The CAB39 gene helps cells manage energy and growth signals, especially during early brain development. When this gene does not work properly, it can disrupt how nerve cells grow and communicate. Rare harmful variants in the CAB39 gene are linked to a genetic condition that may cause developmental delay, learning difficulties, speech delay, seizures, and differences in head size or growth. Effects vary from person to person, and genetic results help clarify whether CAB39 is the cause.
What is a gene?
Genes are segments of DNA that carry instructions your cells use to make molecules or direct processes in the body. Some genes hold the information needed to produce proteins, the parts of cells that do much of the work. Other genes are used mainly to control when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. To explore this topic in more detail, you can visit the LearnHub.
Overview
CAB39Gene function
What if the gene works
The CAB39 gene helps organize signals that control how cells use energy, grow, and keep their shape. It supports the LKB1 pathway, which helps cells respond to everyday stress and stay balanced.
Risk
What if the gene does not work
Pathogenic variants in the CAB39 gene can cause a neurodevelopmental condition with delayed speech and motor skills, low muscle tone, and learning difficulties. Milder or more severe variants may change when features appear and how strongly they affect development.
Treatment
What does that mean for your treatment
For a pathogenic or loss-of-function variant in the CAB39 gene, no gene-specific treatment or management approach is currently established. CAB39 is being studied as a possible biomarker or drug target in cancer-related cell growth pathways, but this has not led to guideline-based treatment choices.
Gene function
What if the gene works
Your cells use the CAB39 gene to keep important signaling pathways steady and well coordinated. Its protein acts as a helper that brings other proteins together so they can switch on at the right time. This steady teamwork explains what the CAB39 gene does in cells every day, including energy use, cell layout, and organized growth signals.
CAB39 helps a control protein called LKB1 work in a stable group with its partners. This makes it easier for important cell signals to turn on in a coordinated way.
CAB39 supports pathways that read how much energy a cell has available. This helps cells match energy use to routine tasks such as movement, repair, and growth.
CAB39 also supports cell polarity, which is the organized layout that helps a cell know top from bottom. This is part of how tissues keep their normal structure and order.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, 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
Changes in the CAB39 gene can make the protein less stable or weaken how well it attaches to its partner proteins in the LKB1 complex, a cell-control system linked to growth and energy balance. In studies of how CAB39 gene variants affect cell signaling, some single-letter DNA changes partly reduce this interaction, while more disruptive variants can greatly lower protein levels or stop the complex from forming.
How variants are linked to conditions
CAB39 does not yet have a broadly confirmed link to a specific health condition, though research on CAB39 gene variants and health conditions is still developing. If you carry a confirmed variant in the CAB39 gene, your doctor or genetic counselor can explain what it may mean in the context of your own health and family history.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common in the general population. Most have no direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible association rather than a definite diagnosis, especially when multiple genes and environmental factors are involved. In some cases, 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 isn't yet broadly confirmed evidence on specific factors that increase or reduce risk related to the CAB39 gene. Anyone with concerns about personal or family risk can speak with a doctor or genetic counselor.
Inheritance of CAB39 variants
For families looking into how CAB39 gene variants are inherited, the best supported pattern at present is autosomal dominant. This means a variant in one copy of the CAB39 gene can be enough to cause a CAB39 related condition. If a parent carries the variant, each child has a 50% chance of inheriting it. Some people with a CAB39 related condition have a new (de novo) variant, which means it arose for the first time in them rather than being passed down from either parent.
What does my CAB39 result mean for my family?
For recognized CAB39-related conditions, the family pattern is usually dominant, which means close relatives such as parents, brothers, sisters, and children may also carry the same gene change. Some cases happen as a new change in the child and are not inherited from either parent, so a parent does not always have the variant.
Genetic information
Genetic testing
How you find out about variants
To find out about variants, CAB39 genetic testing reads the CAB39 gene from a blood sample, saliva, or cheek swab. It is usually done as part of a multigene panel, whole exome sequencing, or whole genome sequencing, and the result may show a disease causing variant, a harmless change, or a variant of uncertain significance (an unclear result).
When should I consider getting a genetic test?
There is not yet a broadly established reason to order genetic testing just for the CAB39 gene. Testing decisions are usually based on the full picture, such as developmental delays, unusual health findings, or family history, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic finding can offer useful information, but what it reveals depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. In some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best understood together with other aspects of care. In other situations, a genetic result may give a clear answer. In areas like 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. Small differences in DNA can change how the body breaks down a drug, moves it through the bloodstream, or responds to it at its target. That helps explain why the same medication works well for one person, works less well for another, or causes more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medications. It studies links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This understanding can support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the CAB39 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 questions about side effects, new symptoms, or whether a treatment is right for you are best discussed with your doctor or pharmacist.
History
In recent decades, awareness of this gene’s role has grown. CAB39 was first studied in cell signaling research, where scientists identified it as a helper protein that works with key growth and energy-control pathways. It was also known by the earlier name MO25, and later research clarified its place within a broader family of related proteins. Building on this early work, scientists linked the CAB39 gene to the LKB1 signaling network, an important area in cancer and metabolism research. As medical science evolved, so did understanding of this gene. Its history is mainly a scientific one, shaped by steady laboratory discoveries rather than a single public event.