vitamin D balance, and normal bone and tooth mineralization.
Risk
What if the gene does not work
Variants in the SLC34A3 gene can impair phosphate reabsorption in the kidneys, leading to hereditary low-phosphate rickets with high urine calcium. Features may include bone pain, growth changes, and kidney stones, with mild or severe variants changing timing and severity.
Treatment
What does that mean for your treatment
With a pathogenic or loss-of-function variant in the SLC34A3 gene, treatment usually centers on oral phosphate replacement. Active vitamin D, such as calcitriol, is usually avoided unless there is another clear reason to use it, because it can raise urine calcium and increase kidney stone risk. Monitoring helps tailor phosphate dosing and follow urine calcium.
Conditions associated with SLC34A3
Gene function
What if the gene works
Your kidneys use the SLC34A3 gene to reclaim phosphate, a mineral your body needs every day. This is part of how the kidneys handle phosphate after blood is filtered. Steady phosphate levels support bones, teeth, and normal cell energy.
In the first part of the kidney tubule, the SLC34A3 gene helps cells take phosphate back from the forming urine. It moves phosphate together with sodium, which helps this reabsorption work efficiently.
By returning phosphate to the blood, this gene helps keep phosphate levels in a healthy range. That steady supply supports muscles, nerves, and the way cells store and use energy.
Phosphate is a basic building block for bones and teeth. By helping the body conserve phosphate, the SLC34A3 gene supports normal growth, bone renewal, and everyday maintenance.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Some SLC34A3 gene variants make the phosphate transporter shorter, unstable, or less able to move phosphate in kidney cells. Milder changes may leave some activity, while more severe variants can largely shut the transporter down. When both gene copies carry function-reducing variants, phosphate loss is often greater and symptoms of hereditary hypophosphatemic rickets with hypercalciuria may appear earlier or be more pronounced.
How variants are linked to conditions
Pathogenic variants in the SLC34A3 gene cause hereditary hypophosphatemic rickets with hypercalciuria, a condition linked to soft or painful bones, short stature, kidney stones, and calcium buildup in the kidneys. Some people carrying one SLC34A3 gene change have a milder picture, often with recurrent kidney stones or low phosphate levels. Overall, SLC34A3 gene variants linked to conditions most strongly point to this form of rickets and related kidney problems.
A variant is not necessarily a diagnosis
Variants in genes are a normal part of being human and are common throughout the general population. Most have no direct impact on health and simply reflect natural human diversity. For many genes, carrying a variant tied to a condition suggests a possible association, not a definite diagnosis, especially when more than one gene and environmental factors contribute. There are cases, though, where one single, well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For SLC34A3, the chance of developing the related condition is driven mainly by the gene change itself, especially when both copies of the gene are affected. Symptom severity can vary, and dehydration may raise the chance of kidney stones, but there is not enough evidence to say lifestyle changes lower the underlying genetic risk.
Inheritance of SLC34A3 variants
SLC34A3 gene inheritance for the best known SLC34A3-related condition follows an autosomal recessive pattern. This means a child usually inherits one altered copy of the SLC34A3 gene from each parent. When both parents carry one variant, each pregnancy has a 25% chance of producing a child with the condition, a 50% chance of producing a child who is a carrier, and a 25% chance of producing a child without either familial variant. Because the SLC34A3 gene is on chromosome 9, this pattern is the same for males and females.
What does my SLC34A3 result mean for my family?
For SLC34A3, family impact is usually discussed in a recessive pattern. Full brothers and sisters of someone with two disease-causing SLC34A3 changes may also be affected or may be carriers, and parents are usually carriers. Other relatives can sometimes carry the same gene change even if they have no clear symptoms, so the meaning for family members often extends beyond one person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the SLC34A3 gene, a lab can do SLC34A3 genetic testing using blood, saliva, or a cheek swab. The test reads the DNA sequence and looks for changes in this gene. Results may show a benign variant, a pathogenic variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
SLC34A3 testing can be worth discussing if someone has repeated kidney stones, calcium buildup in the kidneys, low blood phosphate, or bone softening or rickets, especially starting in childhood or running in the family. Testing may help confirm whether changes in the SLC34A3 gene are the cause.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains varies with the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, particularly those shaped 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. Two people can take the same treatment and have different results because their bodies may absorb, break down, transport, or respond to a drug in different ways. These inherited differences are common and can influence how well a medicine works or how sensitive someone is to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect responses to medications. It studies links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body handles it. This information can support treatment decisions that are both better informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the SLC34A3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose. If you have concerns about side effects, starting a new medicine, or how treatment fits with your overall health, it is best to talk that through with your doctor.
History
Families and communities once noticed patterns that seemed to pass from parent to child. In the late 20th century, doctors described families with a form of rickets and kidney calcium loss that did not fit better known inherited bone conditions. From these first observations, research expanded steadily. In 2006, researchers linked this condition to variants in the SLC34A3 gene, helping confirm that it was a distinct inherited cause of low phosphate. That discovery sharpened diagnosis and separated it from other phosphate related conditions that are driven by different genes and hormones. Over time, descriptions became more precise, and the SLC34A3 gene became an established part of the medical story of hereditary hypophosphatemic rickets with hypercalciuria.