The PHF6 gene helps control which other genes turn on and off, especially during brain development and cell growth. If the PHF6 gene does not work properly, it can disrupt learning, speech, behavior, and physical development. In medicine, this gene is important because inherited pathogenic variants are linked to Börjeson-Forssman-Lehmann syndrome, an X-linked condition that often includes intellectual disability and characteristic facial features. Changes in PHF6 can also appear in some blood cancers.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells can use to make molecules or regulate processes in the body. Some genes hold the instructions for making proteins, which are the functional parts of cells. Other genes mainly help control when certain processes happen, where they occur, and how strongly they run. Taken together, genes influence how the body develops and functions, and they can shape how you respond to food, stress, or medications. To explore this topic in greater depth, you can learn more in the LearnHub.
Overview
PHF6Gene function
What if the gene works
The PHF6 gene helps cells control which genes are turned on or off. This supports normal growth, brain development, and steady cell division.
Risk
What if the gene does not work
Variants in the PHF6 gene can cause an X linked developmental condition with intellectual disability, delayed speech, and distinctive facial features. Effects can range from milder to more severe, which may influence when signs appear and how learning is affected.
Treatment
What does that mean for your treatment
No PHF6-specific treatment or drug selection approach is currently established in clinical guidelines for people with a pathogenic or loss-of-function variant in the PHF6 gene. In research settings, the PHF6 gene is being studied mainly as a cancer-related biomarker, especially in some leukemias, rather than as a target with a proven gene-directed therapy.
Conditions associated with PHF6
Gene function
What if the gene works
Inside your cells, the PHF6 gene helps manage routine jobs in the cell nucleus, where genetic instructions are used. It supports orderly gene activity and helps with making ribosomes, the cell’s protein building machines. This gives a practical picture of what the PHF6 gene does in cells each day.
The PHF6 gene helps cells turn selected genes on or off at the right time. This keeps cell instructions organized so everyday tasks can run in a controlled way.
Its protein works with proteins that package DNA inside the nucleus. This helps long DNA strands stay ordered and keeps important instructions available when cells need them.
The protein made from the PHF6 gene is active in the nucleolus, the part of the nucleus that helps build ribosomes. By supporting this process, it helps cells make proteins for growth, repair, and daily function.
By guiding gene use and ribosome production, the PHF6 gene supports normal cell growth and division. This helps cells follow a steady timetable as they carry out routine work.
What is a variant?
A genetic variant is a slight 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 the way the body responds to environmental influences. Many variants have no noticeable effect and simply reflect the natural range of genetic variation. In some cases, though, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the PHF6 gene can alter how much PHF6 protein cells make or how stable it is. More disruptive variants may shorten the protein or damage regions that help it attach to zinc and interact with other cell proteins, reducing control of gene activity. Milder variants may leave some function intact. This is how PHF6 gene variants affect function at the cell level, and the amount of function left can influence how strongly developmental features linked to PHF6 appear.
How variants are linked to conditions
Pathogenic variants in the PHF6 gene cause Börjeson-Forssman-Lehmann syndrome, a rare X-linked condition linked with developmental delay or intellectual disability and physical features that can vary from person to person. Some people with PHF6-related conditions, including many females, have a different pattern with learning difficulties, delayed development, or seizures rather than the classic syndrome. Acquired PHF6 variants are also seen in some blood cancers, especially a type called T-cell acute lymphoblastic leukemia.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and instead reflect natural human variation. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors play a role. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For PHF6, risk is mainly shaped by whether a disease-causing change is inherited or happens new in the family. Because PHF6 is on the X chromosome, the chance of being affected and how strongly it shows can differ between males and females. There is not enough evidence that lifestyle or environmental factors meaningfully change this genetic risk.
Inheritance of PHF6 variants
PHF6-related conditions follow an X-linked inheritance pattern, so the PHF6 inheritance pattern differs for sons and daughters. A mother carrying a PHF6 variant can pass it to either sex, while a father with a PHF6 variant passes it to all daughters and to none of his sons. In many families, males are more clearly affected, while females may have milder or variable features. Some people have a new de novo PHF6 variant that was not inherited from either parent.
What does my PHF6 result mean for my family?
PHF6-related conditions are usually passed down in an X-linked way, so family members on one side of the family may also carry the same gene change. If a mother carries the change, each child has a 50% chance of inheriting it; if a father carries it, all daughters and no sons would usually inherit it. Some PHF6 changes happen for the first time in one person, so a parent may not always have the same result.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the PHF6 gene, genetic testing usually analyzes DNA from a blood sample or saliva. PHF6 genetic testing may be done through a broader panel for developmental delay or intellectual disability, or through exome sequencing, which reads many genes at once. A lab checks the DNA sequence for variants and reports whether one is found.
When should I consider getting a genetic test?
If there are signs of a rare inherited condition linked to the PHF6 gene, such as developmental delay, learning problems, or a family history of similar features, genetic testing may help clarify the cause. It can also be considered when a doctor suspects Börjeson-Forssman-Lehmann syndrome.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it reveals depends on the condition and the type of variant. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best considered together with 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. This helps explain why the same treatment works well for one person, seems weaker in another, or causes more side effects in someone else. Part of the difference comes from how the body breaks down, moves, and responds to a drug, and inherited DNA changes can influence each of these steps. These differences are common and can shape how effective a medicine feels or how sensitive a person is to it.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences affect medication response. By examining links between genes and drugs, it helps clarify why treatments can work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body processes it. This information can help support more informed, individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the PHF6 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices or treatment decisions. Talk with your doctor or pharmacist about any symptoms, treatment concerns, or medicine side effects.
History
PHF6 entered medical genetics through studies of families affected by Börjeson-Forssman-Lehmann syndrome, a condition first described decades before the gene itself was identified. In 2002, researchers linked the PHF6 gene to this syndrome, giving families a clearer genetic explanation for a long-recognized pattern of developmental and physical features. Initially understood only through visible traits, later recognized as tied to a specific gene, the condition became easier to classify and study. From these first observations, research expanded steadily. Over time, PHF6 was also linked to other developmental conditions and to some blood cancers, which broadened medical interest in the gene. These historical steps shaped today’s understanding.