The KIF22 gene gives your cells instructions for a protein that helps chromosomes line up and separate during cell division. The protein made by this gene helps your cells divide in an orderly way, which is especially important while bones and joints are developing. A harmful variant in the KIF22 gene can disrupt this process and is linked to a genetic skeletal condition with short stature, changes in the spine and hips, joint looseness, and unusually long fingers.
What is a gene?
A gene is a stretch of DNA that holds information cells use to make molecules or regulate processes in the body. Some genes provide the instructions for producing proteins, the parts of cells that carry out much of their work. Other genes mainly guide when certain processes happen, where they happen, and how strongly they take place. As a whole, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a deeper look at this topic, you can read more in the LearnHub.
Overview
KIF22Gene function
What if the gene works
The KIF22 gene helps cells divide by guiding chromosomes into place during mitosis, the process of making new cells. Its protein also supports the spindle, the structure that pulls genetic material apart.
Risk
What if the gene does not work
Variants in the KIF22 gene are linked to a bone growth condition affecting the spine and the ends of long bones. People may have short stature, joint looseness, and finger changes, with features ranging from mild to more marked.
Treatment
What does that mean for your treatment
A pathogenic variant in the KIF22 gene does not currently change treatment or drug choice in any guideline-backed, KIF22-specific way. Care is guided by the person’s symptoms, and the KIF22 gene is also being studied in cancer research as a possible biomarker and drug target.
Conditions associated with KIF22
Gene function
What if the gene works
When cells get ready to split, the KIF22 gene helps keep chromosome movement organized. Its protein works like a tiny motor on the cell’s internal tracks during cell division. This supports accurate positioning of chromosomes before one cell becomes two. Understanding how the KIF22 gene helps cells divide makes its day to day role easier to picture.
The KIF22 gene helps guide chromosomes toward the middle of a dividing cell. This balanced positioning gives each new cell the same full set of chromosomes.
Its protein moves along the cell’s internal fibers and gently pushes chromosome arms into place. This motion helps chromosomes spread out and line up in an orderly way.
During cell division, the KIF22 gene works with the spindle, the structure that separates chromosomes. This keeps chromosome movement controlled until the cell is ready for the final pull apart.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some situations, however, a variant can change how a gene works more substantially and may contribute to, or directly cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the KIF22 gene can alter protein function during cell division, often by changing the protein enough that it stays active at the wrong time and pulls chromosomes out of position. Most reported harmful variants are small DNA changes that alter one protein building block rather than removing the protein entirely. Variants that interfere more strongly with switching the protein off may disturb cells that help shape growing bones and can be linked to earlier or more noticeable bone findings.
How variants are linked to conditions
Pathogenic variants in the KIF22 gene cause a rare bone growth condition called spondyloepimetaphyseal dysplasia with joint laxity, leptodactylic type 2. This diagnosis is linked with short stature, spine and hip changes, loose joints, and long slender fingers. In practice, conditions linked to KIF22 gene variants mainly refer to this skeletal condition rather than a wide range of unrelated diseases.
A variant is not necessarily a diagnosis
Gene variants are a normal part of being human and are widely seen in the general population. Most do not have a direct effect on health and simply reflect natural human variation. For many genes, carrying a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors also play a part. In some situations, though, a single well understood variant in a specific gene is enough to establish a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific lifestyle or environmental factors that increase or lower health risks related to the KIF22 gene. For the rare bone growth condition linked to harmful KIF22 changes, risk is mainly tied to whether the gene change is present, often because it happened new in a child or was passed down in a family.
Inheritance of KIF22 variants
For families looking into how KIF22 gene variants are inherited, the well-established pattern is autosomal dominant. This means a person with a disease-causing variant in one copy of the KIF22 gene can pass it to each child with a 50% chance in every pregnancy, regardless of sex. Some people with a KIF22-related skeletal condition have a new, de novo variant, which means it began in them and was not inherited from either parent.
What does my KIF22 result mean for my family?
For KIF22, the best-known related condition follows a dominant family pattern, so a parent, brother, sister, or child could also carry the same gene change. In many families, a KIF22 change happens for the first time in one person rather than being inherited from a parent. Even so, once a disease-causing KIF22 change is present, it can be passed on to children.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for KIF22 variants is usually done on a blood or saliva sample. A lab reads the KIF22 gene as part of a skeletal condition panel or a broader test such as exome sequencing, and the report may show a benign variant, a variant of uncertain significance, or a pathogenic variant.
When should I consider getting a genetic test?
Genetic testing for the KIF22 gene may be worth considering when a child or adult has an unexplained bone growth condition, especially short stature, very flexible or unstable joints, spine or hip changes on X-rays, or a family history of similar findings. A disease-causing KIF22 variant can help confirm the cause.
A genetic result is only one part of your health story
Genetic test findings can be informative, but what they reveal varies based on the condition and the kind of variant involved. Over time, body function is also shaped by factors such as lifestyle, environment, age, and medical history. For some conditions, particularly those influenced by many genes, genetic information offers context rather than certainty and is most useful when viewed alongside other parts of care. In other situations, a genetic result can provide a clear answer. In areas like medication response, genetic results can also help make sense of individual experiences.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body breaks down a drug, moves it into tissues, or responds to its effects. This helps explain why the same medication works well for one person, seems weaker for another, or causes more side effects in someone else. These differences are common and are one reason treatment response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines the way genetic differences shape a person’s response to medicines. By studying connections between genes and medications, it helps explain why the same treatment can affect people differently. With many drugs, genes influence either how strongly the medicine works or how the body handles it. This information can support more informed, more personalized treatment decisions. To explore this subject in greater detail, more information is available in the LearnHub.
Drugs influenced by the KIF22 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines. If you have side effects, poor symptom control, or questions about any treatment, talk with your doctor or pharmacist so they can review your medicines and overall health.