The LRSAM1 gene helps nerve cells stay healthy by marking damaged proteins so cells can clear or recycle them. This gene plays an important role in the long nerves of the hands and feet, where steady cell upkeep matters most. When a harmful variant disrupts this process, some people develop an inherited nerve condition, often called Charcot-Marie-Tooth disease, with gradually increasing foot weakness, numbness, muscle loss, balance problems, and sometimes hand weakness. Symptoms often begin in adolescence or adulthood, although timing and severity can vary from person to person.
What is a gene?
A gene is a stretch of DNA that holds instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for producing proteins, the parts of cells that do the work. Other genes mainly help determine when certain processes happen, where they take place, and how strongly they run. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
LRSAM1Gene function
What if the gene works
The LRSAM1 gene helps cells tag certain proteins so they can be moved, recycled, or broken down. This supports normal cell housekeeping and helps maintain long nerve cells.
Risk
What if the gene does not work
Variants in the LRSAM1 gene are linked to Charcot-Marie-Tooth disease, an inherited nerve condition. People may develop slowly progressive weakness and reduced feeling in the feet and hands, with milder or more severe variants influencing onset and severity.
Treatment
What does that mean for your treatment
For people with a pathogenic or loss-of-function variant in the LRSAM1 gene, no treatment or drug choice is currently guided by this gene in clinical care. Research on the LRSAM1 gene is mainly aimed at understanding inherited peripheral nerve conditions, not at guiding approved medicines.
Conditions associated with LRSAM1
Gene function
What if the gene works
Inside your cells, the LRSAM1 gene helps manage routine cleanup and transport. Its protein adds signals that guide where some cell materials go next, whether for movement, reuse, or breakdown. Understanding what the LRSAM1 gene does in the body helps explain how cells, especially nerve cells, stay organized over time.
One of the main roles of the LRSAM1 gene is to add small tags to selected proteins. These tags help the cell direct proteins toward transport, recycling, or removal.
The LRSAM1 gene supports endosomes (tiny sorting compartments inside cells). This helps cell cargo move to the right place after it has been taken in from the cell surface.
By linking tagging with sorting, the LRSAM1 gene helps keep routine cell cleanup running smoothly. This supports the normal turnover of cell materials, especially in cells that stay active for many years.
What is a variant?
A genetic variant is a slight change in the DNA sequence of a gene. These changes are common and help create normal human diversity, including differences 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 situations, though, a variant can change how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the LRSAM1 gene can change the shape or length of its protein, often weakening its ability to attach small cellular tags to partner proteins. Some variants, especially those in the RING region, reduce this tagging activity, while truncating variants may remove key parts of the protein and have a larger impact. This helps explain why LRSAM1 gene variants and Charcot-Marie-Tooth disease can range from milder, later-onset nerve problems to earlier or more marked features in some families.
How variants are linked to conditions
Pathogenic variants in the LRSAM1 gene cause an inherited nerve condition called Charcot-Marie-Tooth disease, most often the axonal form known as Charcot-Marie-Tooth type 2P. In families described with LRSAM1 gene variants and Charcot-Marie-Tooth disease, symptoms can begin at different ages and vary in severity. Both dominant and recessive inheritance patterns have been reported, depending on the specific variant.
A variant is not necessarily a diagnosis
Variants in genes are a usual feature of human biology and are widely found across the population. Most do not directly affect health and instead represent 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 contribute. In other situations, though, one well-defined variant in a particular gene may be 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 risk related to the LRSAM1 gene. In families with a disease-causing change in LRSAM1, the main factor is whether that genetic change is present, while the age symptoms begin and how severe they are can vary from person to person.
Inheritance of LRSAM1 variants
The inheritance pattern for LRSAM1-related conditions can differ depending on the specific variant and condition involved. Most often, variants in the LRSAM1 gene linked to Charcot-Marie-Tooth disease are inherited in an autosomal dominant way, which means a parent carrying the variant can pass it to each child with a 50% chance. Some families have autosomal recessive LRSAM1-related neuropathy, where a child inherits one altered copy from each parent. In practical terms, the LRSAM1 inheritance pattern may involve one affected parent or two unaffected carrier parents.
What does my LRSAM1 result mean for my family?
LRSAM1 changes are linked to an inherited nerve condition called Charcot-Marie-Tooth disease, and the family meaning can differ because both dominant and recessive forms have been reported. In families with a dominant LRSAM1 result, close relatives such as a parent, brother, sister, or child may also carry the same change. In families with a recessive LRSAM1 result, brothers and sisters may be affected or be carriers, while parents are often carriers without symptoms.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for the LRSAM1 gene uses a blood sample or cheek swab to read the DNA code and look for variants linked to inherited nerve conditions. LRSAM1 genetic testing may be part of a neuropathy panel. Results show whether a variant is found, although the exact change shapes what it means.
When should I consider getting a genetic test?
Consider testing for the LRSAM1 gene if you or close relatives have signs of an inherited nerve condition, such as slowly worsening foot or hand weakness, numbness, balance problems, or high arches. A test may help confirm whether LRSAM1 is part of the cause when a doctor suspects Charcot-Marie-Tooth disease, a condition that affects the nerves in the arms and legs.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal depends on the condition and on the type of variant involved. Over time, the way the body works is shaped by many factors, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most useful when considered alongside other aspects of care. In other situations, a genetic result can give a clear answer. In areas such as 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. Two people can take the same treatment, yet one may get the expected benefit while the other may notice less effect or more side effects, partly because their bodies break down, move, or respond to the drug differently. These differences are common and are one reason medication response is not the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect the way someone responds to medication. By looking at connections between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. 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 LRSAM1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how medicines work, so questions about side effects, new symptoms after starting treatment, or whether a medicine is a good fit are best discussed with your doctor or pharmacist.
History
LRSAM1 entered the medical literature through research on inherited peripheral neuropathy, especially families with Charcot-Marie-Tooth disease type 2P. In recent decades, awareness of this gene’s role has grown as linkage studies first narrowed the search to a region on chromosome 9 and later sequencing identified disease causing variants in the LRSAM1 gene. These findings were important because they connected a long-observed inherited nerve condition to a specific genetic cause. From these first observations, research expanded steadily, and clinicians recognized that both dominant and recessive inheritance patterns could involve the LRSAM1 gene. That work helped place LRSAM1 within the broader history of gene discovery in inherited nerve conditions.