The AARS1 gene helps cells build proteins by attaching the amino acid alanine to a carrier molecule used during protein assembly. When it does not work properly, nerve cells may be affected most, which can lead to inherited nerve conditions with muscle weakness, numbness, or trouble walking, and in some children more widespread effects on development and seizures.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, the parts of cells that do much of the work. Others mainly help set when certain processes happen, where they take place, and how active they are. As a group, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
AARS1Gene function
What if the gene works
The AARS1 gene helps cells make proteins by attaching alanine, an amino acid, to transfer RNA. This supports normal growth, repair, and everyday cell activity.
Risk
What if the gene does not work
Variants in the AARS1 gene can cause nerve problems, often with weakness and wasting in the feet and hands. Milder variants may lead to later-onset Charcot-Marie-Tooth neuropathy, while more severe variants can cause early developmental delay, seizures, and liver involvement.
Treatment
What does that mean for your treatment
No AARS1-specific treatment or management approach is currently established. Treatment usually follows general symptom-based care, and AARS1 status does not currently guide a specific drug choice in clinical guidelines.
Conditions associated with AARS1
Gene function
What if the gene works
Your cells use the AARS1 gene every day to make proteins, which are needed for growth, repair, and routine body functions. A simple way to understand how the AARS1 gene helps make proteins is that it prepares the amino acid alanine for use during protein production. This steady background work supports normal cell activity across the body.
Its protein helps start the use of alanine, one of the small building blocks your body uses to make proteins. This supports the constant protein production cells need for maintenance, repair, and daily work.
This protein attaches alanine to transfer RNA (a small carrier used in protein making). That matching step helps place the right ingredient into a growing protein at the right time.
Its protein also checks that alanine has been paired correctly before it is used. This helps keep protein assembly accurate and supports smooth day to day cell function.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including variations in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some cases, however, a variant can change 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 AARS1 gene can alter the enzyme’s shape, stability, or ability to bind alanine and transfer RNA, which lowers its activity inside cells. These changes show how variants in the AARS1 gene affect protein function in cells: some milder variants leave partial activity, while more severe variants can cause marked loss of activity or a less stable protein. In some people, the degree of functional change may influence how early or strongly related features appear.
How variants are linked to conditions
Disease-causing variants in the AARS1 gene are best known for causing Charcot-Marie-Tooth disease type 2N, an inherited nerve condition that often leads to slowly progressive weakness and muscle wasting in the feet, legs, and sometimes the hands. This AARS1 gene and Charcot-Marie-Tooth disease link is the main well-established association, and symptoms and age at onset can vary across affected families.
A variant is not necessarily a diagnosis
Genetic variants are common across people and are a normal feature of human biology. Most do not directly affect health and simply contribute to natural human diversity. 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 play a role. In some situations, though, one well-characterized variant in a particular 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 risks linked to the AARS1 gene. Personal risk mainly depends on the exact gene change and family history, so people with concerns about AARS1 should speak with a doctor or genetic counselor.
Inheritance of AARS1 variants
AARS1-related conditions can follow more than one inheritance pattern, so how AARS1 variants are inherited in families depends on the specific condition and the variant involved. Some AARS1 gene variants linked to peripheral nerve disease are inherited in an autosomal dominant pattern, which means a parent carrying the variant can pass it to a child with a 50% chance in each pregnancy. Other AARS1 gene variants are associated with autosomal recessive conditions, where a child inherits one variant from each parent. Since the AARS1 gene is on chromosome 16, it is inherited equally by people of any sex.
What does my AARS1 result mean for my family?
For AARS1, family implications can differ because this gene has been linked to more than one inherited condition. In some families, a changed AARS1 copy can be passed down and close relatives may also carry the same result, while in other situations both parents may be healthy carriers and siblings could still be affected. What this means for your relatives depends on the exact AARS1 change and the condition tied to it.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a change in the AARS1 gene, doctors use genetic testing for AARS1 variants on a blood or saliva sample. A lab reads the gene's DNA code and reports whether a variant was found, which can help clarify a diagnosis or show whether a condition in a family is linked to this gene.
When should I consider getting a genetic test?
Consider testing if you or a close relative has unexplained nerve problems, such as slowly worsening foot weakness, frequent tripping, numbness, or muscle wasting, especially when these problems run in the family. Testing may also be part of the evaluation for a child with early developmental delays, seizures, or other serious brain or nerve symptoms when doctors suspect a genetic cause.
A genetic result is only one part of your health story
A genetic result can provide useful information, but how much it explains depends on the condition and the specific type of variant. Over time, many factors, including lifestyle, environment, age, and medical history, also affect how the body works. For some conditions, especially those influenced 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 make individual experiences easier to understand.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body handles medicines, so the same treatment may work differently from one person to another. Some people break down a drug faster or more slowly, while others are more or less sensitive to its effects. This can influence how well a medicine works and how likely side effects are.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. By studying the relationship 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 the body processes a drug and how strong its effects are. This information can support more informed, individualized treatment decisions. For a closer look at this topic, more information is available in the LearnHub.
Drugs influenced by the AARS1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so any concerns about side effects, medicine response, or starting a new treatment are best discussed with your doctor or pharmacist.
History
AARS1 entered medical genetics through work on a wider family of genes that help cells build proteins, a process mapped out across the second half of the 20th century. In recent decades, awareness of this gene’s role has grown as researchers connected AARS1 variants with inherited nerve conditions, especially forms of Charcot-Marie-Tooth disease. From these first observations, research expanded steadily, showing that changes in one protein-building gene could affect the peripheral nerves in very specific ways. Scientific classifications changed as researchers learned more about the gene, and some findings were later refined as more families were studied. Today, AARS1 is recognized as part of a broader story in which basic laboratory science led to clearer diagnosis of inherited neurologic conditions.