HPF1 helps your cells repair damage to DNA, the instruction code inside every cell. This gene plays an important role in helping repair proteins fix that damage in the right way. If both copies of the HPF1 gene do not work properly, the body may have trouble protecting brain cells, which can lead to a rare inherited condition with developmental delay, intellectual disability, low muscle tone, seizures, or movement problems. HPF1 is mainly known in medical genetics rather than in popular culture.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions for making molecules or directing processes in the body. Some genes carry the information needed to make proteins, the cell parts that do much of the work. Other genes mainly control when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
HPF1Gene function
What if the gene works
The HPF1 gene helps cells respond to DNA damage. Its protein works with PARP proteins to place repair marks on proteins, which supports timely DNA repair and cell survival.
Risk
What if the gene does not work
More severe variants in the HPF1 gene can cause a rare neurodevelopmental condition with developmental delay, low muscle tone, and seizures. Symptoms often begin in infancy, while milder variants may cause a different mix and degree of features.
Treatment
What does that mean for your treatment
No treatment or drug choice guidance specific to a pathogenic variant in the HPF1 gene is currently established in clinical guidelines. In research, the HPF1 gene is being studied in cancer biology because loss of HPF1 can change how cells respond to PARP inhibitors, but this has not become routine treatment guidance.
Gene function
What if the gene works
Your cells constantly tidy up small DNA injuries that happen during everyday life. The HPF1 gene supports this early repair response by guiding an important protein tagging signal at damaged DNA. Understanding how the HPF1 gene helps repair damaged DNA makes it easier to see how cells protect their genetic instructions over time.
The HPF1 gene makes a protein that teams up with PARP1 and PARP2, two proteins that sense DNA damage. Together, they help launch one of the cell’s earliest repair signals.
HPF1 helps place ADP-ribose tags (small chemical signals) onto histones, the proteins that package DNA, and onto nearby repair proteins. These tags mark the area so other repair helpers can gather where they are needed.
By guiding signals onto histones, the HPF1 gene helps loosen DNA packaging for a short time around damaged spots. This gives repair tools better access while the cell preserves the overall organization of its DNA.
HPF1 helps direct this tagging response to the right proteins at the right place. That keeps early DNA repair organized and matched to the cell’s immediate needs.
What is a variant?
A genetic variant is a small difference 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 situations, however, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the HPF1 gene can affect protein function by making the HPF1 protein unstable, shortening it, or weakening its binding to PARP1 and PARP2, two partners needed to place repair tags on damaged DNA and nearby proteins. Some changes leave partial activity, while more disruptive variants cause a clearer loss of function. In people with HPF1-related disease, greater loss of function may be linked to earlier and more pronounced features.
How variants are linked to conditions
Current evidence on health conditions linked to HPF1 gene variants points mainly to a rare inherited neurodevelopmental condition. Pathogenic variants in both copies of the HPF1 gene can cause developmental delay, low muscle tone, movement or balance problems, unusual eye movements, and sometimes seizures. Doctors confirm the diagnosis by matching the gene finding with a person's symptoms.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common throughout the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant connected with a condition indicates a possible association rather than a definite diagnosis, especially when multiple genes and environmental factors also contribute. In some cases, 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the HPF1 gene. For many living with an HPF1 change, risk is mostly tied to the specific genetic change itself rather than clear lifestyle or environmental factors, and a doctor or genetic counselor can help explain personal risk.
Inheritance of HPF1 variants
The HPF1 inheritance pattern described for HPF1-related disease is autosomal recessive. This means a person usually inherits one altered copy of the HPF1 gene from each parent. Parents who each carry one HPF1 variant typically do not have the condition themselves, but with each pregnancy there is a 25% chance the child inherits both altered copies, a 50% chance the child is a carrier, and a 25% chance the child inherits two working copies. Sons and daughters are affected at the same rate.
What does my HPF1 result mean for my family?
Changes in the HPF1 gene are linked to a rare inherited condition that follows a recessive pattern, which means close relatives may also carry the same gene change without having symptoms. Brothers and sisters could be affected or be carriers, and parents are usually carriers. Other family members may also carry the change, especially on the same side of the family.
Genetic information
Genetic testing
How you find out about variants
HPF1 variants are found with genetic testing for HPF1 variants, usually using a blood sample or saliva sample. A lab reads the DNA code in the HPF1 gene and looks for changes linked to a person’s symptoms or family history. Results may show a known variant, no relevant variant, or a change whose meaning is still unclear.
When should I consider getting a genetic test?
Testing for the HPF1 gene may be considered when a child has unexplained developmental delay or intellectual disability, low muscle tone, movement problems, or seizures, especially if similar problems run in the family. It can help confirm whether an HPF1 change is the cause.
A genetic result is only one part of your health story
Genetic test results can provide meaningful insight, although how much they explain varies based on the condition and the kind of variant involved. How the body works over time is also shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside 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 personal 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 breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same treatment works well for one person, works less well for another, or causes more side effects in some people. These differences are common and are one reason medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can affect the way a person responds to medication. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strong the drug’s effects are and how the body processes it. This information can help support treatment decisions that are more informed and tailored to the individual. More details on this topic are available in the LearnHub.
Drugs influenced by the HPF1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so general questions about medicines, side effects, or your treatment plan are best discussed with your doctor. HPF1 is being studied in cancer research because it may affect how cells respond to PARP inhibitor medicines and some DNA-damaging treatments, but this is not yet used routinely in everyday care.
History
The HPF1 gene entered the scientific literature relatively recently, during intensive work to better understand PARP biology in the mid 2010s. Building on this early work, scientists identified HPF1 as a key piece of a puzzle that had limited earlier PARP research. Its discovery quickly drew attention in cancer and DNA repair studies, especially as PARP inhibitors were becoming more important in medicine. Over time, descriptions became more precise as laboratory and structural studies showed how the HPF1 gene fits into this research area. Today, the HPF1 gene is best known as part of the modern history of PARP science, where a newer finding helped reshape an established field.