The SARS2 gene helps mitochondria, the parts of your cells that make energy, produce the proteins they need to work well. If it does not work properly, cells may struggle to make enough energy, which can lead to a rare inherited mitochondrial condition. Pathogenic variants in the SARS2 gene are best known for causing HUPRA syndrome, which often affects the kidneys, growth, and the blood vessels in the lungs. Some people may also have developmental or neurologic effects.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for producing proteins, the working parts of cells. Other genes mostly help determine when certain processes happen, where they take place, and how strongly they occur. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in the LearnHub.
Overview
SARS2Gene function
What if the gene works
The SARS2 gene helps mitochondria, your cells’ energy producers, make proteins by placing serine in the right spot during protein building. This supports steady energy production, especially in organs with high energy needs.
Risk
What if the gene does not work
When the SARS2 gene does not work properly, it can cause HUPRA syndrome, a rare mitochondrial condition. People may develop kidney problems, high uric acid levels, and pulmonary hypertension, and milder or more severe variants can change onset and severity.
Treatment
What does that mean for your treatment
No SARS2-specific treatment or drug-selection approach is currently established. Care is guided by the person’s symptoms and the organs affected, rather than by a pathogenic variant in the SARS2 gene itself.
Conditions associated with SARS2
Gene function
What if the gene works
Your cells need the SARS2 gene for a basic step in making proteins inside mitochondria, the parts of cells that help supply energy. It helps attach the amino acid serine to the right transfer RNA, a small carrier used during protein building. This is part of how the SARS2 gene helps your cells make energy day to day.
Inside mitochondria, the SARS2 gene helps place the amino acid serine onto the correct transfer RNA. This prepares an essential building block so mitochondrial proteins can be assembled in the right order.
Its protein supports the protein making process inside mitochondria, where these structures read their own genetic instructions. This helps cells build several proteins needed for normal energy production.
By keeping mitochondrial protein production running smoothly, the SARS2 gene supports how cells release usable energy from food. This helps maintain steady everyday cell function throughout the body.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant can affect how a gene functions more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SARS2 gene can change the shape or stability of its protein inside mitochondria, the parts of cells that make energy, so the protein works less well or is missing. Milder variants may leave some activity, while more severe variants can reduce its ability to load serine onto a helper RNA in mitochondria, a key step in making proteins. This shows how SARS2 variants affect protein function and helps explain why children may develop more severe features.
How variants are linked to conditions
Pathogenic variants in the SARS2 gene cause HUPRA syndrome, so the main answer to how SARS2 variants are linked to conditions centers on this rare inherited condition. HUPRA syndrome is associated with high uric acid levels, pulmonary hypertension, kidney failure starting in infancy, and a blood chemistry change called alkalosis. This link is well established in medical genetics and is used to help confirm the diagnosis in affected families.
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 directly affect health and instead reflect normal human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a certain diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, one well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For SARS2, risk is mainly determined by genetics: people are affected when they inherit harmful changes in both copies of the gene. Family history and whether both parents carry a SARS2 change matter most for the chance of having an affected child. There is not enough evidence to say lifestyle changes lower this risk.
Inheritance of SARS2 variants
Variants in the SARS2 gene are inherited in an autosomal recessive pattern. This means a child usually inherits one changed copy from each parent, and both parents are typically healthy carriers. When both parents carry a SARS2 gene variant, each pregnancy has a 25% chance of resulting in a child with the condition, a 50% chance of carrier status, and a 25% chance of inheriting neither variant. In practical terms, SARS2 gene inheritance usually affects siblings within a family rather than passing directly from an affected parent to every child.
What does my SARS2 result mean for my family?
For families, a disease-causing change in the SARS2 gene usually matters most for siblings and future children because this gene is linked to a recessive inherited condition. Parents are often healthy carriers, and brothers or sisters may also be carriers or, less often, have the condition if they inherited the same changed copy from both parents. Other blood relatives may also carry the variant, especially on the same side of the family.
Genetic information
Genetic testing
How you find out about variants
Variants in the SARS2 gene are found with genetic testing, usually by analyzing DNA from a blood sample, saliva, or a cheek swab. A lab reads the gene’s code and compares it with the usual sequence to look for changes. Genetic testing for variants in the SARS2 gene can help confirm whether a person carries a disease-causing variant.
When should I consider getting a genetic test?
Genetic testing for the SARS2 gene may be considered when a baby or child has a rare pattern of severe kidney problems, high uric acid levels, and high blood pressure in the lungs, especially if similar illness runs in the family. It can help confirm the cause when this inherited condition is suspected.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also influence how the body functions. For some conditions, particularly those shaped by many genes, genetic information offers context rather than certainty and makes the most sense when considered with the rest of a person’s 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 context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same medication works well for one person, seems less effective for another, or causes more side effects in someone else. These differences are common and are one part of the reason treatment response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way medications work. It studies gene-drug relationships to better understand why the same treatment may act differently from one person to another. For many medicines, genes help shape how strongly a drug works or how the body handles it. This information can support treatment decisions that are more informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the SARS2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so questions about side effects, new symptoms, or how medicines may affect you are best discussed with your doctor.
History
The SARS2 gene entered medical genetics through research on how mitochondria, the parts of cells that make energy, build their own proteins. Scientists identified it as the gene for mitochondrial seryl transfer RNA synthetase, one of a group of genes needed for this basic cell process. In 2011, researchers linked harmful variants in the SARS2 gene to HUPRA syndrome, a rare inherited condition marked by high uric acid levels, lung pressure changes, kidney problems, and alkalosis. From these first observations, research expanded steadily. This work helped place the SARS2 gene within the growing group of mitochondrial genes now recognized in rare childhood conditions.