The ERBB3 gene helps cells receive growth and survival signals, especially during development and when tissues need repair. If it does not work properly, these signals may become too weak or too active, which can affect normal development or, in some cancers, help cells keep growing. The protein made by this gene helps your cells respond to nearby growth messages by partnering with related cell surface receptors, including HER2. Because of this role, the ERBB3 gene is closely studied in cancer biology and targeted treatment research.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions for making molecules or managing processes in the body. Some genes hold the information needed to make proteins, which are the working parts of cells. Other genes mostly help regulate when certain processes happen, where they happen, and how strongly they operate. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. To explore this topic in more detail, you can learn more in the LearnHub.
Overview
ERBB3Gene function
What if the gene works
The ERBB3 gene helps cells receive growth signals from their surroundings. Its protein works with partner proteins to guide cell growth, survival, and specialization, especially during early development and in tissues that renew themselves.
Risk
What if the gene does not work
Depending on the variant, reduced signaling from the ERBB3 gene can range from mild to more severe effects. More disruptive variants in the ERBB3 gene are linked to a rare inherited condition with joint contractures, heart problems, and delayed development.
Treatment
What does that mean for your treatment
No ERBB3-specific treatment or drug selection approach is currently established for pathogenic or loss-of-function variants in the ERBB3 gene. In cancer research, the ERBB3 gene is being studied as a treatment target and biomarker, including HER3-directed drugs under investigation.
Conditions associated with ERBB3
Gene function
What if the gene works
The ERBB3 gene helps cells receive and relay growth signals from their surroundings. This supports normal cell communication when tissues are growing, maturing, and maintaining themselves. Understanding ERBB3 gene function helps explain how cells coordinate everyday decisions about growth and survival.
The ERBB3 gene makes a receptor on the cell surface that picks up certain growth messages from nearby cells. This lets cells notice when it is time to grow, change, or stay active.
Its receptor usually works by pairing with related receptors on the cell surface, especially the receptor made from the ERBB2 gene. This partnership helps pass the message inward in a clear, coordinated way.
Once activated, ERBB3 helps switch on signaling pathways, which are step by step message routes inside the cell. These routes support balanced growth, energy use, and cell survival.
ERBB3 signaling also supports cell specialization, the process that helps immature cells take on their final jobs. This is part of normal development and everyday tissue maintenance.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and help shape normal human diversity, such as differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply reflect natural genetic variation. In some situations, however, a variant can change a gene’s function more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the ERBB3 gene can change the protein’s shape, stability, or ability to pair with partner receptors, which helps explain how variants in the ERBB3 gene affect cell signaling. Some missense variants have a milder effect and only partly reduce signaling. More severe variants, including truncating changes or variants that disrupt protein folding or delivery to the cell surface, can greatly reduce or abolish signaling through this pathway.
How variants are linked to conditions
ERBB3 gene variants are linked mainly to certain cancers, most often as acquired changes in tumor cells rather than inherited findings. Studies have found ERBB3 changes in breast, bladder, stomach, colorectal, and some lung cancers, as well as melanoma. These associations can help classify a tumor and may sometimes shape treatment planning.
A variant is not necessarily a diagnosis
Variants in genes are a routine part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect normal human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental influences are involved. In some situations, however, a single well understood 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 ERBB3 gene itself. Risk usually depends more on the exact genetic change, family history, and the condition involved, so anyone with concerns about personal risk should speak with a doctor or genetic counselor.
Inheritance of ERBB3 variants
For the rare conditions linked to the ERBB3 gene, inheritance is currently described as autosomal recessive. This means a child usually inherits one ERBB3 gene variant from each parent, and parents who carry one variant are often unaffected. When both parents are carriers, each pregnancy has a 25% chance of the child inheriting both altered copies, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practical terms, how ERBB3 gene variants are inherited follows the usual recessive pattern for genes on the non sex chromosomes.
What does my ERBB3 result mean for my family?
For ERBB3, the clearest family pattern is recessive, which usually means parents can be healthy carriers while a child is affected only after inheriting a changed copy from both sides. For relatives, this mainly matters for brothers, sisters, and other family members who may also be carriers, especially if they are planning children. The meaning for family members depends on the exact ERBB3 result and the condition linked to it.
Genetic information
Genetic testing
How you find out about variants
To check for variants in the ERBB3 gene, genetic testing uses a blood or saliva sample to read your DNA. This is how ERBB3 genetic testing works: a lab looks for specific variants or scans the whole gene, then reports whether a change was found and what it may mean for health.
When should I consider getting a genetic test?
There is not yet a widely used reason to test the ERBB3 gene on its own. Testing may come up as part of a broader cancer test or if a doctor is looking into a very rare inherited condition based on symptoms or family history.
A genetic result is only one part of your health story
A genetic result can provide meaningful insight, but how much it reveals depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other aspects of care. In other situations, a genetic result may give a clear answer. In areas such as medication response, genetic results can help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same treatment works well for one person, causes more side effects in another, or seems to have less effect in someone else. Part of the difference comes from inherited changes that influence how the body breaks down a drug, moves it through the body, or responds to it at its target. These differences are common and can shape both how well a treatment works and how sensitive a person may be to it.
What is Pharmacogenetics?
This field examines how genetic differences can affect the way a person responds to medications. It focuses on links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strong a drug’s effects are or how the body handles it. This information can support more informed, individualized treatment decisions. To explore this topic in more detail, you can learn more in the LearnHub.
Drugs influenced by the ERBB3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding routine medication choices, so questions about side effects, drug response, or new symptoms are best discussed with your doctor. ERBB3 has been studied mainly in cancer research, where changes in tumor ERBB3 may affect how some targeted cancer treatments work, but this is not a standard guide for everyday prescribing.