If you carry changes in the IFITM5 gene, the main effect is usually on bone strength and shaping. This gene plays an important role in how bone forming cells build and harden bone. Certain pathogenic variants can cause a form of osteogenesis imperfecta, often leading to frequent fractures, extra bone growth after injury, and stiffness or limited turning of the forearm. Features can vary from person to person.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or manage processes in the body. Some genes give the directions for producing proteins, the cell parts that do much of the work. Other genes are used mostly to control the timing, place, and strength of certain processes. In combination, genes affect how the body develops and works, and they can also influence how you react to food, stress, and medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
IFITM5Gene function
What if the gene works
The IFITM5 gene is active mainly in cells that build bone. It helps bones harden normally and supports their strength and structure.
Risk
What if the gene does not work
Variants in the IFITM5 gene can cause osteogenesis imperfecta, usually type V. Common features include fragile bones, repeated fractures, and extra bone formation after injury or between forearm bones. Milder and more severe variants can change onset and severity.
Treatment
What does that mean for your treatment
No IFITM5-specific treatment or drug-selection approach is currently established in clinical guidelines. Care usually follows standard management for the person’s bone condition rather than a gene-directed therapy plan.
Conditions associated with IFITM5
Gene function
What if the gene works
Bones need a steady balance of building and hardening to stay strong. The IFITM5 gene is most active in osteoblasts, the cells that make new bone. It supports normal bone formation from early development through ongoing bone renewal. Understanding how the IFITM5 gene helps build bone makes its role in everyday skeletal health easier to picture.
The IFITM5 gene is active mainly in osteoblasts, the cells that make new bone. It supports their normal work as they lay down the framework that later becomes hardened bone.
IFITM5 helps new bone tissue mineralize, which means it takes up minerals such as calcium and phosphate. This turns softer early bone material into firmer, more supportive bone.
This gene contributes to the normal formation and renewal of the skeleton over time. It helps bone-forming cells coordinate steady bone growth and maintenance throughout life.
What is a variant?
A genetic variant is a slight change in the DNA sequence of a gene. These changes are common and help shape normal human differences, such as appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant can more substantially change how a gene functions and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IFITM5 gene can change how the protein is made or how it interacts with bone cells. The best known change, c.-14C>T, adds five extra amino acids to the start of the protein, which appears to alter cell signaling rather than switch the gene off. IFITM5 gene variant effects range from this altered protein to rarer changes that may reduce protein stability, and these differences can influence how early osteogenesis imperfecta features appear and how marked they are.
How variants are linked to conditions
A disease-causing variant in the IFITM5 gene causes osteogenesis imperfecta type V, a form of brittle bone disease. In studies on IFITM5 gene changes linked to osteogenesis imperfecta type V, people may have repeated fractures, bone deformity, and extra bone formation around the forearm. A few other rare variants in the IFITM5 gene have also been associated with atypical forms of osteogenesis imperfecta.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common throughout the general population. Most do not have a direct impact 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 definite diagnosis, especially when multiple genes and environmental factors also play a part. 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 IFITM5, the main risk is carrying a disease-causing gene change, usually inherited from a parent or arising new in the child, so day-to-day habits are not known to prevent the condition itself. There is not enough evidence to say lifestyle changes lower the chance of having IFITM5-related bone fragility, but avoiding high-impact injuries and getting regular bone care can help reduce complications.
Inheritance of IFITM5 variants
IFITM5-related conditions are inherited in an autosomal dominant pattern. This means a parent carrying a disease-causing variant in the IFITM5 gene can pass it on to each child with a 50% chance in each pregnancy, regardless of sex. In some families, the inheritance of IFITM5 gene variants starts with a new (de novo) variant in the affected person, meaning it was not inherited from either parent. Once present, that variant can be passed from parent to child in the same autosomal dominant way.
What does my IFITM5 result mean for my family?
Changes in the IFITM5 gene linked to brittle bone disease can be passed down in a dominant pattern, so close relatives such as a parent, brother, sister, or child may also carry the same change. A child of someone with the variant can inherit it. Some IFITM5 changes happen for the first time in one person, so a parent does not always have to carry it for it to appear in a family.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the IFITM5 gene, doctors use genetic testing for IFITM5 variants, usually on a blood or saliva sample. A lab reads the DNA sequence and checks for known changes. Results can confirm whether an IFITM5 variant is present.
When should I consider getting a genetic test?
Consider IFITM5 testing if someone has repeated broken bones from minor falls, especially along with a family history of brittle bones. It can also help explain certain forms of osteogenesis imperfecta, a condition that makes bones break easily, and may clarify the diagnosis for a child or adult with these signs.
A genetic result is only one part of your health story
A genetic result can provide useful insight, though how much it reveals depends on the condition and on the kind of variant present. Over time, the way the body functions is shaped by many factors, including lifestyle, environment, age, and medical history. With some conditions, particularly ones affected by many genes, genetic information offers context rather than certainty and is most helpful when considered together with other parts of care. In other situations, a genetic result may give a clear answer. In areas such as medication response, genetic results can also help put individual experiences in perspective.
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 through the body, or responds to its effects. This is common and helps explain why the same treatment works well for one person, seems weaker for another, or causes more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can affect the way a person responds to medication. It focuses on gene and drug patterns to help explain why the same treatment may work differently in different people. With many medicines, genes can influence how powerfully a drug works or how the body handles it. Understanding this can support treatment choices that are more informed and more individualized. More information on this topic is available in the LearnHub.
Drugs influenced by the IFITM5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines, so any concerns about side effects, new symptoms, or treatment choices are best discussed with your doctor or pharmacist.
History
In recent decades, awareness of the IFITM5 gene’s role has grown through research on inherited bone conditions. A major step came in 2012, when scientists linked a recurrent change in the IFITM5 gene, c.-14C>T, to osteogenesis imperfecta type V, a form of brittle bone disease with distinctive features. This finding helped explain why some families had a pattern that looked different from other types of osteogenesis imperfecta. From these first observations, research expanded steadily, and the IFITM5 gene became an important part of classifying this condition more accurately. Scientific classifications changed as researchers learned more about the gene. Today, its history is closely tied to the effort to separate similar bone conditions into clearer, more precise diagnoses.