The AARS2 gene helps mitochondria, the energy centers in cells, make proteins so the body can produce energy. When both copies of the AARS2 gene do not work properly, tissues with high energy needs may be affected, leading to problems such as heart muscle weakness in infancy or a brain white matter condition called leukodystrophy later on. Some people, especially females, may also have ovarian failure, which can affect puberty or fertility.
What is a gene?
Genes are sections of DNA that give cells information they can use to make molecules or regulate processes in the body. Some genes carry instructions for building proteins, which are the working parts of cells. Others mainly help determine when certain processes take place, where they happen, and how strongly they run. Taken together, genes influence body development and function, and they can shape how you respond to food, stress, or medications. For a deeper look at this topic, you can read more in the LearnHub.
Overview
AARS2Gene function
What if the gene works
The AARS2 gene helps mitochondria, the cell’s energy makers, build proteins. This supports energy production, especially in tissues with high energy needs like the brain, heart, and muscles.
Risk
What if the gene does not work
Variants in the AARS2 gene can reduce mitochondrial energy production. More severe variants often cause heart weakness in infancy and organ failure, while milder variants may lead later to leukodystrophy, movement or thinking changes, and ovarian failure in some females.
Treatment
What does that mean for your treatment
For pathogenic variants in the AARS2 gene, no treatment or drug selection approach linked specifically to this gene is currently established in clinical guidelines. Care is based on the person’s symptoms and may include standard treatment for neurologic, heart, or hormone related features.
Conditions associated with AARS2
Gene function
What if the gene works
Your cells need a steady energy supply to do everyday work. The AARS2 gene helps mitochondria, the parts of cells that make most of that energy, build a small set of proteins they need. Understanding AARS2 gene function helps show how cells keep energy production moving in a controlled way.
The AARS2 gene helps attach alanine, a protein building block, to mitochondrial transfer RNA. This prepares alanine to be placed into a new protein at the right moment.
Inside mitochondria, the AARS2 gene supports mitochondrial protein production by helping the cell use alanine correctly during protein assembly. This allows a small but important set of mitochondrial proteins to be made as planned.
By helping mitochondria make their own proteins, the AARS2 gene supports everyday energy production. This routine job is part of how cells keep up with the constant energy demands of daily life.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal differences among people, such as appearance, metabolism, or the way the body reacts to environmental factors. Many do not have any noticeable effect and are simply part of natural genetic variation. At times, though, a variant changes how a gene works more strongly and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Many variants in the AARS2 gene alter the protein's shape, stability, or amount, and some disrupt how the gene's instructions are pieced together, so cells make little or no working protein in mitochondria, the parts of cells that make energy. Milder AARS2 gene variants may leave activity, while more severe variants can cause loss of function, which can help explain why symptoms may start later and stay milder or appear earlier and affect more organs.
How variants are linked to conditions
Pathogenic variants in the AARS2 gene can cause two main inherited conditions: an early onset mitochondrial disease with cardiomyopathy in infancy, and a later onset leukoencephalopathy that may occur with loss of ovarian function in females. In practice, this means AARS2 gene variants linked to leukoencephalopathy can affect movement, thinking, and hormone function, while other variants lead to heart disease early in life. These conditions usually appear when a person has disease causing variants in both copies of the gene.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of being human and are widely seen across the population. Most do not directly affect health and simply reflect normal human variation. For many genes, having 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 confirm the diagnosis.
Are there things that can increase or change my risk?
For AARS2, risk is mainly linked to inheriting harmful changes in both copies of the gene, so it is largely determined by genetics rather than lifestyle. There is not yet broadly confirmed evidence on specific outside factors that clearly increase or reduce AARS2-related risk.
Inheritance of AARS2 variants
AARS2-related conditions are inherited in an autosomal recessive pattern. This means a person usually develops the condition only when both copies of the AARS2 gene carry a disease-causing variant, with one altered copy inherited from each parent. In families asking about the AARS2 inheritance pattern, two carrier parents have a 25% chance with each pregnancy of having an affected child, a 50% chance of having a carrier child, and a 25% chance of having a child without the familial variants. Parents of an affected child are typically unaffected carriers.
What does my AARS2 result mean for my family?
For families with an AARS2-related condition, the pattern is usually recessive, which means parents are often healthy carriers and brothers or sisters may also be affected or be carriers. Close relatives may want to learn whether the same gene change runs in the family, especially if there is a history of early heart disease, movement or walking problems, or ovarian failure. Children of someone with an AARS2-related condition will usually be carriers unless the other parent also carries an AARS2 change.
Genetic information
Genetic testing
How you find out about variants
AARS2 genetic testing looks for changes in the AARS2 gene using blood, saliva, or a cheek swab. A lab reads the DNA sequence to see whether a variant is present. Results may show no relevant variant, a known variant linked to a condition, or an uncertain finding.
When should I consider getting a genetic test?
Genetic testing for the AARS2 gene can be worth considering when someone has signs of a rare inherited condition affecting the brain, heart, or ovaries, especially if similar problems run in the family. It can also help explain unexplained brain scan changes, early loss of normal ovary function, or severe heart weakness starting in infancy or childhood.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the type of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, affect how the body functions. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most helpful when considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as 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. A treatment that works well for one person may work less well for another, or may cause more side effects, because the body can absorb, break down, or handle drugs in different ways. These differences are common and can influence both how strongly a medicine works and how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes affect the way medications work. By studying links between genes and drugs, it helps explain why the same treatment can have different effects in different people. For many medicines, genes influence both how the body handles a drug and how strong its effects may be. This information can support treatment choices that are more informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the AARS2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response. Questions about side effects, medication changes, or your overall health are best discussed with your doctor or pharmacist.
History
AARS2 entered the medical literature as part of the growing study of genes involved in mitochondrial disease, a field that expanded rapidly in the early 2000s. Initially, researchers linked pathogenic variants in the AARS2 gene to infants with severe heart problems, which helped establish it as a disease related gene. From these first observations, research expanded steadily. Later reports showed that changes in the same gene could also be tied to a brain white matter condition in adults, often with ovarian failure in some women. These findings made AARS2 an important example of how one gene can be connected to different health patterns across the lifespan.