The GPSM2 gene helps cells orient themselves correctly as they divide, which is especially important in the developing inner ear and brain. The protein made by this gene helps your cells keep growth organized. If the gene does not work properly, it can lead to a condition called Chudley-McCullough syndrome, which often includes hearing loss from birth and brain changes seen on scans. Some people may also have balance or developmental differences, although this can vary.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes carry the information needed to produce proteins, the working parts of cells. Others mainly control when certain processes take place, where they happen, and how strongly they run. Taken together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. For a more in-depth look at this topic, you can learn more in the LearnHub.
Overview
GPSM2Gene function
What if the gene works
The GPSM2 gene helps cells line up their internal machinery so they divide in the right direction. This supports normal development, especially in the inner ear and brain.
Risk
What if the gene does not work
When the GPSM2 gene does not work properly, it is linked to hearing loss present from birth and changes in brain development. Milder and more severe variants can influence which features appear and how early or strongly they show up.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by a pathogenic variant in the GPSM2 gene. Care is based on a person's symptoms, such as hearing support and developmental care, rather than a therapy targeted to the GPSM2 gene.
Conditions associated with GPSM2
Gene function
What if the gene works
Your cells use the GPSM2 gene to keep division organized and properly directed. It helps a cell maintain its internal layout and place the machinery that separates chromosomes. Understanding what the GPSM2 gene does helps explain how tissues grow in an orderly way.
The protein from the GPSM2 gene helps cells keep a clear sense of direction, sometimes called polarity. This internal layout tells a cell where its top, bottom, and edges should be so it stays organized within a tissue.
GPSM2 helps position the spindle, the set of fibers that separates chromosomes during cell division. This lets a cell divide along the right plane so new cells are placed neatly in growing or renewing tissues.
This gene supports divisions that produce two new cells with different jobs. That helps tissues build the right mix of cells while keeping their overall structure orderly.
What is a variant?
A genetic variant is a minor change 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 responds 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 works to a greater extent and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Variants in the GPSM2 gene often reduce how well the protein can guide cell polarity and spindle positioning, the system that helps cells line up and divide in the right direction. In plain terms, how GPSM2 gene variants affect protein function depends on the change: milder variants may partly weaken protein stability or binding, while more severe variants can truncate the protein or stop it being made. Less remaining activity is linked to earlier or clearer hearing and brain findings.
How variants are linked to conditions
Pathogenic variants in the GPSM2 gene are best known for causing Chudley-McCullough syndrome, so GPSM2 gene variants are mainly linked to a rare inherited condition with sensorineural hearing loss and distinctive brain changes on MRI. This diagnosis is usually confirmed when a person has disease-causing variants in both copies of the gene. Some people also have developmental differences, balance problems, or delayed milestones, while others are affected more mildly outside of hearing.
A variant is not necessarily a diagnosis
Variants are a usual feature of human biology and are widely found across the population. Most do not directly affect health and instead reflect normal human variation. For many genes, having a variant associated with a condition points to a possible link, not a certain diagnosis, particularly when several genes and environmental influences also play a role. In some situations, though, one well-described variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For GPSM2, risk is mainly shaped by inheritance rather than lifestyle. A child’s chance of having a GPSM2-related condition is higher when both biological parents carry a harmful GPSM2 change; in that situation, each pregnancy has a 1 in 4 (25%) chance of the child being affected.
Inheritance of GPSM2 variants
Variants in the GPSM2 gene are inherited in an autosomal recessive pattern. In practical terms, how variants of the GPSM2 gene are inherited usually means a child must receive one altered copy from each parent to have a GPSM2-related condition. Parents who each carry one variant are often unaffected themselves, and with each pregnancy there is a 25% chance the child will inherit both variants, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither variant. Because GPSM2 is on an autosome, this pattern is the same for boys and girls.
What does my GPSM2 result mean for my family?
For GPSM2, family implications are usually tied to a recessive inherited condition. This often means parents of an affected child are healthy carriers, and brothers or sisters may also be carriers or, less often, have the condition. Other close relatives on both sides of the family may also carry the changed gene.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the GPSM2 gene uses a blood or saliva sample. A lab reads the DNA sequence to look for changes that can help explain hearing loss or confirm a suspected inherited condition. Results may show a known variant, no relevant variant, or a finding that needs expert interpretation.
When should I consider getting a genetic test?
Consider GPSM2 testing if a child has hearing loss from birth or early childhood, especially when brain scans also show unusual findings or there is a family history of similar hearing problems. It can also help clarify whether both parents carry a change in the gene when a child is affected.
A genetic result is only one part of your health story
A genetic result can provide helpful insight, yet how much it explains depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can also help put individual experiences into context.
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 body, or responds to it at its target. This helps explain why the same medication works well for one person, has less effect in another, or causes more side effects in someone else. These differences are common and are one part of the bigger picture, along with age, other health conditions, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. It studies connections 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 strongly a drug works or how the body handles it. This information can support more informed, individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the GPSM2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines work, so questions about side effects, treatment choices, or new symptoms are best discussed with your doctor.
History
GPSM2 entered medical genetics through studies of families with a rare inherited pattern of hearing loss and brain imaging changes later recognized as Chudley-McCullough syndrome. In recent decades, awareness of this gene’s role has grown. Researchers linked pathogenic variants in the GPSM2 gene to this condition in the early 2010s, which gave families a clearer genetic explanation for findings that had long been described clinically. Around the same time, laboratory studies were also examining GPSM2 in cell division, helping place the gene within a broader area of genetics research. These historical steps shaped today’s understanding and turned GPSM2 from a research gene into one with direct clinical relevance.