The METRN gene helps make a signaling protein that supports nerve cells, their support cells, and some blood vessel growth. If this gene does not work as expected, those growth and repair signals may be less balanced, which can affect how parts of the nervous system develop or respond to stress. This gene plays an important role in cell communication in the brain and spinal cord. Variants in the METRN gene are also being explored for possible links to brain and metabolic health.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some of these genes provide the directions for producing proteins, the working parts of cells. Others mainly control when certain processes happen, where they take place, and how strongly they run. Taken together, 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 information in the LearnHub.
Overview
METRNGene function
What if the gene works
The METRN gene helps make meteorin, a signaling protein active in the brain and nervous system. It supports the growth and maturation of nerve cells and nearby support cells.
Risk
What if the gene does not work
Variants in the METRN gene can range from milder to more severe and may reduce or disrupt signals that help support cells in the nervous system mature and guide growing nerve fibers.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided by a pathogenic variant in the METRN gene in clinical guidelines. Early research is exploring the METRN gene as a biomarker and possible drug target in some cancers and in nerve repair, but this is not part of routine care.
Gene function
What if the gene works
From early development onward, the METRN gene helps nearby cells communicate, especially in the nervous system. Much of the METRN gene function in the brain involves helping support cells mature and guiding growing nerve cells. Its protein is released outside the cell, where other cells can respond to it.
The METRN gene makes a protein that is released outside cells and acts as a local signal. This helps nearby cells coordinate growth and routine tissue development.
One of the main jobs of the METRN gene is helping immature brain cells become astrocytes, a type of support cell. Astrocytes help nourish neurons and keep the brain environment balanced.
The METRN gene also supports the growth of neurites (the early branches that become nerve fibers). This helps developing neurons reach other cells and build communication pathways.
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 reacts to environmental influences. Many variants do not have 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
Research on how variants in the METRN gene affect protein function suggests a spectrum of effects. Milder changes may slightly alter the protein’s shape or stability, which can reduce how well it is secreted or interacts with other molecules. More disruptive variants, including stop, frameshift, or splice changes, can markedly lower METRN protein levels or create a shortened protein that is quickly broken down.
How variants are linked to conditions
At present, the METRN gene does not yet have a broadly confirmed link to a specific health condition, and research on METRN gene variants and health conditions is still developing. Anyone with a confirmed change in the METRN gene should use guidance from their doctor or genetic counselor to understand what it may mean for their own health.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors contribute. In some situations, though, a single well-characterized variant in a specific gene can be 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 risk related to the METRN gene. Any effect of METRN changes is likely to depend on the exact variant and on many other genes and life factors. Anyone concerned about personal or family risk should speak with a doctor or genetic counselor.
Inheritance of METRN variants
There is not yet a broadly confirmed Mendelian inheritance pattern tied to a specific METRN-related condition, so how METRN gene variants are inherited in disease is still being clarified. The METRN gene is located on chromosome 16, which is an autosome rather than a sex chromosome. That means each person usually inherits one copy of the METRN gene from their mother and one copy from their father.
What does my METRN result mean for my family?
There is not yet a broadly confirmed inherited pattern linking METRN to a specific recognized genetic condition in families. If you have a METRN result and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your exact result and family history.
Genetic information
Genetic testing
How you find out about variants
Variants in the METRN gene are found with genetic testing for variants in the METRN gene, usually using a blood sample or saliva. A lab reads the DNA sequence and compares it with a reference sequence to look for changes. Results may show a variant, no variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
There is not yet a broadly established, METRN-specific reason for genetic testing in routine care. Decisions about testing are best made with a doctor or genetic counselor, based on your own health history and your family history.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but the amount it explains depends on the condition and on the kind of variant present. How the body functions over time is also shaped by many other factors, including lifestyle, environment, age, and medical history. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and makes the most sense when viewed alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results may also help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body handles some medicines, including how quickly a drug is broken down, how strongly it works, or how likely side effects are. This helps explain why the same treatment can work well for one person but less well for another. These differences are common and are one part of the reason medication response varies alongside age, liver and kidney function, other health conditions, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape the way people respond to medications. It studies the relationship between genes and drugs to help explain why the same treatment works differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body processes it. This information can support more informed and more individualized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the METRN gene
When should I seek medical advice?
There is not yet a broadly confirmed role for changes in this gene in how medicines work, so concerns about side effects, new symptoms, or treatment choices are best discussed with your doctor.