The HJURP gene helps cells place an essential protein at the centromere, the part of each chromosome that directs proper chromosome movement during cell division. If this gene does not work properly, cells can sort chromosomes the wrong way, which may interfere with normal growth and development. In medicine, this gene is important because rare variants that disrupt it have been linked to developmental conditions, and higher HJURP activity is also being studied in some cancers.
What is a gene?
Genes are sections of DNA that hold instructions cells use to make molecules or direct activities in the body. Some genes provide the instructions for building proteins, which are the active components inside cells. Others mostly regulate when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medicines. More detail on this topic is available in the LearnHub.
Overview
HJURPGene function
What if the gene works
The HJURP gene helps place a key protein at the centromere, the part of each chromosome that guides cell division. This supports accurate chromosome sorting when cells divide.
Risk
What if the gene does not work
More disruptive variants in the HJURP gene can impair chromosome handling during cell division, leading to growth restriction, small head size, developmental delay, and sometimes hearing loss. Milder variants may cause later or milder symptoms.
Treatment
What does that mean for your treatment
No HJURP-specific treatment or management approach is currently established in clinical guidelines for pathogenic or loss-of-function variants in the HJURP gene. In research, the HJURP gene is being studied mainly as a cancer biomarker and possible drug target because altered activity may be linked to tumor growth and treatment response.
Gene function
What if the gene works
Each time a cell divides, it has to sort its chromosomes with great accuracy. Understanding HJURP gene function helps explain how cells mark the exact spot where the division machinery can attach, so each new cell receives a full set of chromosomes.
HJURP places a special DNA packaging protein called CENP-A at the centromere, the chromosome region used during cell division. This creates a clear marker for where the cell should assemble its chromosome handling machinery.
By loading CENP-A in the right place, HJURP helps build the centromere platform that the cell’s pulling fibers use during division. This gives the cell a stable grip on each chromosome as it lines them up.
HJURP refreshes this chromosome marker after DNA has been copied, helping the same centromere site stay recognized from one cell cycle to the next. That steady marking supports accurate chromosome sharing over time.
What is a variant?
A genetic variant is a minor change in the DNA sequence of 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 have no noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can change 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 HJURP gene can change how well the HJURP protein folds, stays stable, and binds its partner proteins at the centromere, the chromosome region needed for accurate cell division. In this way, HJURP gene variants may reduce placement of key centromere proteins and increase chromosome sorting errors when cells divide. Milder variants can leave some activity in place, while more severe variants may greatly reduce or nearly abolish protein function.
How variants are linked to conditions
Research on variants in the HJURP gene and related health conditions is still developing. The HJURP gene does not yet have a broadly confirmed link to a specific condition, though this can change as research grows, so anyone with a confirmed HJURP-related diagnosis should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
Variants in genes are a usual part of human biology and are widely found across the general population. Most do not directly affect health and simply reflect natural variation among people. For many genes, having a variant connected with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one well understood variant in a particular 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 HJURP gene. For many living with a disease-causing HJURP change, the main factor is the genetic change itself, rather than lifestyle or environmental exposures.
Inheritance of HJURP variants
HJURP-related conditions are inherited in an autosomal recessive pattern. This means a person usually inherits one HJURP gene variant from each parent, and both copies need to carry a disease-causing variant for the condition to occur. Parents who each carry one variant are typically unaffected carriers, and with each pregnancy there is a 25% chance of having an affected child, a 50% chance of having a carrier child, and a 25% chance of having a child without the familial variants. In practical terms, how HJURP gene variants are inherited often means the condition can appear in one child even when parents are healthy.
What does my HJURP result mean for my family?
For families with a disease-causing HJURP result linked to the recognized HJURP-related condition, the pattern is usually recessive, which means parents are often healthy carriers and brothers or sisters may also be carriers or, less often, have the condition. Other close relatives may also carry the same gene change. Family meaning depends on the exact result, but carrier testing can be relevant for relatives in some families.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant, HJURP genetic testing reads the DNA sequence of the HJURP gene from a blood or saliva sample. The lab compares your result with the usual sequence and reports whether a variant was found, often as part of a multigene panel or broader sequencing test.
When should I consider getting a genetic test?
Genetic testing for the HJURP gene may be considered when a child has unexplained very small head size, developmental delay, or poor growth, especially if similar findings run in the family. It can also be relevant as part of a broader genetic test looking for the cause of these features.
A genetic result is only one part of your health story
A genetic test result can be informative, but how much it explains varies based on the condition and the specific variant. Over time, many factors also influence how the body functions, including lifestyle, environment, age, and medical history. In 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 give a clear answer. In areas like medication response, genetic information can also help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment can work well for one person, have less effect for another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect the way people respond to medications. It looks at connections 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 how strong a drug’s effects are or how the body handles it. This information can support treatment decisions that are more informed and more personalized. More details on this topic are available in the LearnHub.
Drugs influenced by the HJURP gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used. If you have concerns about side effects, how well a treatment is working, or how different medicines may affect you, talk with your doctor or pharmacist.