The KIF11 gene helps cells divide by moving genetic material into the right place as new cells form. If this gene does not work properly, early growth can be affected, especially in the brain, eyes, and lymph vessels, which may lead to a smaller head size, vision changes, swelling of the hands or feet, and developmental differences. The protein made by this gene helps your cells keep growth organized during fetal development and beyond.
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 genes hold the information needed to make proteins, the parts of cells that do much of the work. Others mainly help direct when certain processes take place, where they happen, and how strongly they occur. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
KIF11Gene function
What if the gene works
The KIF11 gene helps cells divide in an orderly way. It provides instructions for a motor protein that moves along internal cell tracks and helps build the spindle, the structure that pulls chromosomes apart during division.
Risk
What if the gene does not work
Variants in the KIF11 gene can disrupt brain, eye, and lymph vessel development. People may have head size below average, vision problems from retinal changes, and swelling of the feet or legs, with effects ranging from mild to marked.
Treatment
What does that mean for your treatment
For people with a pathogenic or loss-of-function variant in the KIF11 gene, no treatment or management approach tailored to this gene is currently established. In cancer research, the KIF11 gene is also being studied as a drug target because blocking its protein can slow cell division, but that work is separate from care for inherited KIF11-related conditions.
Conditions associated with KIF11
Gene function
What if the gene works
When cells get ready to split into two, they need a careful internal transport system. The KIF11 gene gives cells instructions for a motor protein that moves along tiny support fibers called microtubules. Understanding how the KIF11 gene helps cells divide makes its day to day role easier to picture.
One of the main jobs of the KIF11 gene is to help build the spindle, the structure that organizes chromosomes during cell division. Its protein moves along microtubules and helps arrange them into the right shape.
During division, this gene helps push the two spindle poles apart so the cell can form a balanced working setup. That spacing helps the division machinery operate in an orderly way.
The KIF11 gene supports the even positioning of chromosomes before a cell splits. By keeping the spindle steady, it helps cells guide each set of chromosomes toward the future daughter cells.
What is a variant?
A genetic variant is a minor difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene functions more substantially and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the KIF11 gene can alter the motor protein’s shape, stability, or ability to move along microtubules, which helps explain how KIF11 gene variants affect cell division. Some variants leave partial activity, while more disruptive variants can sharply reduce or stop protein function, often through a shortened or unstable protein. This loss of function can weaken spindle assembly during cell division, and stronger functional effects may be linked to earlier or more pronounced KIF11-related features.
How variants are linked to conditions
Among conditions linked to KIF11 gene variants, the main diagnosis is a syndrome with microcephaly (a smaller than expected head size), eye changes that can affect vision, lymphedema (swelling caused by lymph fluid), and sometimes intellectual disability. Pathogenic variants in the KIF11 gene are also linked to familial exudative vitreoretinopathy (an inherited disease of the retina, the light sensitive tissue at the back of the eye). Symptoms can vary widely, even among relatives carrying the same variant.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widespread in the general population. Most do not have a direct effect on health and simply contribute to natural 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 factors also play a role. 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?
For KIF11, risk is mainly linked to whether someone carries a disease-causing change in the gene, and features can vary a lot even within the same family. Specific outside factors that reliably increase, reduce, or change that risk have not been clearly established.
Inheritance of KIF11 variants
KIF11-related conditions are usually inherited in an autosomal dominant pattern, which means a person needs one altered copy of the KIF11 gene to have the condition. If a parent carries a disease-causing KIF11 variant, each child has a 50% chance of inheriting it. Some families looking into how KIF11 variants are inherited find that the variant was new in the affected person and was not passed down from either parent. A parent who carries the variant can pass it to sons or daughters.
What does my KIF11 result mean for my family?
For KIF11, the main recognized pattern is dominant, which means a parent, child, brother, or sister could also carry the same gene change and may want to learn whether it is present in them too. In families where a parent has the variant, each child has a 1 in 2 chance of inheriting it. Some KIF11 changes happen for the first time in one person, so a parent is not always the source.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the KIF11 gene, genetic testing usually reads DNA from a blood sample or saliva and checks the gene for changes. This kind of genetic testing for KIF11 variants can confirm whether a specific change is present and may help explain a diagnosed condition or a family history.
When should I consider getting a genetic test?
Consider KIF11 testing if a child or adult has a pattern of very small head size, eye or retina problems, swelling of the legs or feet, or developmental delay, especially when these features run in the family. Testing can also help clarify the cause of inherited retinal disease linked to KIF11.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it explains depends on the specific condition and the type of variant involved. Over time, how the body works is also shaped by many factors, including age, lifestyle, environment, and medical history. In some conditions, especially those influenced by many genes, genetic information adds context rather than certainty and is best interpreted alongside other parts of care. In other situations, a genetic result can 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 absorbs, breaks down, transports, or responds to a drug. This helps explain why the same treatment 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 looks at how differences in genes can shape a person’s response to medications. By examining connections between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medicines, genes can affect how strongly a drug works or how the body processes it. This information can support more informed, individualized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the KIF11 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dosing. For questions about side effects, new symptoms, or how medicines may affect you, talk with your doctor or pharmacist.
History
In the 1990s, researchers identified the KIF11 gene as the human version of a spindle motor protein first studied in other species during cell division research. From these first observations, research expanded steadily. Interest in the KIF11 gene grew further when scientists recognized it as a useful target in cancer drug development, which brought it into a broader biomedical spotlight. A major clinical milestone came in 2012, when variants in the KIF11 gene were linked to a rare inherited condition involving small head size, eye changes, and sometimes swelling of the limbs. That discovery helped connect laboratory findings with real family health patterns and gave doctors a clearer genetic explanation for a condition that had previously been harder to define.