The SEMA6A gene helps guide growing nerve cells so brain and eye connections form in the right place during development. This gene plays an important role in the signals that tell cells where to move and which partners to connect with. If the SEMA6A gene does not work properly, these pathways may form less accurately, which can affect how the nervous system develops and functions.
What is a gene?
Genes are sections of DNA that provide instructions your cells use to make molecules or manage processes throughout the body. Some genes hold the directions for producing proteins, the parts of cells that do much of the work. Other genes are used mainly to regulate when certain processes take place, where they occur, and how strongly they operate. As a group, genes affect how the body develops and functions, and they can also influence how you respond to food, stress, and medications. If you want to go into this topic in greater depth, you can find more in the LearnHub.
Overview
SEMA6AGene function
What if the gene works
The SEMA6A gene helps guide growing nerve cells so the brain and nervous system form organized connections. It also supports signals that help cells move and organize during development.
Risk
What if the gene does not work
Variants in the SEMA6A gene can weaken semaphorin signaling, which helps guide growing nerve cells and cell positioning. Milder variants may partly reduce this signaling, while more severe variants can disrupt cell communication and connection patterns more strongly.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by a pathogenic or loss-of-function variant in the SEMA6A gene.
Gene function
What if the gene works
Your body uses the SEMA6A gene to help cells communicate during development, especially while the nervous system is being wired. Its protein sits on the cell surface and gives nearby cells directional cues. Understanding the SEMA6A gene’s function helps show how cells build organized connections and positions.
The SEMA6A gene makes a protein on the cell surface that lets neighboring cells exchange guidance cues. These signals work when cells touch, helping development stay organized and well timed.
In the developing nervous system, the SEMA6A gene helps growing nerve fibers choose direction and avoid the wrong path. This supports how the brain’s wiring develops and how nerve cells connect into stable circuits.
The SEMA6A gene also helps some cells move, stop, or settle in the right place as tissues take shape. This supports orderly tissue patterning, especially in the nervous system.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some cases, 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
Variants in the SEMA6A gene can change the semaphorin 6A protein’s shape, stability, or placement on the cell surface, which may weaken signaling between nearby cells. In practical terms, how SEMA6A gene variants affect protein function often depends on the change: milder variants may partly reduce receptor binding or protein trafficking, while more severe variants can markedly lower the amount of working protein or stop production altogether.
How variants are linked to conditions
Variants in the SEMA6A gene do not yet have a broadly confirmed link to a specific health condition, though this may change as research develops. Current evidence on how SEMA6A gene variants are linked to conditions is still emerging, so anyone with a confirmed finding in this gene should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
Genetic variants are common and are a normal part of human biology. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, a single well-characterized variant in a specific 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 risk related to the SEMA6A gene. If you have a SEMA6A finding on genetic testing or a family history that worries you, a doctor or genetic counselor can help explain what it may mean for your personal risk.
Inheritance of SEMA6A variants
There is not yet a broadly confirmed disease specific inheritance pattern for the SEMA6A gene, so the SEMA6A gene inheritance pattern is still being clarified as research develops. SEMA6A is located on chromosome 5, which is an autosome rather than a sex chromosome. That means you inherit one copy of the SEMA6A gene from your mother and one copy from your father.
What does my SEMA6A result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific condition for the SEMA6A gene, and understanding may change as research develops. If you have a specific SEMA6A result and questions about what it could mean for your family, a doctor or genetic counselor can help explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the SEMA6A gene usually uses a blood or saliva sample. A lab reads the DNA code and compares it with the usual sequence to look for changes. Results can show whether a variant is present, although the health meaning may differ from one variant to another.
When should I consider getting a genetic test?
There isn't yet a broadly established reason to order genetic testing just for changes in the SEMA6A gene. Testing decisions are usually based on your overall personal and family history and are best discussed with a doctor or genetic counselor.
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 the type of variant involved. Factors such as age, lifestyle, environment, and medical history also influence how the body functions over time. In some conditions, especially those shaped 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 such as medication response, genetic results can also help put personal experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. One person may break down a drug faster or slower than another, which can change how well it works or how likely side effects are. These differences are common and are one reason the same treatment can feel very effective for one person but less helpful or harder to tolerate for someone else.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that looks at how genetic differences shape a person’s response to medications. It examines relationships between genes and drugs to better explain why the same treatment can work differently from one person to another. For many medicines, genes affect both how strongly a drug works and how the body handles it. This understanding can support more informed and more individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the SEMA6A gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dosing, so any questions about side effects, new symptoms after starting a medicine, or concerns about how a treatment is working are best discussed with your doctor.