The VIPAS39 gene helps cells move important proteins to the right place, especially in the liver, kidneys, and skin. If this gene does not work properly, cells can lose some of their normal organization and transport, which can affect how these organs work. Pathogenic variants in both copies of the VIPAS39 gene can cause a rare inherited condition called ARC syndrome, with features that may include stiff joints at birth, poor bile flow from the liver, kidney problems, and dry, scaly skin.
What is a gene?
Genes are stretches of DNA that give your cells instructions to make molecules or regulate processes in the body. Some genes carry the information needed to produce proteins, the parts of cells that do the work. Others mainly direct when, where, and how strongly certain processes take place. As a group, genes influence how the body develops and functions, and they can shape how you respond to food, stress, and medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
VIPAS39Gene function
What if the gene works
The VIPAS39 gene helps cells sort and deliver proteins to the right places, especially in the liver and skin. This supports normal cell organization and the function of some storage and recycling compartments.
Risk
What if the gene does not work
More disruptive variants in the VIPAS39 gene can cause ARC syndrome, with stiff joints at birth, liver cholestasis, and kidney problems. Milder variants may lead to later onset or a less severe mix of these features.
Treatment
What does that mean for your treatment
No VIPAS39-specific treatment or drug selection approach is currently established. Care is guided by the person’s symptoms and complications rather than by a medication choice linked specifically to the VIPAS39 gene.
Conditions associated with VIPAS39
Gene function
What if the gene works
The VIPAS39 gene helps cells move proteins and other cargo to the right place. Its protein is part of the cell’s internal delivery system, which keeps membranes and recycling compartments organized. This steady traffic supports normal day to day cell function.
Inside your cells, the VIPAS39 gene helps sort proteins into small transport sacs called vesicles. This gives each cargo a clear route to the membrane or internal compartment where it is needed.
Its protein works with VPS33B, a trafficking partner, to help delivery sacs connect with endosomes and lysosomes (the cell’s sorting stations and recycling centers). This supports orderly protein sorting inside cells.
By guiding where cargo is delivered, this gene helps cells keep the right proteins on the right surface. That supports normal cell organization, especially in cells with clearly defined top and bottom sides.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or the way 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 more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
For VIPAS39 gene variants and how they affect protein function, the main pattern is loss of function. Some variants shorten the protein so much that cells make little or none of it, while others change single building blocks and weaken its stability or its interaction with VPS33B, which can disrupt protein sorting inside the cell. Milder variants may leave some activity, while more severe variants often reduce activity further and can be linked to earlier or broader features of ARC syndrome.
How variants are linked to conditions
Pathogenic variants in the VIPAS39 gene cause arthrogryposis, renal dysfunction, and cholestasis syndrome type 2, so the main VIPAS39 gene variants and health conditions link is this rare inherited condition. People with it can be born with stiff joints and may develop liver cholestasis, kidney problems, poor growth, and skin changes. This is a confirmed genetic diagnosis when disease-causing variants are found in both copies of the gene.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and instead reflect natural differences between people. For many genes, a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences also play a role. In other situations, though, one well understood variant in a particular gene is enough to establish the 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 VIPAS39 gene itself. For families with a known VIPAS39 change, risk is mainly shaped by whether a child inherits gene changes from both parents, and a doctor or genetic counselor can explain what that means for relatives.
Inheritance of VIPAS39 variants
VIPAS39-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one altered copy of the VIPAS39 gene from each parent, and the parents are often healthy carriers. When both parents carry a variant in the VIPAS39 gene, each pregnancy has a 25% chance of being affected, a 50% chance that the child will be a carrier, and a 25% chance of inheriting neither variant. In families looking into how VIPAS39 gene variants are inherited, this pattern means boys and girls are affected equally.
What does my VIPAS39 result mean for my family?
For families with a disease-causing change in the VIPAS39 gene, the condition is passed down in a recessive pattern. This usually means parents can be healthy carriers, and brothers or sisters may also be affected or be carriers. Other close relatives may also carry the gene change, so the result can matter beyond just one person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the VIPAS39 gene, a lab can analyze DNA from blood, saliva, or a cheek swab. VIPAS39 genetic testing looks for changes in the gene and may be done alone or as part of a broader panel. Results can show whether a variant is present and may help confirm a diagnosis.
When should I consider getting a genetic test?
Genetic testing for the VIPAS39 gene may be considered when a baby or child has a rare pattern of symptoms such as stiff or fixed joints at birth, ongoing liver problems with poor bile flow, and kidney problems. It can also help when this condition runs in the family or when parents are known carriers.
A genetic result is only one part of your health story
Genetic test results can offer useful insight, but how much they reveal depends on the condition and the specific type of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body works. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is best understood 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 into perspective.
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 breaks down a drug, moves it through the body, or responds to it at its target. Because of this, the same medication may work better for some people, have less effect in others, or cause more side effects in some than in others.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect their response to medicines. It studies links between genes and medications to help explain why the same treatment may work differently in different people. For many drugs, genetic factors influence how strongly a medicine works or how the body handles it. This information can support more informed, personalized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the VIPAS39 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or predicting medicine response, so general questions about treatments, side effects, or health changes are best discussed with your doctor.
History
Throughout history, people have described features that hinted at this gene. Children with the pattern now linked to the VIPAS39 gene were first recognized through the condition called arthrogryposis, renal dysfunction, and cholestasis, or ARC syndrome. For years, doctors identified the condition by its visible signs and organ problems rather than by its genetic cause. Building on this early work, scientists uncovered more about the gene in the 2000s, when variants in the VIPAS39 gene were found in some people with ARC syndrome. This helped show that ARC syndrome can result from changes in more than one gene. That discovery sharpened diagnosis and improved the way researchers classify this rare inherited condition.