The IFT74 gene helps build and maintain cilia, the tiny hair-like structures that cells use to sense signals and move materials. If it does not work properly, cilia may not form or function as they should, which can lead to a ciliopathy, a group of inherited conditions that may affect growth, vision, the kidneys, and other organs. Differences in this gene can help explain why people with conditions linked to variants in the IFT74 gene can have a wide range of features, depending on the variant they carry.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions they can use to make molecules or direct processes in the body. Some genes carry the code for producing proteins, the working parts of cells. Others mainly help regulate when certain processes happen, where they happen, and how strongly they take place. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medications. To go deeper into this topic, you can read more in the LearnHub.
Overview
IFT74Gene function
What if the gene works
The IFT74 gene helps cells build and maintain cilia, the tiny hairlike structures that sense signals and move fluid. Its protein helps carry key building blocks to the cilia so they can grow and work properly.
Risk
What if the gene does not work
Biallelic variants in the IFT74 gene can cause Joubert syndrome, with low muscle tone, developmental delay, and eye movement or balance problems. Milder or more severe variants may affect age at onset and whether eye, kidney, or skeletal features appear.
Treatment
What does that mean for your treatment
No treatment or management approach is currently tailored to pathogenic variants in the IFT74 gene. Research is focused on how the IFT74 gene affects cilia, but this has not yet led to a gene-directed therapy.
Conditions associated with IFT74
Gene function
What if the gene works
Many cells use tiny hair-like structures called cilia to sense their surroundings and move fluid in a controlled way. The IFT74 gene supports the transport system that keeps these structures growing and working. Understanding how the IFT74 gene helps cilia work can make it easier to see how cells stay organized during everyday activity.
Through its protein, the IFT74 gene helps move materials from the base of a cilium to its tip, where growth happens. This steady delivery supports cilia assembly and routine renewal.
Inside cilia, the IFT74 gene is part of a larger transport team that carries proteins to the right place. That organized traffic helps cilia keep their shape and handle normal cell signaling.
One of the main jobs of the IFT74 gene is to help carry tubulin, the protein used to build a cilium's inner framework. It works closely with partner proteins so new framework pieces reach the growing tip.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can more significantly change how a gene functions and may contribute to or directly cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the IFT74 gene often change how stable the protein is or how well it joins the transport machinery inside tiny hairlike cell structures called cilia. The pattern of how IFT74 gene variants affect cilia depends on how much they alter the protein's shape, its binding to partner proteins, and its ability to move tubulin, a key cilia building block. Milder variants may leave some activity, while more severe variants can cause marked loss of function.
How variants are linked to conditions
Research on how variants in the IFT74 gene are linked to health conditions points mainly to rare inherited ciliopathies. Pathogenic variants in both copies of the IFT74 gene are linked to Bardet-Biedl syndrome, and some families with IFT74 variants have also been diagnosed with Joubert syndrome. These are very uncommon conditions, so IFT74 is not considered a common risk gene in the general population.
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 directly affect health and instead reflect normal human diversity. For many genes, carrying a variant associated with a condition points to a possible link rather than a definitive diagnosis, especially when several genes and environmental factors are involved. 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the IFT74 gene. For many living with an IFT74 gene change, risk is mainly shaped by the exact genetic change and whether one or both copies of the gene are affected.
Inheritance of IFT74 variants
IFT74-related conditions are inherited in an autosomal recessive pattern. In practical terms, this means a child usually inherits one altered copy of the IFT74 gene from each parent. When both parents carry one variant, each pregnancy has a 25% chance of the child inheriting both altered copies, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. This IFT74 inheritance pattern affects males and females equally because the gene is on an autosome rather than a sex chromosome.
What does my IFT74 result mean for my family?
For families with an IFT74-related condition, this is usually passed down in a recessive way, which means parents are often healthy carriers. Brothers and sisters may also be carriers or may have the condition, so close relatives may want to learn whether the same gene change is present in the family. For future children, the chance depends on whether both parents carry an IFT74 change.
Genetic information
Genetic testing
How you find out about variants
Testing for variants in the IFT74 gene usually uses a blood sample, saliva, or a cheek swab, with DNA read by sequencing. IFT74 genetic testing may be ordered as part of a targeted gene panel, exome, or genome test, and results can show whether a variant is found.
When should I consider getting a genetic test?
Genetic testing for the IFT74 gene may be considered when a child has signs of a rare inherited condition affecting tiny hair-like parts of cells, such as developmental delay, low muscle tone, unusual eye movements, breathing changes, or extra fingers or toes. It can also be helpful when there is a family history of Joubert syndrome.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and on the kind of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best viewed alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, these results can 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 genes can change how the body absorbs, breaks down, or responds to a drug, so the same treatment may work better for one person than for another. This is common and can influence how much benefit someone gets from a medicine or how likely they are to notice side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medications. It studies the relationship between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body processes it. This understanding can help guide treatment decisions that are better informed and more personalized. More detail on this topic is available in the LearnHub.
Drugs influenced by the IFT74 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so concerns about side effects, new symptoms after starting a medicine, or how your treatments fit with your overall health are best discussed with your doctor.